start day 3

2022/day_01/solution.test.ts

@@ -1,27 +1,28 @@
-import { readlines } from "../_utils";
+import path from "path";
+import { readlines } from "../../_utils";
 
 const solution = require("./solution");
 
 describe("day 1: calorie counting, pt 1", () => {
   test("sample input", async () => {
-    const sample = await readlines("./day_01/sample.txt");
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
     expect(solution.part1_solver(sample)).toBe(24000);
   });
 
   test("submission input", async () => {
-    const input = await readlines("./day_01/input.txt");
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
     expect(solution.part1_solver(input)).toBe(70613);
   });
 });
 
 describe("day 1: calorie counting, pt 2", () => {
   test("sample input", async () => {
-    const sample = await readlines("./day_01/sample.txt");
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
     expect(solution.part2_solver(sample)).toBe(45000);
   });
 
   test("submission input", async () => {
-    const input = await readlines("./day_01/input.txt");
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
     expect(solution.part2_solver(input)).toBe(205805);
   });
 });

2022/day_01/solution.ts

@@ -43,7 +43,7 @@ In case the Elves get hungry and need extra snacks, they need to know which Elf
 Find the Elf carrying the most Calories. How many total Calories is that Elf carrying?
 */
 
-import { group, sum } from "../_utils";
+import { group, sum } from "../../_utils";
 
 const groupSnacksByElf = (lines: string[]): string[][] =>
   group(lines, (_, line) => line === "", false);

2022/day_02/solution.test.ts

@@ -1,27 +1,28 @@
-import { readlines } from "../_utils";
+import path from "path";
+import { readlines } from "../../_utils";
 
 const solution = require("./solution");
 
 describe("day 2: rock paper scissors, pt 1", () => {
   test("sample input", async () => {
-    const sample = await readlines("./day_02/sample.txt");
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
     expect(solution.part1_solver(sample)).toBe(15);
   });
 
   test("submission input", async () => {
-    const input = await readlines("./day_02/input.txt");
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
     expect(solution.part1_solver(input)).toBe(13675);
   });
 });
 
 describe("day 2: rock paper scissors, pt 2", () => {
   test("sample input", async () => {
-    const sample = await readlines("./day_02/sample.txt");
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
     expect(solution.part2_solver(sample)).toBe(12);
   });
 
   test("submission input", async () => {
-    const input = await readlines("./day_02/input.txt");
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
     expect(solution.part2_solver(input)).toBe(14184);
   });
 });

2022/day_02/solution.ts

@@ -30,7 +30,7 @@ In this example, if you were to follow the strategy guide, you would get a total
 What would your total score be if everything goes exactly according to your strategy guide?
 */
 
-import { emptyLines, sum } from "../_utils";
+import { emptyLines, sum } from "../../_utils";
 
 export function part1_solver(lines: string[]): number {
   const score_map = {

2022/day_03/solution.test.ts

@@ -1,27 +1,28 @@
-import { readlines } from "../_utils";
+import path from "path";
+import { readlines } from "../../_utils";
 
 const solution = require("./solution");
 
 describe("day 3: rucksack reorganization, pt 1", () => {
   test("sample input", async () => {
-    const sample = await readlines("./day_03/sample.txt");
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
     expect(solution.part1_solver(sample)).toBe(157);
   });
 
   test("submission input", async () => {
-    const input = await readlines("./day_03/input.txt");
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
     expect(solution.part1_solver(input)).toBe(8109);
   });
 });
 
 describe("day 3: rucksack reorganization, pt 2", () => {
   test("sample input", async () => {
-    const sample = await readlines("./day_03/sample.txt");
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
     expect(solution.part2_solver(sample)).toBe(70);
   });
 
   test("submission input", async () => {
-    const input = await readlines("./day_03/input.txt");
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
     expect(solution.part2_solver(input)).toBe(2738);
   });
 });

2022/day_03/solution.ts

@@ -35,7 +35,7 @@ In the above example, the priority of the item type that appears in both compart
 Find the item type that appears in both compartments of each rucksack. What is the sum of the priorities of those item types?
 */
 
-import { emptyLines, group, sum } from "../_utils";
+import { emptyLines, group, sum } from "../../_utils";
 
 /**
  *

2022/day_04/sample.txt

@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8

2022/day_04/solution.test.ts

@@ -0,0 +1,28 @@
+import path from "path";
+import { readlines } from "../../_utils";
+
+const solution = require("./solution");
+
+describe("day 4: camp cleanup, pt 1", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(solution.part1_solver(sample)).toBe(2);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(solution.part1_solver(input)).toBe(450);
+  });
+});
+
+describe("day 4: camp cleanup, pt 2", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(solution.part2_solver(sample)).toBe(4);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(solution.part2_solver(input)).toBe(837);
+  });
+});

2022/day_04/solution.ts

@@ -0,0 +1,121 @@
+/*
+--- Day 4: Camp Cleanup ---
+
+Space needs to be cleared before the last supplies can be unloaded from the ships, and so several Elves have been assigned the job of cleaning up sections of the camp. Every section has a unique ID number, and each Elf is assigned a range of section IDs.
+
+However, as some of the Elves compare their section assignments with each other, they've noticed that many of the assignments overlap. To try to quickly find overlaps and reduce duplicated effort, the Elves pair up and make a big list of the section assignments for each pair (your puzzle input).
+
+For example, consider the following list of section assignment pairs:
+
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8
+
+For the first few pairs, this list means:
+
+    Within the first pair of Elves, the first Elf was assigned sections 2-4 (sections 2, 3, and 4), while the second Elf was assigned sections 6-8 (sections 6, 7, 8).
+    The Elves in the second pair were each assigned two sections.
+    The Elves in the third pair were each assigned three sections: one got sections 5, 6, and 7, while the other also got 7, plus 8 and 9.
+
+This example list uses single-digit section IDs to make it easier to draw; your actual list might contain larger numbers. Visually, these pairs of section assignments look like this:
+
+.234.....  2-4
+.....678.  6-8
+
+.23......  2-3
+...45....  4-5
+
+....567..  5-7
+......789  7-9
+
+.2345678.  2-8
+..34567..  3-7
+
+.....6...  6-6
+...456...  4-6
+
+.23456...  2-6
+...45678.  4-8
+
+Some of the pairs have noticed that one of their assignments fully contains the other. For example, 2-8 fully contains 3-7, and 6-6 is fully contained by 4-6. In pairs where one assignment fully contains the other, one Elf in the pair would be exclusively cleaning sections their partner will already be cleaning, so these seem like the most in need of reconsideration. In this example, there are 2 such pairs.
+
+In how many assignment pairs does one range fully contain the other?
+*/
+
+import { emptyLines, sum } from "../../_utils";
+
+class Range {
+  min: number;
+  max: number;
+  size: number;
+
+  constructor(range: string) {
+    const [min, max] = range.split("-").map((n) => parseInt(n));
+
+    this.min = min;
+    this.max = max;
+    this.size = max - min + 1;
+  }
+
+  /**
+   * Determines whether other range is fully contained by (or fully contains) `this` range
+   * @param r
+   * @returns
+   */
+  contains(r: Range): boolean {
+    const [larger, smaller] = r.size > this.size ? [r, this] : [this, r];
+    return smaller.min >= larger.min && smaller.max <= larger.max;
+  }
+
+  /**
+   * Determines whether other range partially overlaps `this` range
+   * @param r
+   */
+  overlaps(r: Range): boolean {
+    const [sooner, later] = r.min < this.min ? [r, this] : [this, r];
+    return later.min <= sooner.max;
+  }
+}
+
+const toRanges = (line: string): Range[] =>
+  line.split(",").map((r) => new Range(r));
+
+const toOneOrZero = (b: boolean) => (b ? 1 : 0);
+
+export function part1_solver(lines: string[]): number {
+  return lines
+    .filter(emptyLines)
+    .map(toRanges)
+    .map(([elf1Range, elf2Range]) => elf1Range.contains(elf2Range))
+    .map(toOneOrZero) // convert boolean to number for counting
+    .reduce(sum, 0);
+}
+
+/*
+--- Part Two ---
+
+It seems like there is still quite a bit of duplicate work planned. Instead, the Elves would like to know the number of pairs that overlap at all.
+
+In the above example, the first two pairs (2-4,6-8 and 2-3,4-5) don't overlap, while the remaining four pairs (5-7,7-9, 2-8,3-7, 6-6,4-6, and 2-6,4-8) do overlap:
+
+    5-7,7-9 overlaps in a single section, 7.
+    2-8,3-7 overlaps all of the sections 3 through 7.
+    6-6,4-6 overlaps in a single section, 6.
+    2-6,4-8 overlaps in sections 4, 5, and 6.
+
+So, in this example, the number of overlapping assignment pairs is 4.
+
+In how many assignment pairs do the ranges overlap?
+*/
+
+export function part2_solver(lines: string[]): number {
+  return lines
+    .filter(emptyLines)
+    .map(toRanges)
+    .map(([elf1Range, elf2Range]) => elf1Range.overlaps(elf2Range))
+    .map(toOneOrZero)
+    .reduce(sum, 0);
+}

2023/day_01/sample.txt

@@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet

2023/day_01/sample2.txt

@@ -0,0 +1,7 @@
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen

2023/day_01/solution.test.ts

@@ -0,0 +1,28 @@
+import path from "path";
+
+import { readlines } from "../../_utils";
+import { part1_solver, part2_solver } from "./solution";
+
+describe("day 1: trebuchet, pt 1", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part1_solver(sample)).toBe(142);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part1_solver(input)).toBe(55090);
+  });
+});
+
+describe("day 1: trebuchet, pt 2", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample2.txt"));
+    expect(part2_solver(sample)).toBe(281);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part2_solver(input)).toBe(54845);
+  });
+});

