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solution.js
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solution.js
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const fs = require("fs");
const input = fs.readFileSync('input.txt', 'utf8').trimEnd();
const map = input.split('\n').map((line) => line.split(''));
const directions = [
[-1, -1],
[-1, 0],
[-1, 1],
[0, -1],
[0, 1],
[1, -1],
[1, 0],
[1, 1],
];
function part1() {
let totalSum = 0;
for (let row = 0; row < map.length; row++) {
for (let col = 0; col < map[row].length; col++) {
if (/[^\d^.]/.test(map[row][col])) {
for (let [dRow, dCol] of directions) {
if (/\d/.test(map[row + dRow]?.[col + dCol])) {
const digits = [map[row + dRow][col + dCol]];
for (let c = col + dCol - 1; c >= 0; c--) {
if (/\d/.test(map[row + dRow]?.[c])) {
digits.unshift(map[row + dRow][c]);
map[row + dRow][c] = '.';
} else {
break;
}
}
for (let c = col + dCol + 1; c < map[row + dRow]?.length; c++) {
if (/\d/.test(map[row + dRow]?.[c])) {
digits.push(map[row + dRow][c]);
map[row + dRow][c] = '.';
} else {
break;
}
}
totalSum += +digits.join('');
}
}
}
}
}
return totalSum;
}
function part2() {
let totalSum = 0;
for (let row = 0; row < map.length; row++) {
for (let col = 0; col < map[row].length; col++) {
if (/\*/.test(map[row][col])) {
const gears = [];
for (let [dRow, dCol] of directions) {
if (/\d/.test(map[row + dRow]?.[col + dCol])) {
const digits = [map[row + dRow][col + dCol]];
for (let c = col + dCol - 1; c >= 0; c--) {
if (/\d/.test(map[row + dRow]?.[c])) {
digits.unshift(map[row + dRow][c]);
map[row + dRow][c] = '.';
} else {
break;
}
}
for (let c = col + dCol + 1; c < map[row + dRow]?.length; c++) {
if (/\d/.test(map[row + dRow]?.[c])) {
digits.push(map[row + dRow][c]);
map[row + dRow][c] = '.';
} else {
break;
}
}
gears.push(+digits.join(''));
}
}
if (gears.length === 2) {
totalSum += gears[0] * gears[1];
}
}
}
}
return totalSum;
}
console.log('part1: ', part1());
console.log('part2: ', part2());