start day 3
This commit is contained in:
alex
parent
191308edb3
commit
9a03d756b6
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...*.............................117*...........459........767*648....#.........*...................................$...&..=................
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....970.........368.124.+............57................653...........723.....366....*443..60.........536....441....45..879.....789...*......
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.............348.362............607.....889.....#........*....*........*......$904................694...............................241.....
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....955........*.....559*792............................307..25.........449..............*751.404.....134.....841...........................
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..................921..151......................983...............582......983.690.......213.137.268.............*..............24$.........
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467..114..
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...*......
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..35..633.
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......#...
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617*......
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.....+.58.
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..592.....
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......755.
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...$.*....
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.664.598..
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123.456...
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...*......
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..........
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123*456...
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..........
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..123*....
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......456
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import path from "path";
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import { readlines } from "../../_utils";
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import { part1_solver, part2_solver } from "./solution";
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describe("day 3: gear ratios, pt 1", () => {
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test("sample input", async () => {
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const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
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expect(part1_solver(sample)).toBe(4361);
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});
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test("submission input", async () => {
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const input = await readlines(path.resolve(__dirname, "./input.txt"));
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expect(part1_solver(input)).toBe(553825);
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});
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});
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describe("day 3: gear ratios, pt 2", () => {
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test("sample input", async () => {
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const sample = await readlines(path.resolve(__dirname, "./sample.txt"));
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expect(part2_solver(sample)).toBe(467835);
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const sample2 = await readlines(path.resolve(__dirname, "./sample2.txt"));
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expect(part2_solver(sample2)).toBe(168264);
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});
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test("submission input", async () => {
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const input = await readlines(path.resolve(__dirname, "./input.txt"));
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expect(part2_solver(input)).toBe(82962801);
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});
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});
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/*
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*/
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import { sum } from "../../_utils";
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function isDigit(char: string): boolean {
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return /^\d$/.test(char);
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}
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function isSymbol(char: string): boolean {
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return !isDigit(char) && char !== ".";
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}
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function getCharAt(
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m: string[],
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row: number,
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column: number,
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fallback: string = "."
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): string {
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if (typeof m[row] !== "undefined") {
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return m[row][column] || fallback;
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} else {
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return fallback;
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}
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}
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export function part1_solver(lines: string[]): number {
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// approach:
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// 1. assume all numbers are invalid at first (pending)
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// 2. continuously check the pending numbers to see if they can be moved to valid (a symbol is found)
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// 3. once the iterator is out of range of a number, move it to invalid list
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let valid_part_numbers = [];
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lines.forEach((line, row) => {
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// const elements = line.split(".");
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let column = 0;
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let buffer = "";
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let is_valid = false;
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while (column <= line.length) {
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const current_char = line[column];
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if (isDigit(current_char)) {
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buffer += current_char;
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// check previous row
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const up_left = getCharAt(lines, row - 1, column - 1);
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const up_mid = getCharAt(lines, row - 1, column);
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const up_right = getCharAt(lines, row - 1, column + 1);
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const left = getCharAt(lines, row, column - 1);
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const right = getCharAt(lines, row, column + 1);
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const down_left = getCharAt(lines, row + 1, column - 1);
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const down_mid = getCharAt(lines, row + 1, column);
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const down_right = getCharAt(lines, row + 1, column + 1);
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if (!is_valid) {
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is_valid =
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isSymbol(up_left) ||
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isSymbol(up_mid) ||
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isSymbol(up_right) ||
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isSymbol(left) ||
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isSymbol(right) ||
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isSymbol(down_left) ||
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isSymbol(down_mid) ||
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isSymbol(down_right);
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}
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if (isDigit(right)) {
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column += 1;
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continue;
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} else if (isSymbol(right)) {
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valid_part_numbers.push(buffer);
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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);
|
||||
}
|
||||
Loading…
Reference in New Issue