2023/day_01/solution.ts

@@ -0,0 +1,117 @@
+/*
+--- Day 1: Trebuchet?! ---
+
+Something is wrong with global snow production, and you've been selected to take a look. The Elves have even given you a map; on it, they've used stars to mark the top fifty locations that are likely to be having problems.
+
+You've been doing this long enough to know that to restore snow operations, you need to check all fifty stars by December 25th.
+
+Collect stars by solving puzzles. Two puzzles will be made available on each day in the Advent calendar; the second puzzle is unlocked when you complete the first. Each puzzle grants one star. Good luck!
+
+You try to ask why they can't just use a weather machine ("not powerful enough") and where they're even sending you ("the sky") and why your map looks mostly blank ("you sure ask a lot of questions") and hang on did you just say the sky ("of course, where do you think snow comes from") when you realize that the Elves are already loading you into a trebuchet ("please hold still, we need to strap you in").
+
+As they're making the final adjustments, they discover that their calibration document (your puzzle input) has been amended by a very young Elf who was apparently just excited to show off her art skills. Consequently, the Elves are having trouble reading the values on the document.
+
+The newly-improved calibration document consists of lines of text; each line originally contained a specific calibration value that the Elves now need to recover. On each line, the calibration value can be found by combining the first digit and the last digit (in that order) to form a single two-digit number.
+
+For example:
+
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet
+
+In this example, the calibration values of these four lines are 12, 38, 15, and 77. Adding these together produces 142.
+
+Consider your entire calibration document. What is the sum of all of the calibration values?
+*/
+
+import { sum, allIndicesOf } from "../../_utils";
+
+const extractDigits = (s: string): string => s.replaceAll(/[a-zA-Z]/g, "");
+const firstLast = (s: string): number => +`${s[0]}${s[s.length - 1]}`;
+
+export function part1_solver(lines: string[]): number {
+  return lines
+    .map(extractDigits)
+    .map(firstLast)
+    .filter((x) => !isNaN(x))
+    .reduce(sum, 0);
+}
+
+/*
+--- Part Two ---
+
+Your calculation isn't quite right. It looks like some of the digits are actually spelled out with letters: one, two, three, four, five, six, seven, eight, and nine also count as valid "digits".
+
+Equipped with this new information, you now need to find the real first and last digit on each line. For example:
+
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen
+
+In this example, the calibration values are 29, 83, 13, 24, 42, 14, and 76. Adding these together produces 281.
+
+What is the sum of all of the calibration values?
+*/
+
+const digits = [
+  "one",
+  "two",
+  "three",
+  "four",
+  "five",
+  "six",
+  "seven",
+  "eight",
+  "nine",
+];
+
+type Match = {
+  digitNum: number;
+  startPos: number;
+};
+
+const wordsToDigits = (s: string): string => {
+  let res = "";
+
+  // Find the starting indices of all word numbers in the string
+  const matches: Match[] = digits.reduce((indices, digitStr, i) => {
+    const digitNum = i + 1;
+    const matchedIndices = allIndicesOf(s, digitStr);
+
+    return [
+      ...indices,
+      ...matchedIndices.map((startPos) => ({ digitNum, startPos })),
+    ];
+  }, [] as Match[]);
+
+  // Sort the starting indices so we process the matches in order
+  matches.sort((a, b) => a.startPos - b.startPos);
+
+  // For each match...
+  //    1. Append the characters between the last match to the current match, unmodified.
+  //    2. Append the numerical value of the digit string to the result.
+  //    3. Update the last match value for the next iteration.
+  let lastmatch = 0;
+  matches.forEach((match) => {
+    res = res + s.slice(lastmatch, match.startPos);
+    res = res + match.digitNum;
+    lastmatch = match.startPos + digits[match.digitNum - 1].length;
+  });
+
+  // In case there are no more matches, but the string contains more random characters...
+  //  append the rest of them to the result.
+  if (lastmatch < s.length) {
+    res = res + s.slice(lastmatch, s.length);
+  }
+
+  return res;
+};
+
+export function part2_solver(lines: string[]): number {
+  return part1_solver(lines.map(wordsToDigits));
+}

2023/day_02/input.txt

@@ -0,0 +1,100 @@
+Game 1: 6 green, 3 blue; 3 red, 1 green; 4 green, 3 red, 5 blue
+Game 2: 2 red, 7 green; 13 green, 2 blue, 4 red; 4 green, 5 red, 1 blue; 1 blue, 9 red, 1 green
+Game 3: 2 green, 3 blue, 9 red; 3 red, 2 green; 6 red, 4 blue; 6 red
+Game 4: 9 red, 3 green; 3 green, 8 red, 6 blue; 12 blue, 4 green, 6 red; 4 green, 18 blue, 11 red; 9 blue, 2 green, 3 red; 14 blue, 7 red
+Game 5: 1 blue, 2 green, 3 red; 16 red, 6 green; 6 green, 2 red; 9 red, 1 green
+Game 6: 4 green, 7 red, 1 blue; 18 green, 6 blue, 7 red; 1 blue, 3 red, 9 green; 9 red, 19 green, 1 blue; 7 red, 9 green, 4 blue; 5 red, 5 blue, 10 green
+Game 7: 16 blue, 5 green, 6 red; 1 blue, 6 red, 9 green; 6 green, 3 red, 2 blue; 2 red, 12 blue, 2 green
+Game 8: 6 green, 10 red; 7 red, 6 green, 17 blue; 13 blue, 1 red
+Game 9: 2 red, 4 green, 5 blue; 2 green, 5 blue; 4 green, 1 blue; 3 green, 3 red, 6 blue; 3 green
+Game 10: 3 green, 5 red, 6 blue; 4 blue, 4 red, 5 green; 5 green, 9 red, 5 blue; 4 green, 6 blue, 10 red
+Game 11: 1 blue, 7 red, 9 green; 1 blue, 13 red, 7 green; 5 red; 4 red, 7 green, 2 blue; 7 green, 12 red; 13 red, 2 blue, 12 green
+Game 12: 4 blue, 2 red; 9 blue, 2 green, 3 red; 8 blue, 1 green, 1 red; 2 red, 3 green, 11 blue
+Game 13: 6 red, 8 green, 2 blue; 6 red, 7 green; 3 green, 3 red; 2 blue; 3 red, 5 green
+Game 14: 2 green, 11 blue, 1 red; 5 blue, 1 red, 1 green; 3 green, 12 blue, 2 red
+Game 15: 4 blue, 6 red, 7 green; 1 red, 2 blue, 5 green; 6 red, 3 green, 8 blue; 7 green, 8 blue, 4 red
+Game 16: 2 red, 16 blue; 2 green, 7 red; 15 blue, 7 red; 2 red, 3 green, 3 blue; 3 red, 1 green, 4 blue; 4 blue, 3 green
+Game 17: 2 red, 3 green, 10 blue; 9 red, 4 blue, 3 green; 3 green, 11 red, 6 blue
+Game 18: 1 red; 6 green, 1 red, 9 blue; 4 blue, 2 green; 6 blue, 10 green
+Game 19: 2 red, 9 green; 2 red, 1 blue; 5 blue, 12 green; 5 green; 8 green, 2 red, 3 blue; 1 red, 11 green
+Game 20: 3 green, 2 red, 7 blue; 1 blue, 10 green; 1 red, 14 blue, 13 green; 3 green, 19 blue, 4 red
+Game 21: 8 red, 10 blue, 8 green; 2 red, 7 green, 18 blue; 4 green, 11 blue, 4 red; 5 green, 3 blue, 10 red
+Game 22: 17 blue, 2 green, 2 red; 8 red, 7 blue; 1 red, 9 blue, 1 green
+Game 23: 4 blue, 18 red, 4 green; 3 blue, 7 red; 11 red; 3 blue, 6 red; 19 red
+Game 24: 10 red, 1 blue, 17 green; 17 green, 6 red; 14 green, 4 blue
+Game 25: 4 blue, 9 green, 4 red; 3 green, 5 blue; 5 blue, 8 green; 3 green, 3 blue, 1 red; 10 green, 1 blue, 4 red; 2 green, 2 blue, 1 red
+Game 26: 18 green, 3 red, 12 blue; 2 red, 7 green; 11 blue, 17 green; 12 green, 11 blue; 12 green, 4 blue, 3 red
+Game 27: 1 red, 3 blue, 8 green; 15 blue, 8 red, 4 green; 6 red, 9 blue; 6 red, 12 blue, 9 green; 4 red, 7 blue, 15 green
+Game 28: 1 red, 14 green; 1 blue, 11 green; 2 green; 4 red, 6 green, 1 blue
+Game 29: 1 green, 13 red; 4 red, 16 green, 7 blue; 2 red, 4 blue; 12 green, 8 blue, 4 red; 2 red; 12 red, 5 green
+Game 30: 3 green, 4 blue, 3 red; 5 blue, 4 green, 7 red; 5 blue, 2 green, 2 red; 3 red, 1 blue
+Game 31: 1 blue, 8 green; 9 green, 2 blue, 1 red; 1 red, 2 blue
+Game 32: 11 red, 5 green, 4 blue; 3 blue, 11 red, 8 green; 6 blue, 3 green, 17 red; 4 red, 7 green, 10 blue
+Game 33: 6 blue, 4 red; 1 green; 1 green, 4 red, 4 blue; 1 green, 3 red, 10 blue; 10 blue, 1 red
+Game 34: 2 green, 3 blue, 3 red; 4 red; 2 red, 2 blue
+Game 35: 9 green, 13 blue; 13 blue, 14 red, 1 green; 11 blue, 4 red, 7 green; 5 blue, 5 red, 8 green; 4 red, 2 blue, 2 green
+Game 36: 9 red, 5 blue, 8 green; 7 red, 20 blue; 6 green, 16 blue, 5 red; 12 red, 3 blue, 3 green; 3 green, 6 blue, 11 red; 11 red, 8 blue, 3 green
+Game 37: 10 green, 11 red, 3 blue; 2 blue, 6 green, 11 red; 9 green, 8 red, 2 blue
+Game 38: 2 red, 2 green, 4 blue; 3 red, 4 green, 3 blue; 8 green, 1 blue, 1 red; 3 red, 5 blue, 5 green
+Game 39: 3 green, 17 red, 4 blue; 2 green, 20 red; 4 blue, 4 red, 5 green; 5 blue, 7 green, 7 red; 4 blue, 5 green, 16 red
+Game 40: 2 green, 2 blue, 4 red; 3 blue, 16 green; 1 green, 2 blue; 1 red; 3 blue, 15 green; 13 green, 1 red, 2 blue
+Game 41: 12 red, 10 blue, 9 green; 1 green, 15 red, 4 blue; 2 green, 8 blue, 12 red; 3 red, 4 green, 2 blue; 8 blue, 14 red, 10 green; 9 blue, 7 green, 6 red
+Game 42: 5 red, 3 green, 6 blue; 4 blue, 6 green, 2 red; 10 blue; 3 red, 6 green, 10 blue
+Game 43: 9 blue, 7 green, 1 red; 2 green, 2 red, 8 blue; 3 red, 15 blue, 11 green; 1 red, 6 blue, 1 green; 2 red, 1 blue; 1 red, 3 green, 7 blue
+Game 44: 4 green, 6 red; 15 green, 6 red; 9 green, 16 red, 7 blue; 11 green, 4 blue, 12 red
+Game 45: 3 blue, 6 green, 1 red; 4 green, 3 blue; 8 green, 3 blue
+Game 46: 10 red, 8 blue; 12 red, 2 green, 17 blue; 17 blue, 6 red, 1 green; 18 red, 6 green, 3 blue; 16 blue, 2 green, 3 red
+Game 47: 8 green, 13 red; 8 green, 8 red, 4 blue; 10 red, 3 green; 14 red, 5 green, 8 blue; 7 green, 19 red, 3 blue; 2 red, 5 green, 5 blue
+Game 48: 7 green, 9 blue, 3 red; 7 blue, 1 green, 9 red; 7 green, 4 red, 1 blue; 6 green, 3 red, 1 blue
+Game 49: 2 red, 3 green; 3 blue, 2 red; 4 red, 3 blue
+Game 50: 3 red, 7 blue, 4 green; 2 green, 1 blue, 7 red; 4 red, 1 green, 5 blue
+Game 51: 11 red, 6 green, 1 blue; 7 red, 1 blue, 9 green; 15 red, 18 green; 11 green, 1 blue, 11 red; 10 green, 14 red; 1 red, 11 green, 1 blue
+Game 52: 18 blue, 1 red, 2 green; 18 blue, 3 green, 1 red; 2 green, 13 blue, 1 red
+Game 53: 2 blue, 9 red, 6 green; 1 blue, 3 red; 7 red, 6 blue, 8 green; 2 red, 3 blue, 4 green; 1 green, 2 blue, 2 red
+Game 54: 16 red, 4 blue; 1 green, 3 blue, 3 red; 2 green, 12 red; 2 green, 1 blue, 3 red; 10 blue, 6 red, 2 green
+Game 55: 1 blue, 4 red, 1 green; 2 blue, 2 red; 13 red, 4 blue, 1 green; 4 blue, 9 red; 1 green, 1 blue, 16 red
+Game 56: 12 blue, 12 green; 4 blue, 1 red, 3 green; 2 red, 12 green; 1 red, 11 green, 13 blue; 16 blue, 5 green
+Game 57: 1 blue, 3 red; 10 green, 5 red; 5 green, 2 red; 1 red, 13 green
+Game 58: 6 blue, 1 red, 6 green; 3 red, 9 blue; 4 red, 9 blue, 5 green; 1 green, 5 red, 7 blue
+Game 59: 10 red, 3 green, 3 blue; 6 blue, 11 red, 1 green; 5 green, 10 red; 16 red, 2 blue, 4 green; 3 green, 10 red
+Game 60: 2 green, 1 blue; 1 green, 1 blue, 4 red; 3 blue, 1 red, 1 green; 2 red, 2 green; 4 red
+Game 61: 5 red, 1 green, 10 blue; 9 red, 10 blue; 1 red, 2 green, 4 blue; 10 blue, 2 green, 9 red; 1 red, 12 blue, 2 green
+Game 62: 1 blue, 5 green; 4 blue, 12 green, 1 red; 7 blue, 3 green; 7 blue, 3 green; 3 blue, 1 green, 2 red; 7 blue, 1 red, 12 green
+Game 63: 4 blue, 2 green, 5 red; 1 green, 2 red, 2 blue; 4 blue, 2 red, 2 green; 1 blue, 6 red, 2 green; 6 blue, 1 red; 1 green, 9 red, 6 blue
+Game 64: 1 green; 3 green, 5 blue, 5 red; 3 red, 3 blue, 3 green; 1 green, 4 red, 6 blue; 5 red
+Game 65: 2 red; 1 blue, 1 red; 7 red, 2 blue; 1 green, 4 blue, 3 red
+Game 66: 3 red, 9 blue; 1 red, 6 blue, 15 green; 3 green, 3 red, 11 blue
+Game 67: 2 red, 1 green, 2 blue; 6 red, 1 green; 1 blue, 1 red, 4 green
+Game 68: 3 red, 1 blue; 1 green, 3 red, 2 blue; 1 green, 8 red; 2 blue, 3 red
+Game 69: 5 blue, 6 red; 1 green, 15 blue, 10 red; 1 green, 2 red, 4 blue; 5 blue, 7 red; 3 red, 1 green, 11 blue
+Game 70: 4 green, 2 red, 8 blue; 5 red, 3 blue; 10 green, 5 blue
+Game 71: 1 red, 2 blue, 9 green; 3 red, 8 green; 1 red, 2 blue, 6 green; 3 red, 6 blue, 8 green; 6 green, 3 blue, 2 red; 3 red, 8 green, 6 blue
+Game 72: 1 red, 11 green; 1 blue, 7 green, 1 red; 2 red, 12 green; 10 green, 6 red
+Game 73: 9 green, 2 red; 1 blue, 3 green; 1 blue, 1 red, 7 green; 2 blue, 9 green, 4 red; 2 blue, 3 red, 8 green; 2 green, 9 red
+Game 74: 2 green, 7 red; 1 green, 3 blue, 6 red; 4 green, 3 blue, 6 red; 2 green, 3 blue, 1 red; 3 red, 2 blue, 1 green
+Game 75: 15 green, 2 blue; 15 green, 6 red, 2 blue; 12 green, 2 blue, 1 red
+Game 76: 1 red, 9 green, 12 blue; 6 red, 12 green, 1 blue; 7 green, 2 blue, 1 red
+Game 77: 11 blue, 1 red; 7 blue, 2 red, 13 green; 10 blue, 10 green; 12 blue, 3 red
+Game 78: 4 green; 1 blue, 5 green; 5 green, 1 blue, 1 red
+Game 79: 4 green, 7 blue, 16 red; 1 blue, 10 red, 5 green; 3 green, 4 red, 3 blue; 11 blue, 18 red, 5 green
+Game 80: 1 red, 4 blue, 6 green; 14 blue, 16 red, 2 green; 2 blue, 5 red, 4 green; 2 green, 8 red; 18 red, 6 green, 2 blue; 18 red, 9 blue
+Game 81: 11 red, 8 blue, 1 green; 12 blue, 2 green, 14 red; 16 red, 2 green, 6 blue; 17 red, 2 green; 3 green, 3 blue, 15 red
+Game 82: 13 red, 1 blue, 6 green; 3 green, 12 red, 3 blue; 5 red, 3 green, 18 blue; 15 blue, 8 red
+Game 83: 9 green, 5 blue, 5 red; 8 green, 15 blue, 7 red; 4 green, 6 red, 10 blue; 5 green, 2 red
+Game 84: 2 blue, 2 green, 6 red; 2 green, 7 red, 1 blue; 3 green, 3 blue; 2 green, 3 red, 3 blue; 6 green, 4 red
+Game 85: 1 blue, 3 green, 5 red; 2 green, 2 red; 4 red, 3 blue; 2 green, 3 blue, 1 red; 4 red, 2 green, 4 blue
+Game 86: 6 red, 1 blue; 1 green, 16 red; 2 green, 1 red; 12 red, 1 blue
+Game 87: 6 red, 12 green, 1 blue; 5 blue, 6 red, 4 green; 2 blue, 5 red, 8 green
+Game 88: 3 green, 6 red, 2 blue; 3 blue, 2 green, 6 red; 1 red, 11 blue, 2 green
+Game 89: 7 red, 3 blue, 9 green; 6 red, 3 blue, 15 green; 2 blue, 6 red, 12 green; 5 red, 8 green; 3 blue, 7 red, 9 green; 5 red, 7 green
+Game 90: 2 green, 4 red, 19 blue; 13 blue, 4 red, 1 green; 14 blue, 8 green
+Game 91: 12 green, 5 blue, 4 red; 9 green, 10 blue, 1 red; 13 green, 1 blue, 4 red; 2 red, 5 blue; 2 blue, 7 green, 2 red; 5 blue, 5 green, 3 red
+Game 92: 9 red, 6 blue, 16 green; 11 green, 2 red, 7 blue; 1 green, 1 red, 3 blue; 4 green, 8 red
+Game 93: 1 green, 4 blue, 8 red; 2 red, 1 green, 2 blue; 2 blue, 9 red; 1 green, 4 blue, 3 red; 3 red, 1 green, 4 blue
+Game 94: 1 green, 7 red, 4 blue; 4 red, 3 blue; 16 blue, 9 red, 7 green; 9 red, 15 blue; 15 blue, 3 red, 6 green; 7 red, 10 blue, 12 green
+Game 95: 5 green, 6 blue; 10 green, 9 blue; 4 blue, 8 green, 2 red; 5 blue, 5 green, 1 red
+Game 96: 13 blue, 10 red, 2 green; 10 red, 2 green, 1 blue; 6 blue, 5 red, 3 green; 11 red, 3 green, 5 blue; 11 red, 2 green; 3 green, 6 blue
+Game 97: 9 green, 11 red, 8 blue; 6 red, 9 blue, 2 green; 3 red, 17 blue, 1 green
+Game 98: 14 blue, 3 green; 2 red, 15 blue, 3 green; 15 blue, 8 green, 1 red; 1 red, 8 green
+Game 99: 2 green, 7 blue; 14 red, 1 green, 4 blue; 8 blue, 13 red, 2 green; 10 green, 7 red, 10 blue
+Game 100: 5 green, 11 blue, 6 red; 5 green, 12 blue; 1 green, 14 blue, 1 red; 3 blue, 5 red, 6 green; 9 blue; 6 red

2023/day_02/sample.txt

@@ -0,0 +1,5 @@
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green

2023/day_02/solution.test.ts

@@ -0,0 +1,28 @@
+import path from "path";
+
+import { readlines } from "../../_utils";
+import { part1_solver, part2_solver } from "./solution";
+
+describe("day 2: cube conundrum, pt 1", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part1_solver(sample)).toBe(8);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part1_solver(input)).toBe(2683);
+  });
+});
+
+describe("day 2: cube conundrum, pt 2", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part2_solver(sample)).toBe(2286);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part2_solver(input)).toBe(49710);
+  });
+});

2023/day_02/solution.ts

@@ -0,0 +1,140 @@
+/*
+--- Day 2: Cube Conundrum ---
+
+You're launched high into the atmosphere! The apex of your trajectory just barely reaches the surface of a large island floating in the sky. You gently land in a fluffy pile of leaves. It's quite cold, but you don't see much snow. An Elf runs over to greet you.
+
+The Elf explains that you've arrived at Snow Island and apologizes for the lack of snow. He'll be happy to explain the situation, but it's a bit of a walk, so you have some time. They don't get many visitors up here; would you like to play a game in the meantime?
+
+As you walk, the Elf shows you a small bag and some cubes which are either red, green, or blue. Each time you play this game, he will hide a secret number of cubes of each color in the bag, and your goal is to figure out information about the number of cubes.
+
+To get information, once a bag has been loaded with cubes, the Elf will reach into the bag, grab a handful of random cubes, show them to you, and then put them back in the bag. He'll do this a few times per game.
+
+You play several games and record the information from each game (your puzzle input). Each game is listed with its ID number (like the 11 in Game 11: ...) followed by a semicolon-separated list of subsets of cubes that were revealed from the bag (like 3 red, 5 green, 4 blue).
+
+For example, the record of a few games might look like this:
+
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
+
+In game 1, three sets of cubes are revealed from the bag (and then put back again). The first set is 3 blue cubes and 4 red cubes; the second set is 1 red cube, 2 green cubes, and 6 blue cubes; the third set is only 2 green cubes.
+
+The Elf would first like to know which games would have been possible if the bag contained only 12 red cubes, 13 green cubes, and 14 blue cubes?
+
+In the example above, games 1, 2, and 5 would have been possible if the bag had been loaded with that configuration. However, game 3 would have been impossible because at one point the Elf showed you 20 red cubes at once; similarly, game 4 would also have been impossible because the Elf showed you 15 blue cubes at once. If you add up the IDs of the games that would have been possible, you get 8.
+
+Determine which games would have been possible if the bag had been loaded with only 12 red cubes, 13 green cubes, and 14 blue cubes. What is the sum of the IDs of those games?
+*/
+
+import { emptyLines, sum } from "../../_utils";
+
+const colors = ["red", "blue", "green"];
+const constraints = {
+  red: 12,
+  green: 13,
+  blue: 14,
+};
+
+type Game = {
+  id: number;
+  sets: Set[];
+};
+
+type Set = {
+  red?: number;
+  green?: number;
+  blue?: number;
+};
+
+const normalizeSet = (s: Set): Set => {
+  const { red = 0, green = 0, blue = 0 } = s;
+  return { red, green, blue };
+};
+
+const parseGameId = (s: string): number => +s.replace("Game", "").trim();
+const parseSets = (set: string): Set =>
+  set
+    .split(",")
+    .map((s) => s.trim())
+    .reduce((set, cube) => {
+      const color = colors.filter((c) => cube.includes(c))[0];
+      const number = +cube.replace(color, "").trim();
+
+      return { ...set, [color]: number };
+    }, {} as Set);
+
+const parseGames = (s: string): Game => {
+  const [gid, game] = s.split(":");
+
+  const id = parseGameId(gid);
+  const sets = game.split(";").map(parseSets).map(normalizeSet);
+
+  return { id, sets };
+};
+
+const withinConstraints = (g: Game): boolean =>
+  g.sets.every(
+    (set) =>
+      set.blue <= constraints.blue &&
+      set.green <= constraints.green &&
+      set.red <= constraints.red
+  );
+
+export function part1_solver(lines: string[]): number {
+  return lines
+    .filter(emptyLines)
+    .map(parseGames)
+    .filter(withinConstraints)
+    .map((g) => g.id)
+    .reduce(sum, 0);
+}
+
+/*
+--- Part Two ---
+
+The Elf says they've stopped producing snow because they aren't getting any water! He isn't sure why the water stopped; however, he can show you how to get to the water source to check it out for yourself. It's just up ahead!
+
+As you continue your walk, the Elf poses a second question: in each game you played, what is the fewest number of cubes of each color that could have been in the bag to make the game possible?
+
+Again consider the example games from earlier:
+
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
+
+    In game 1, the game could have been played with as few as 4 red, 2 green, and 6 blue cubes. If any color had even one fewer cube, the game would have been impossible.
+    Game 2 could have been played with a minimum of 1 red, 3 green, and 4 blue cubes.
+    Game 3 must have been played with at least 20 red, 13 green, and 6 blue cubes.
+    Game 4 required at least 14 red, 3 green, and 15 blue cubes.
+    Game 5 needed no fewer than 6 red, 3 green, and 2 blue cubes in the bag.
+
+The power of a set of cubes is equal to the numbers of red, green, and blue cubes multiplied together. The power of the minimum set of cubes in game 1 is 48. In games 2-5 it was 12, 1560, 630, and 36, respectively. Adding up these five powers produces the sum 2286.
+
+For each game, find the minimum set of cubes that must have been present. What is the sum of the power of these sets?
+*/
+
+const setPower = (set: Set): number => set.red * set.green * set.blue;
+const minimumCubesPossible = (game: Game): Set => {
+  return game.sets.reduce((maxes, currentSet) => {
+    const newMaxes = {};
+
+    newMaxes["blue"] = Math.max(currentSet.blue, maxes.blue || 0);
+    newMaxes["green"] = Math.max(currentSet.green, maxes.green || 0);
+    newMaxes["red"] = Math.max(currentSet.red, maxes.red || 0);
+
+    return newMaxes;
+  }, {} as Set);
+};
+
+export function part2_solver(lines: string[]): number {
+  return lines
+    .filter(emptyLines)
+    .map(parseGames)
+    .map(minimumCubesPossible)
+    .map(setPower)
+    .reduce(sum, 0);
+}

2023/day_03/input.txt

@@ -0,0 +1,140 @@
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+...+........................$........+..967*.........*....921......321......%................612@....*......................44..............
+.......764...716............818..327..............578.......*...../...........941..................736..@421........762.........282.........
+861#......*..@.......982..........*.........+...............714.................*..867.....863........................@....614....=.........
+........549................*....260.........91................................85.....$........*.803*895..622.$..............*.........684...
+............770*346.....714.652......145.........270...286..........#.......................66..........*.....337.176.813...483...223*......
+..........................................*..392..&.........505...957.@.........158...285......881#....497.........+...*....................
+.........=../..../.....588........227....639............741*..........443..681..........+..153........................335...................
+........201.671.96......$............*.....................................*........415.......*........-.......155...........848.58&........
+............................922......92...........180..........................&39...%....208..389......696.....*............=.......883.852
+....237.........950.........*............80..............................................*....................657.......................*...
+....../..611.......*.....671...443...971.&....366....381...442....458...$.......589.343.397.....463.......60.......&........125......&......
+..853...../..945..564...........*......*.......@......-................783..........*.......................*.......28......=.........373...
+................*.......+843..550..998.973.........+.....208.565..@..............231......292............+.365..172............+............
+......117......615..................*............299............&..862.895............/86...*....114..552........*...697.....733...388......
+.....................................212..261........885...............*...903..26*..........50.....-..........158................*.........
+...../........11..360....748......................67....*272.....320...16.....*....137.905......239......470......................433.......
+...141........*.....%......+......967........-...%...........243...*.......904............*....*..............88.377......619...............
+................=.....-668....%.....=.+461..525.....662.....*......196..28..............778...940..400..682...*...*.........*..638*.........
+779#..113........209...........744....................*...144..811....../...#......................-...*.....297..713.....50................
+.........$................#.........844...6...........62.......*.............957...&.......112@.......211.............173....989............
+..749.......$......989..931................*....&............424.........709.......867............590...................*.......*..645......
+...*..290...573......*............437....227.....53......132............#....471%.............501..%..................733.....270.....=.....
+..637...*............596............................=....*.......400...............*...........*....................................#.......
+......958.....757%.........=.........228......624...746.81../.....*........../..718.198..38...184..............*820..774......./830.693.....
+.........................453...405.=...=....................100.144.......728...........*...................498............$................
+..616............................*.756...310.........#52.............130.......=........506.....509.779..........723.......182..+...........
+...*....49.....-..............551..........*................789./.....*......306...613........./......*..491....*...............791..931....
+...863.....%.72......832.653........*490....814.....984.....=...741...568..........*.................998........567........+........#.......
+.........171..........*..-.......406...............*....389.....................486.....630............../...............457.576............
+..............308..515..................373@......709..&..............*185..................689..........751........44..........*764........
+..............*..............661....=.........*.............993....984.....*.......908......=...273............../.*........................
+.......582..335...260....59......998../.....39.760.313*174...*..........@.183......................*47....&994.887.577........*464.....22...
+......*...............................449..................802........762.....522..139+..154..266$......................46.323.....712*.....
+....827.....................................35......600*29.....724........488............*...............149*227.........*..................
+........@......278*............@..135..........594.........470*...........*....540*.......42..............................775.536..790......
+.....990...........742......181....*..............*..@521................743.......552............310...*....+738.....................*.....
+.......................125.......311............715........263...........................................173...................235....291...

2023/day_03/sample.txt

@@ -0,0 +1,10 @@
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..

2023/day_03/sample2.txt

@@ -0,0 +1,7 @@
+123.456...
+...*......
+..........
+123*456...
+..........
+..123*....
+......456

2023/day_03/solution.test.ts

@@ -0,0 +1,31 @@
+import path from "path";
+
+import { readlines } from "../../_utils";
+import { part1_solver, part2_solver } from "./solution";
+
+describe("day 3: gear ratios, pt 1", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part1_solver(sample)).toBe(4361);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part1_solver(input)).toBe(553825);
+  });
+});
+
+describe("day 3: gear ratios, pt 2", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part2_solver(sample)).toBe(467835);
+
+    const sample2 = await readlines(path.resolve(__dirname, "./sample2.txt"));
+    expect(part2_solver(sample2)).toBe(168264);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part2_solver(input)).toBe(82962801);
+  });
+});

2023/day_03/solution.ts

@@ -0,0 +1,410 @@
+/*
+
+*/
+
+import { sum } from "../../_utils";
+
+function isDigit(char: string): boolean {
+  return /^\d$/.test(char);
+}
+
+function isSymbol(char: string): boolean {
+  return !isDigit(char) && char !== ".";
+}
+
+function getCharAt(
+  m: string[],
+  row: number,
+  column: number,
+  fallback: string = "."
+): string {
+  if (typeof m[row] !== "undefined") {
+    return m[row][column] || fallback;
+  } else {
+    return fallback;
+  }
+}
+
+export function part1_solver(lines: string[]): number {
+  // approach:
+  //  1. assume all numbers are invalid at first (pending)
+  //  2. continuously check the pending numbers to see if they can be moved to valid (a symbol is found)
+  //  3. once the iterator is out of range of a number, move it to invalid list
+  let valid_part_numbers = [];
+
+  lines.forEach((line, row) => {
+    // const elements = line.split(".");
+    let column = 0;
+    let buffer = "";
+
+    let is_valid = false;
+    while (column <= line.length) {
+      const current_char = line[column];
+
+      if (isDigit(current_char)) {
+        buffer += current_char;
+
+        // check previous row
+        const up_left = getCharAt(lines, row - 1, column - 1);
+        const up_mid = getCharAt(lines, row - 1, column);
+        const up_right = getCharAt(lines, row - 1, column + 1);
+
+        const left = getCharAt(lines, row, column - 1);
+        const right = getCharAt(lines, row, column + 1);
+
+        const down_left = getCharAt(lines, row + 1, column - 1);
+        const down_mid = getCharAt(lines, row + 1, column);
+        const down_right = getCharAt(lines, row + 1, column + 1);
+
+        if (!is_valid) {
+          is_valid =
+            isSymbol(up_left) ||
+            isSymbol(up_mid) ||
+            isSymbol(up_right) ||
+            isSymbol(left) ||
+            isSymbol(right) ||
+            isSymbol(down_left) ||
+            isSymbol(down_mid) ||
+            isSymbol(down_right);
+        }
+
+        if (isDigit(right)) {
+          column += 1;
+          continue;
+        } else if (isSymbol(right)) {
+          valid_part_numbers.push(buffer);
+          is_valid = false;
+          buffer = "";
+        } else {
+          if (is_valid) {
+            valid_part_numbers.push(buffer);
+          }
+
+          is_valid = false;
+          buffer = "";
+        }
+      } else {
+        buffer = "";
+        is_valid = false;
+        column += 1;
+        continue;
+      }
+
+      column += 1;
+    }
+  });
+
+  return valid_part_numbers
+    .map((nstr) => +nstr)
+    .filter((n) => !isNaN(n))
+    .reduce(sum, 0);
+}
+
+/*
+
+*/
+type Element = {
+  kind: "number" | "gear";
+  value: string;
+  position: [number, number];
+};
+
+type Gear = {
+  n1: number;
+  n2: number;
+};
+
+const checkColumsFor = (
+  lines: string[],
+  row: number,
+  columns: number[]
+): number[] => {
+  let matched_nums = [];
+
+  columns.forEach((column) => {
+    if (isDigit(getCharAt(lines, row, column))) {
+      // The target value was a digit. There are two cases:
+      //  1. The digit belongs to the same number we've seen before. E.g.
+      //        ...123.......
+      //        ....*........
+      //  2. The digit belongs to a new number on that row. E.g.
+      //        ...123.456...
+      //        ......*......
+    } else {
+      // The target value was not a digit, so ignore
+    }
+  });
+
+  // columns.map(col => isDigit(getCharAt(lines, row, col))).every()
+  return columns.reduce((matched_nums, column) => {
+    if (isDigit(getCharAt(lines, row, column))) {
+    }
+  }, []);
+};
+
+const checkTopRow = (
+  lines: string[],
+  currentRow: number,
+  currentColumn: number
+): number[] => {
+  const row = currentRow - 1;
+  const column = currentColumn;
+  let adjacent_nums = [];
+
+  const up_left = getCharAt(lines, row, currentColumn - 1);
+  const up_mid = getCharAt(lines, row, currentColumn);
+  const up_right = getCharAt(lines, row, currentColumn + 1);
+
+  if (isDigit(up_left) || isDigit(up_mid) || isDigit(up_right)) {
+    console.log("found on prev row");
+    // get all the nums from the previous row
+    const nums = (lines[row - 1] || "")
+      .split(".")
+      .filter((s) => s.length > 0)
+      .map((s) =>
+        s
+          .split("")
+          .filter((c) => isDigit(c))
+          .join("")
+      );
+
+    // figure out which num overlaps this gear
+    const res1 = nums.find((n) => {
+      const foundNumIndex = lines[row - 1].indexOf(n);
+      const lastDigit = foundNumIndex + n.length - 1;
+
+      console.log(JSON.stringify({ foundNumIndex, lastDigit, column }));
+      return (
+        foundNumIndex === column - 1 ||
+        foundNumIndex === column ||
+        foundNumIndex === column + 1 ||
+        lastDigit === column - 1 ||
+        lastDigit === column ||
+        lastDigit === column + 1 ||
+        (column - 1 >= foundNumIndex && column + 1 <= lastDigit)
+      );
+    });
+
+    if (res1) {
+      adjacent_nums.push(res1);
+
+      const res2 = nums.slice(nums.indexOf(res1)).find((n) => {
+        const foundNumIndex = lines[row - 1].indexOf(n);
+        const lastDigit = foundNumIndex + n.length - 1;
+
+        console.log(JSON.stringify({ foundNumIndex, lastDigit, column }));
+        return (
+          foundNumIndex === column - 1 ||
+          foundNumIndex === column ||
+          foundNumIndex === column + 1 ||
+          lastDigit === column - 1 ||
+          lastDigit === column ||
+          lastDigit === column + 1 ||
+          (column - 1 >= foundNumIndex && column + 1 <= lastDigit)
+        );
+      });
+
+      if (res2) {
+        adjacent_nums.push(res2);
+      }
+
+      console.log(
+        "res is " +
+          JSON.stringify({
+            res1,
+            res2,
+            nums,
+            last: lines[row - 1],
+            column,
+          })
+      );
+    }
+  }
+
+  return adjacent_nums;
+};
+
+const checkCurrentRow = (
+  lines: string[],
+  currentRow: number,
+  currentColumn: number
+): number[] => {
+  const row = currentRow - 1;
+  const column = currentColumn;
+  let adjacent_nums = [];
+
+  const left = getCharAt(lines, row, column - 1);
+  const right = getCharAt(lines, row, column + 1);
+
+  if (isDigit(left) || isDigit(right)) {
+    console.log("found on this row");
+    // get all the nums from this row
+    const nums = lines[row]
+      .split(".")
+      .filter((s) => s.length > 0)
+      .map((s) =>
+        s
+          .split("")
+          .filter((c) => isDigit(c))
+          .join("")
+      );
+
+    // figure out which num overlaps this gear
+    const res1 = nums.find((n) => {
+      const foundNumIndex = lines[row].indexOf(n);
+      const lastDigit = foundNumIndex + n.length - 1;
+
+      return (
+        foundNumIndex === column - 1 ||
+        foundNumIndex === column ||
+        foundNumIndex === column + 1 ||
+        lastDigit === column - 1 ||
+        lastDigit === column ||
+        lastDigit === column + 1 ||
+        (column - 1 >= foundNumIndex && column + 1 <= lastDigit)
+      );
+    });
+
+    if (res1) {
+      adjacent_nums.push(res1);
+
+      const res2 = nums.find((n) => {
+        const foundNumIndex = lines[row].indexOf(n);
+        const lastDigit = foundNumIndex + n.length - 1;
+
+        return (
+          foundNumIndex === column - 1 ||
+          foundNumIndex === column ||
+          foundNumIndex === column + 1 ||
+          lastDigit === column - 1 ||
+          lastDigit === column ||
+          lastDigit === column + 1 ||
+          (column - 1 >= foundNumIndex && column + 1 <= lastDigit)
+        );
+      });
+
+      if (res2) {
+        adjacent_nums.push(res2);
+      }
+    }
+  }
+
+  return adjacent_nums;
+};
+
+const checkBottomRow = (
+  lines: string[],
+  currentRow: number,
+  currentColumn: number
+): number[] => {
+  const row = currentRow - 1;
+  const column = currentColumn;
+  let adjacent_nums = [];
+
+  const down_left = getCharAt(lines, row + 1, column - 1);
+  const down_mid = getCharAt(lines, row + 1, column);
+  const down_right = getCharAt(lines, row + 1, column + 1);
+
+  if (isDigit(down_left) || isDigit(down_mid) || isDigit(down_right)) {
+    console.log("found on next row");
+    // get all the nums from the next row
+    const nums = lines[row + 1]
+      .split(".")
+      .filter((s) => s.length > 0)
+      .map((s) =>
+        s
+          .split("")
+          .filter((c) => isDigit(c))
+          .join("")
+      );
+
+    // figure out which num overlaps this gear
+    const res1 = nums.find((n) => {
+      // [6 7 8 9]
+      // [0 1 2 3]
+      const foundNumIndex = lines[row + 1].indexOf(n);
+      const lastDigitIndex = foundNumIndex + n.length - 1;
+
+      return (
+        foundNumIndex === column - 1 ||
+        foundNumIndex === column ||
+        foundNumIndex === column + 1 ||
+        lastDigitIndex === column - 1 ||
+        lastDigitIndex === column ||
+        lastDigitIndex === column + 1 ||
+        (column - 1 >= foundNumIndex && column + 1 <= lastDigitIndex)
+      );
+    });
+
+    if (res1) {
+      adjacent_nums.push(res1);
+
+      const res2 = nums.find((n) => {
+        // [6 7 8 9]
+        // [0 1 2 3]
+        const foundNumIndex = lines[row + 1].indexOf(n);
+        const lastDigitIndex = foundNumIndex + n.length - 1;
+
+        return (
+          foundNumIndex === column - 1 ||
+          foundNumIndex === column ||
+          foundNumIndex === column + 1 ||
+          lastDigitIndex === column - 1 ||
+          lastDigitIndex === column ||
+          lastDigitIndex === column + 1 ||
+          (column - 1 >= foundNumIndex && column + 1 <= lastDigitIndex)
+        );
+      });
+
+      if (res2) {
+        adjacent_nums.push(res2);
+      }
+    }
+  }
+
+  return adjacent_nums;
+};
+
+export function part2_solver(lines: string[]): number {
+  let gears: Gear[] = [];
+
+  lines.forEach((line, row) => {
+    let column = 0;
+    let adjacent_nums = [];
+
+    while (column <= line.length) {
+      const current_char = line[column];
+
+      if (current_char === "*") {
+        const top_nums = checkTopRow(lines, row, column);
+        adjacent_nums.push(top_nums);
+
+        const current_nums = checkCurrentRow(lines, row, column);
+        adjacent_nums.push(current_nums);
+
+        const bottom_nums = checkBottomRow(lines, row, column);
+        adjacent_nums.push(bottom_nums);
+
+        console.log(JSON.stringify({ adjacent_nums }));
+
+        if (adjacent_nums.length === 2) {
+          console.log("found a gear!");
+          gears.push({ n1: +adjacent_nums[0], n2: +adjacent_nums[1] });
+        } else {
+          adjacent_nums = [];
+        }
+      } else {
+        adjacent_nums = [];
+        column += 1;
+        continue;
+      }
+
+      column += 1;
+    }
+  });
+
+  return gears
+    .map((g) => g.n1 * g.n2)
+    .filter((n) => !isNaN(n))
+    .reduce(sum, 0);
+}

2023/day_04/input.txt

@@ -0,0 +1,219 @@
+Card   1: 99 65 21  4 72 20 77 98 27 70 | 34 84 74 18 41 45 72  2  1 75 52 47 50 93 25 10 79 87 42 69  8 12 54 96 92
+Card   2: 51 49 25 92 40 31 18  3 83  4 |  4 40 57 75 16 38 25 92 51  3 36 77 70 94 83 49 18 59 19 31 41 99 43 89 15
+Card   3:  5 52 69 84 27 47 17 49 32 98 | 76 82 97  2 17 34 32 31 55 84 87 49 91 81  5 72 23 67 21 35 66 65 44 12 98
+Card   4:  2 81 24 58  9 82 21 43 85 83 | 38 21 97 67 82 85 40 24 93 59 53 46  5 15 81 33 22 58  8 89 94  2  3 69 72
+Card   5:  6 72 50 45 29 12 55 31 68 62 | 45 16 80 68 29 27 55  7 72 31 66 20 39  9 13 12 62 30 50  6 94 49 42 81  4
+Card   6: 26 87 63 54 56 79 90 19 23  7 | 55 13 10 66 17  6 91 93 51 22 65 38 16 68 84 64 43 81 24 85 75 69 11  2  3
+Card   7: 63  5 44 82 67 85  1 86 43 47 | 27 69 85 64 34 12  1 36 94 82  4 16 46 63  5 92 14 68 49 86 80 84 67 25 44
+Card   8: 51 70 64 30 87 82  2 67 39 56 | 11 49  5 40 58 22 19 53  1 41 66 44  4 65 43 72 98 95 52  8 23 45  3 27 48
+Card   9:  9 53 83 37 28 10 74 51 47 59 | 51 65 22  5 87 33 23 17 37 72 60 39 20 88 62 25 40 35  8 11 64 26 55  1 34
+Card  10: 84 67 52 95 62 83 39 96  6 14 | 95  5 24 10 96 83 22 21 58 84 26 52 68 32 14  1 67 35 45 37 40  6 76 62 97
+Card  11: 62 33 65 83 31 20 45 96  8 63 | 98 96 29 69  7 24 15  4 74 14 65 89 34 37 75 78 46 11 17 40  1 57 94  9 55
+Card  12: 29 47 83 13 31 58  3 43  6 46 |  6 81 45 26 31 58  3 21 20 47 75 71 13 74 22 93 35 96 38 44 85 83 29 28 50
+Card  13: 33 97 31 48 60 98 94 80 30 29 | 16 33 73 49 37 44 41 47 34 83 11 62 54 86 60 84 29 63 94 28 59 61 71 98 40
+Card  14: 47 16 73 33 50 46 39  4 98 14 | 70 62 15 52 98 74 17 69 23  4 94 79 10 19 50  7 37 41  1 39 25  5 86 28 87
+Card  15: 27 14 33 76 13 55 87 53 44 74 | 23 17 37 91 66 89 24 86 44 49 52 34 79  6 56  1 46 29  9 71 48 30 31 35 60
+Card  16: 95  6  8 69 70 72 60 43 76 30 | 37 83 63 36  9 26  6 20 66 39 52 19 69 12 62 85 32 82 35 45 55 51 18 60 17
+Card  17: 74 76 40 52  9 43 59 37 17 92 | 73 62 70 27 55 47 11 18 74  1 71  3 88 65 89  2 58 86 10 42 22 56 29 36 30
+Card  18: 79  5 97 48 36 10 67 56  7  6 | 21 54 33 95 43 71 14 46 82 23 70 73 74 51 27 78 91 88 42 92 39 64 18 13 59
+Card  19: 62 32  7 51  8 22 26 41 30 16 | 28  9 81  2 53 52 78 25 56 86  3 10 67  1 22 79 24 17 43 99 87 82 93 34 58
+Card  20: 41 52 12 40 17 56 72 84 98 63 | 71 69 37 74 47 97  9 34  6 36 96 95  8 49 39 15 85  5 46 64 93 54 20  2 89
+Card  21: 85 60 95 97  1 33 27 86 57 54 | 65 97 50 86 45 25 33 70 61 19 54 90 60 57 78  1 29 63 27 76 95 52 46 85 47
+Card  22: 43 98 37 17 44 70 52 96 61  8 | 60 17 77 34 74 16 14 22 10 98 52 96 67 62 43 49  8 61 47 90 29 63 70 44 37
+Card  23: 68 58 25 26  6 65 38  2 17 80 | 99 26 36 22 52  6 13 82 17 10 65 15 58  3 68 14  2 77 80 84 72 46 29 25 38
+Card  24: 47  9 24 20 15 57 29 83 75 11 | 33 47 91 75 20 57 11 27 29 10 14 26 83 15 24 43 82 86  9 18  1 61 98 46 76
+Card  25: 92 63  7 80 40 90 46 84 78 12 | 63 40 24 84 75 80 87 56 74 79 92 59  2 66 16 96 78 12 67 46 61 90 86 38  7
+Card  26: 33 13 64 23 46 81 73 54 25 95 |  7 75 50 67 44 69 70 22 45 30 12 93 17 26 11 55 10 52 53 36 79 62 27 92  9
+Card  27: 58 66 74 59 73 17 92 61 80 99 |  2 83 81 31 34 57  7 22 32 74 39 15 44 23  9 90 88  3 46 20 62 51 42 21 95
+Card  28: 35 55 89 36 68 49 79 62  4 31 |  1 26 23 88 28 49 58 54 44 60 33  9  5 99  8  2 95 20 40 12 72 82 43 50 25
+Card  29: 73 80  6 42 37 33 68 34 31 79 |  6 63 65 57 77 73 99 56 16 28 80 90 31 51 52 45 79  1 17 42 37 68 46  4 91
+Card  30: 99 89  9 45 13  6 91 57 73 90 | 92 54 13  2 40 10 78 71  7  3 49 37 60 53 96 73 61 98  1 45 66 24 48 94 19
+Card  31: 21 57  2 83 51 17 96 79 16 60 | 72 35  2 83 51 16 41 96 17 80 25 26 46 57 60 10 50 58 49 79 43 75 21 82  1
+Card  32: 25 37 47 88 28 84 49 35 27 71 | 90 73  1 13 93 16 52 74 67 62  7 69 56 87 21 63 86 32 58 59 27 97 61 88 83
+Card  33: 68 38 12 31 86 27 41 15 21 66 | 56 64 75 86 19 27 61  7 15 29  3 67 28 11 66 21 22 14 40 24 68 94 13 53 18
+Card  34:  9 58  8 48 43 78 67 96 62  6 | 59 56 13 92 77 10 89 71 72 65 98 33 23 40 30 44 97 54 52 84 36 82 26 32 19
+Card  35: 74 35 15 51 19  2 98 22  5 20 | 68 60 62 22 84 98 15  7 24 30 18 19 56 52 80 37 74 26 54 41  8 31 34 61 49
+Card  36: 82  3 19 48 71 65 47 89 21 36 | 43 75 96  2 32 91 28 37 69 71 18 57 15 35 25 24 88 34 52 31 79 17 49 20 26
+Card  37: 72 35 36 87 99 38 91 24  3 20 |  9 62 21 28 64 13  8 35 75 69 87 97 15 46 98 89 24 12 43 34 19 86 72 41 92
+Card  38: 96 81 10 64 65 84 38 30 80 68 | 84  3 91 30 26 36 69 95 10 40 87 99 13  7 75 38 82 80  2 31 37 28 90 48 52
+Card  39:  6 62 96 34 41 98 81  5 11 57 | 95 59 67 46 36 38 27 74 97 87 72 69 32 37 94 98 79 17 49  5 10 42 48 51 30
+Card  40: 96 15 86 31 62 56 22 41 93 33 | 90 21 67 65 50 70 35 89 38 84 55 77 59 57 83 69  2 37 20 36 52 80 27 85 19
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2023/day_04/sample.txt

@@ -0,0 +1,6 @@
+Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
+Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1
+Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83
+Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11

2023/day_04/solution.test.ts

@@ -0,0 +1,28 @@
+import path from "path";
+
+import { readlines } from "../../_utils";
+import { part1_solver, part2_solver } from "./solution";
+
+describe("day 4: scratchcards, pt 1", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part1_solver(sample)).toBe(13);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part1_solver(input)).toBe(32609);
+  });
+});
+
+describe("day 4: scratchcards, pt 2", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part2_solver(sample)).toBe(30);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part2_solver(input)).toBe(14624680);
+  });
+});

2023/day_04/solution.ts

@@ -0,0 +1,143 @@
+/*
+--- Day 4: Scratchcards ---
+
+The gondola takes you up. Strangely, though, the ground doesn't seem to be coming with you; you're not climbing a mountain. As the circle of Snow Island recedes below you, an entire new landmass suddenly appears above you! The gondola carries you to the surface of the new island and lurches into the station.
+
+As you exit the gondola, the first thing you notice is that the air here is much warmer than it was on Snow Island. It's also quite humid. Is this where the water source is?
+
+The next thing you notice is an Elf sitting on the floor across the station in what seems to be a pile of colorful square cards.
+
+"Oh! Hello!" The Elf excitedly runs over to you. "How may I be of service?" You ask about water sources.
+
+"I'm not sure; I just operate the gondola lift. That does sound like something we'd have, though - this is Island Island, after all! I bet the gardener would know. He's on a different island, though - er, the small kind surrounded by water, not the floating kind. We really need to come up with a better naming scheme. Tell you what: if you can help me with something quick, I'll let you borrow my boat and you can go visit the gardener. I got all these scratchcards as a gift, but I can't figure out what I've won."
+
+The Elf leads you over to the pile of colorful cards. There, you discover dozens of scratchcards, all with their opaque covering already scratched off. Picking one up, it looks like each card has two lists of numbers separated by a vertical bar (|): a list of winning numbers and then a list of numbers you have. You organize the information into a table (your puzzle input).
+
+As far as the Elf has been able to figure out, you have to figure out which of the numbers you have appear in the list of winning numbers. The first match makes the card worth one point and each match after the first doubles the point value of that card.
+
+For example:
+
+Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
+Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1
+Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83
+Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11
+
+In the above example, card 1 has five winning numbers (41, 48, 83, 86, and 17) and eight numbers you have (83, 86, 6, 31, 17, 9, 48, and 53). Of the numbers you have, four of them (48, 83, 17, and 86) are winning numbers! That means card 1 is worth 8 points (1 for the first match, then doubled three times for each of the three matches after the first).
+
+    Card 2 has two winning numbers (32 and 61), so it is worth 2 points.
+    Card 3 has two winning numbers (1 and 21), so it is worth 2 points.
+    Card 4 has one winning number (84), so it is worth 1 point.
+    Card 5 has no winning numbers, so it is worth no points.
+    Card 6 has no winning numbers, so it is worth no points.
+
+So, in this example, the Elf's pile of scratchcards is worth 13 points.
+
+Take a seat in the large pile of colorful cards. How many points are they worth in total?
+*/
+
+import { emptyLines, extractNumbers, sum } from "../../_utils";
+
+type Card = {
+  cardNumber: number,
+  winningNumbers: number[],
+  scratchedNumbers: number[]
+}
+
+function numMatches(card: Card): number {
+  return card.scratchedNumbers.reduce((numMatches, number) => {
+    if (card.winningNumbers.includes(number)) {
+      return numMatches + 1
+    } else {
+      return numMatches
+    }
+  }, 0)
+}
+
+function cardScore(card: Card): number {
+  const matches = numMatches(card);
+  const score = matches > 0 ? 2 ** (matches - 1) : 0;
+  return score;
+}
+
+function parseCard(line: string): Card {
+  const [cardStr, numbersStr] = line.split(":");
+
+  const cardNumber = extractNumbers(cardStr)
+  const [winning, scratched] = numbersStr.split("|");
+
+  const winningNumbers = winning.split(" ").filter(emptyLines).map(extractNumbers)
+  const scratchedNumbers = scratched.split(" ").filter(emptyLines).map(extractNumbers)
+
+  return { cardNumber, winningNumbers, scratchedNumbers };
+}
+
+export function part1_solver(lines: string[]): number {
+  return lines.filter(emptyLines).map(parseCard).map(c => cardScore(c)).reduce(sum);
+}
+
+
+/*
+--- Part Two ---
+
+Just as you're about to report your findings to the Elf, one of you realizes that the rules have actually been printed on the back of every card this whole time.
+
+There's no such thing as "points". Instead, scratchcards only cause you to win more scratchcards equal to the number of winning numbers you have.
+
+Specifically, you win copies of the scratchcards below the winning card equal to the number of matches. So, if card 10 were to have 5 matching numbers, you would win one copy each of cards 11, 12, 13, 14, and 15.
+
+Copies of scratchcards are scored like normal scratchcards and have the same card number as the card they copied. So, if you win a copy of card 10 and it has 5 matching numbers, it would then win a copy of the same cards that the original card 10 won: cards 11, 12, 13, 14, and 15. This process repeats until none of the copies cause you to win any more cards. (Cards will never make you copy a card past the end of the table.)
+
+This time, the above example goes differently:
+
+Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
+Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1
+Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83
+Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11
+
+    Card 1 has four matching numbers, so you win one copy each of the next four cards: cards 2, 3, 4, and 5.
+    Your original card 2 has two matching numbers, so you win one copy each of cards 3 and 4.
+    Your copy of card 2 also wins one copy each of cards 3 and 4.
+    Your four instances of card 3 (one original and three copies) have two matching numbers, so you win four copies each of cards 4 and 5.
+    Your eight instances of card 4 (one original and seven copies) have one matching number, so you win eight copies of card 5.
+    Your fourteen instances of card 5 (one original and thirteen copies) have no matching numbers and win no more cards.
+    Your one instance of card 6 (one original) has no matching numbers and wins no more cards.
+
+Once all of the originals and copies have been processed, you end up with 1 instance of card 1, 2 instances of card 2, 4 instances of card 3, 8 instances of card 4, 14 instances of card 5, and 1 instance of card 6. In total, this example pile of scratchcards causes you to ultimately have 30 scratchcards!
+
+Process all of the original and copied scratchcards until no more scratchcards are won. Including the original set of scratchcards, how many total scratchcards do you end up with?
+*/
+
+type CardCopies = {
+  [cardNumber: number]: number
+}
+
+export function part2_solver(lines: string[]): number {
+  const copies = lines.filter(emptyLines).map(parseCard).reduce((copyCounts, card) => {
+    const newCopyCounts = { ...copyCounts }
+
+    newCopyCounts[card.cardNumber] = newCopyCounts[card.cardNumber] || 1;
+    const currentCount = newCopyCounts[card.cardNumber];
+
+    const matches = numMatches(card);
+
+    const floor = card.cardNumber + 1;
+    const ceiling = matches + card.cardNumber + 1;
+
+    for (let i = floor; i < ceiling; i++) {
+      newCopyCounts[i] = (newCopyCounts[i] || 1) + (currentCount)
+    }
+
+    console.log(`${card.cardNumber} === ${matches} =========================================`)
+    console.log(newCopyCounts)
+
+    return newCopyCounts;
+  }, {} as CardCopies);
+
+  // console.log(copies)
+
+  return Object.values(copies).reduce(sum)
+}

2023/day_05/input.txt

@@ -0,0 +1,197 @@
+seeds: 565778304 341771914 1736484943 907429186 3928647431 87620927 311881326 149873504 1588660730 119852039 1422681143 13548942 1095049712 216743334 3671387621 186617344 3055786218 213191880 2783359478 44001797
+
+seed-to-soil map:
+1136439539 28187015 34421000
+4130684560 3591141854 62928737
+2493176649 2843539493 216586902
+4035246184 3979580848 40675839
+784987951 2449883248 10512167
+1230114095 458474273 89127842
+3591141854 4278550666 16416630
+795500118 1007741104 49669915
+4075922023 4020256687 54762537
+1170860539 385724159 59253556
+1754134353 1447758461 710855281
+2464989634 0 28187015
+3811089926 3654070591 224156258
+367106182 564462768 34737691
+0 3060126395 64826339
+1438999297 87449756 298274403
+1319241937 901480302 106260802
+1425502739 444977715 13496558
+906091129 2158613742 230348410
+401843873 2460395415 383144078
+1737273700 547602115 16860653
+64826339 599200459 302279843
+2709763551 1057411019 390347442
+845170033 2388962152 60921096
+3607558484 4075019224 203531442
+3100110993 3124952734 265337006
+4193613297 3878226849 101353999
+3365447999 62608015 24841741
+
+soil-to-fertilizer map:
+2997768542 2385088490 141138894
+2483957796 2361581050 23507440
+98641524 1346083581 385280737
+3138907436 2256873732 8670947
+0 2158232208 98641524
+3147578383 2265544679 96036371
+1035235183 2879344429 108036359
+2567031012 2526227384 63435416
+740156227 2589662800 180702628
+2630466428 1790930094 367302114
+1029837856 0 5397327
+1143271542 5397327 1340686254
+483922261 2987380788 256233966
+2507465236 1731364318 59565776
+920858855 2770365428 108979001
+
+fertilizer-to-water map:
+1539871014 1431400479 38399903
+4189242304 3947275099 105724992
+2012473116 0 61612686
+3673653298 3769966020 177309079
+25380533 833117788 21807501
+143369400 1411638591 19761888
+2698209531 61612686 40666379
+401367210 2888296065 27849039
+3850962377 4057978463 170640183
+1076364770 854925289 39443942
+0 2048878915 25380533
+2682826842 1483785677 15382689
+4026580932 4228618646 66348650
+790899137 2074259448 70405647
+2738875910 2609016218 230235412
+2090748148 1854132037 12185242
+163131288 1499168366 238235922
+1115808712 3002097202 63461270
+545943998 1215727887 195910704
+4092929582 3673653298 96312722
+1000530579 3065558472 75834191
+2074085802 2916145104 16662346
+429216249 1737404288 116727749
+1578270917 2174814019 434202199
+2969111322 102279065 44844471
+1179269982 669063687 164054101
+2463111278 507301424 161762263
+741854702 2839251630 49044435
+3013955793 894369231 236513741
+861304784 2144665095 30148924
+1525885719 1469800382 13985295
+132032949 2932807450 11336451
+2102933390 147123536 360177888
+47188034 1130882972 84844915
+4021602560 4053000091 4978372
+2624873541 2944143901 57953301
+891453708 3141392663 109076871
+1343324083 1866317279 182561636
+
+water-to-light map:
+1509583382 1639808290 20361832
+3841220400 2799952377 116887408
+1472887638 3349716751 36695744
+1375316591 4197396249 97571047
+1030032900 38536653 44339012
+3776233310 1557050237 64987090
+1857053855 3386412495 71799907
+2963593546 2694182899 38493443
+3758462347 1622037327 17770963
+1018869652 82875665 11163248
+1308040556 2732676342 67276035
+1928853762 3953749938 243646311
+2488961036 3503789336 239267964
+3562290347 3458212402 6096433
+3568386780 1308040556 190075567
+2728229000 1997029610 235364546
+215668494 0 38536653
+1646361217 3743057300 109790942
+1529945214 3233300748 116416003
+1756152159 3852848242 100901696
+3958107808 1660170122 336859488
+3503356233 1498116123 58934114
+254205147 552157437 522214475
+3002086989 3464308835 39480501
+776419622 94038913 242450030
+2172500073 2916839785 316460963
+0 336488943 215668494
+3041567490 2232394156 461788743
+
+light-to-temperature map:
+3498288578 2645051323 42074132
+608593503 673232568 65024140
+0 1287033796 108723708
+3979313387 3634135302 315653909
+2652759587 3018896130 103365881
+1093544955 942695289 7961217
+2756125468 3501628238 132507064
+419683046 1625547778 126722533
+683243352 349510049 26140330
+1101506172 511314709 142580382
+1283347805 375650379 135664330
+673617643 24016268 9625709
+709383682 1238532395 48501401
+3763762608 2402322728 184668443
+3948431051 2621479653 23571670
+3660408219 2687125455 102463666
+3561232935 2586991171 34488482
+2459767392 3122262011 192992195
+1244086554 1754618583 31645052
+1073753155 1497748002 19791800
+3972002721 3949789211 7310666
+3540362710 4077337854 20870225
+1419012135 738256708 79984976
+1746461061 1457945428 39802574
+3595721417 4190079809 64686802
+1616767336 653895091 19337477
+1275731606 823578131 7616199
+108723708 818241684 5336447
+546405579 1395757504 62187924
+1498997111 950656506 117770225
+2888632532 3957099877 102103275
+1744112789 1752270311 2348272
+2233819388 2077946837 225948004
+3762871885 2401432005 890723
+2136282224 2303894841 97537164
+3311914546 3315254206 186374032
+2118147522 4059203152 18134702
+308182087 831194330 111500959
+114060155 0 24016268
+2077946837 4254766611 40200685
+971525741 33641977 102227414
+1636104813 1517539802 108007976
+138076423 1068426731 170105664
+3220042816 4098208079 91871730
+2990735807 2789589121 229307009
+757885083 135869391 213640658
+
+temperature-to-humidity map:
+1130946446 972737563 146373650
+1277320096 1760175559 41760032
+4151385320 4147641404 143581976
+2634337722 0 466605084
+1992884166 956487184 16250379
+4147641404 4291223380 3743916
+641064346 466605084 489882100
+1319080128 1801935591 673804038
+2009134545 2475739629 625203177
+0 1119111213 641064346
+
+humidity-to-location map:
+3903940466 3635148971 125939893
+1458128760 2186815403 67353660
+3125319983 1458128760 728686643
+2261072201 3994982121 66012689
+3854006626 2992363154 49933840
+1525482420 3780550419 183145699
+2233668127 3967578047 27404074
+2442260515 3138011064 466023456
+740912129 0 327948845
+2422798960 3761088864 19461555
+1708628119 3963696118 3881929
+2327084890 3042296994 95714070
+4029880359 3604034520 31114451
+1712510048 2471205075 521158079
+367508399 695457244 373403730
+2908283971 2254169063 217036012
+0 327948845 367508399

2023/day_05/sample.txt

@@ -0,0 +1,33 @@
+seeds: 79 14 55 13
+
+seed-to-soil map:
+50 98 2
+52 50 48
+
+soil-to-fertilizer map:
+0 15 37
+37 52 2
+39 0 15
+
+fertilizer-to-water map:
+49 53 8
+0 11 42
+42 0 7
+57 7 4
+
+water-to-light map:
+88 18 7
+18 25 70
+
+light-to-temperature map:
+45 77 23
+81 45 19
+68 64 13
+
+temperature-to-humidity map:
+0 69 1
+1 0 69
+
+humidity-to-location map:
+60 56 37
+56 93 4

2023/day_05/solution.test.ts

@@ -0,0 +1,28 @@
+import path from "path";
+
+import { readlines } from "../../_utils";
+import { part1_solver, part2_solver } from "./solution";
+
+describe("day 5: fertilizer, pt 1", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part1_solver(sample)).toBe(-1);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part1_solver(input)).toBe(-1);
+  });
+});
+
+describe("day 5: fertilizer, pt 2", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part2_solver(sample)).toBe(-1);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part2_solver(input)).toBe(-1);
+  });
+});

2023/day_05/solution.ts

@@ -0,0 +1,121 @@
+/*
+--- Day 5: If You Give A Seed A Fertilizer ---
+
+You take the boat and find the gardener right where you were told he would be: managing a giant "garden" that looks more to you like a farm.
+
+"A water source? Island Island is the water source!" You point out that Snow Island isn't receiving any water.
+
+"Oh, we had to stop the water because we ran out of sand to filter it with! Can't make snow with dirty water. Don't worry, I'm sure we'll get more sand soon; we only turned off the water a few days... weeks... oh no." His face sinks into a look of horrified realization.
+
+"I've been so busy making sure everyone here has food that I completely forgot to check why we stopped getting more sand! There's a ferry leaving soon that is headed over in that direction - it's much faster than your boat. Could you please go check it out?"
+
+You barely have time to agree to this request when he brings up another. "While you wait for the ferry, maybe you can help us with our food production problem. The latest Island Island Almanac just arrived and we're having trouble making sense of it."
+
+The almanac (your puzzle input) lists all of the seeds that need to be planted. It also lists what type of soil to use with each kind of seed, what type of fertilizer to use with each kind of soil, what type of water to use with each kind of fertilizer, and so on. Every type of seed, soil, fertilizer and so on is identified with a number, but numbers are reused by each category - that is, soil 123 and fertilizer 123 aren't necessarily related to each other.
+
+For example:
+
+seeds: 79 14 55 13
+
+seed-to-soil map:
+50 98 2
+52 50 48
+
+soil-to-fertilizer map:
+0 15 37
+37 52 2
+39 0 15
+
+fertilizer-to-water map:
+49 53 8
+0 11 42
+42 0 7
+57 7 4
+
+water-to-light map:
+88 18 7
+18 25 70
+
+light-to-temperature map:
+45 77 23
+81 45 19
+68 64 13
+
+temperature-to-humidity map:
+0 69 1
+1 0 69
+
+humidity-to-location map:
+60 56 37
+56 93 4
+
+The almanac starts by listing which seeds need to be planted: seeds 79, 14, 55, and 13.
+
+The rest of the almanac contains a list of maps which describe how to convert numbers from a source category into numbers in a destination category. That is, the section that starts with seed-to-soil map: describes how to convert a seed number (the source) to a soil number (the destination). This lets the gardener and his team know which soil to use with which seeds, which water to use with which fertilizer, and so on.
+
+Rather than list every source number and its corresponding destination number one by one, the maps describe entire ranges of numbers that can be converted. Each line within a map contains three numbers: the destination range start, the source range start, and the range length.
+
+Consider again the example seed-to-soil map:
+
+50 98 2
+52 50 48
+
+The first line has a destination range start of 50, a source range start of 98, and a range length of 2. This line means that the source range starts at 98 and contains two values: 98 and 99. The destination range is the same length, but it starts at 50, so its two values are 50 and 51. With this information, you know that seed number 98 corresponds to soil number 50 and that seed number 99 corresponds to soil number 51.
+
+The second line means that the source range starts at 50 and contains 48 values: 50, 51, ..., 96, 97. This corresponds to a destination range starting at 52 and also containing 48 values: 52, 53, ..., 98, 99. So, seed number 53 corresponds to soil number 55.
+
+Any source numbers that aren't mapped correspond to the same destination number. So, seed number 10 corresponds to soil number 10.
+
+So, the entire list of seed numbers and their corresponding soil numbers looks like this:
+
+seed  soil
+0     0
+1     1
+...   ...
+48    48
+49    49
+50    52
+51    53
+...   ...
+96    98
+97    99
+98    50
+99    51
+
+With this map, you can look up the soil number required for each initial seed number:
+
+    Seed number 79 corresponds to soil number 81.
+    Seed number 14 corresponds to soil number 14.
+    Seed number 55 corresponds to soil number 57.
+    Seed number 13 corresponds to soil number 13.
+
+The gardener and his team want to get started as soon as possible, so they'd like to know the closest location that needs a seed. Using these maps, find the lowest location number that corresponds to any of the initial seeds. To do this, you'll need to convert each seed number through other categories until you can find its corresponding location number. In this example, the corresponding types are:
+
+    Seed 79, soil 81, fertilizer 81, water 81, light 74, temperature 78, humidity 78, location 82.
+    Seed 14, soil 14, fertilizer 53, water 49, light 42, temperature 42, humidity 43, location 43.
+    Seed 55, soil 57, fertilizer 57, water 53, light 46, temperature 82, humidity 82, location 86.
+    Seed 13, soil 13, fertilizer 52, water 41, light 34, temperature 34, humidity 35, location 35.
+
+So, the lowest location number in this example is 35.
+
+What is the lowest location number that corresponds to any of the initial seed numbers?
+
+*/
+
+type SeedToSoil = {
+  [seed: number]: number
+}
+
+
+
+export function part1_solver(lines: string[]): number {
+  return 1;
+}
+
+
+/*
+
+*/
+export function part2_solver(lines: string[]): number {
+  return 1;
+}

_utils/index.ts

@@ -48,9 +48,9 @@ export function group<T>(
       return isCutoffPoint
         ? [...previousValue, includeCutoffValue ? [currentValue] : []]
         : [
-            ...previousValue.slice(0, -1),
+          ...previousValue.slice(0, -1),
-            [...previousValue[previousValue.length - 1], currentValue],
+          [...previousValue[previousValue.length - 1], currentValue],
-          ];
+        ];
     },
     [[]] as T[][]
   );
@@ -63,3 +63,30 @@ export function sum(a: number, b: number): number {
 export function emptyLines(line?: string): boolean {
   return !!line;
 }
+
+export function unique<T>(arr: T[]): T[] {
+  return arr.reduce<T[]>((res, current) => {
+    if (res.includes(current)) {
+      return res;
+    } else {
+      return [...res, current];
+    }
+  }, []);
+}
+
+export function allIndicesOf(s: string, search: string): number[] {
+  return unique(
+    s
+      .split("")
+      .reduce((results, _, index) => [...results, s.indexOf(search, index)], [])
+  ).filter((x: number) => x >= 0);
+}
+
+export function extractNumbers(s: string): number {
+  const res = s.replaceAll(/[^\d]/g, "").trim()
+  if (isNaN(+res)) {
+    throw new Error(`Could not extract numbers from '${s}': got '${res}'`)
+  }
+
+  return +res;
+}

get_input.sh

@@ -1,10 +0,0 @@
-#!/usr/bin/env bash
-
-set -euo pipefail
-
-day=$1
-dir=$(printf "day_%02d" "$day")
-
-mkdir -p "$dir"
-
-curl -H "Cookie: $(cat ./session.cookie)" https://adventofcode.com/2022/day/"$day"/input -o "$dir"/input.txt

package.json

@@ -6,7 +6,8 @@
   "main": "index.ts",
   "scripts": {
     "start": "ts-node-esm index.ts",
-    "test": "jest"
+    "test": "jest $(date +%Y)/day_${1:-$(date +%d)}/solution.test.ts",
+    "test-all": "jest"
   },
   "author": "",
   "license": "ISC",

session.cookie.example

@@ -0,0 +1 @@
+session=<COOKIEHERE>

setup_day.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export PUZZLE_NAME="$1"
+
+export DAY="${2:-$(date +%d)}"
+export DAY_SHORT=$(($DAY))
+
+year=$(date +%Y)
+dir="$year/day_$DAY"
+
+mkdir "$dir"
+
+envsubst < "solution.ts.template" > "$dir/solution.ts"
+envsubst < "solution.test.ts.template" > "$dir/solution.test.ts"
+
+touch "$dir/sample.txt"
+
+curl -H "Cookie: $(cat ./session.cookie)" \
+    "https://adventofcode.com/$year/day/$DAY_SHORT/input" \
+    -o "$dir"/input.txt

solution.test.ts.template

@@ -0,0 +1,28 @@
+import path from "path";
+
+import { readlines } from "../../_utils";
+import { part1_solver, part2_solver } from "./solution";
+
+describe("day $DAY_SHORT: $PUZZLE_NAME, pt 1", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part1_solver(sample)).toBe(-1);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part1_solver(input)).toBe(-1);
+  });
+});
+
+describe("day $DAY_SHORT: $PUZZLE_NAME, pt 2", () => {
+  test("sample input", async () => {
+    const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
+    expect(part2_solver(sample)).toBe(-1);
+  });
+
+  test("submission input", async () => {
+    const input = await readlines(path.resolve(__dirname, "./input.txt"));
+    expect(part2_solver(input)).toBe(-1);
+  });
+});

solution.ts.template

@@ -0,0 +1,14 @@
+/*
+
+*/
+export function part1_solver(lines: string[]): number {
+  return 1;
+}
+
+
+/*
+
+*/
+export function part2_solver(lines: string[]): number {
+  return 1;
+}