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part-one.js
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part-one.js
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const fs = require('fs');
const path = require('path');
let raw_input = fs.readFileSync(path.resolve(__dirname, './input.txt'), 'utf8');
// Last filter is to remove any empty lines
let input = raw_input.split('\n').filter(n => n);
/**
* Represent the fabric as a 2-dimensional array of zeroes,
* and just loop through all the possible cuts and increment
* each coordinate wherever the area may lie. Next, loop back
* through our 2-d array and count how many values are greater
* than 1, and we'll have our answer.
*/
const FABRIC_SIZE = 1000;
let fabric = Array(FABRIC_SIZE)
.fill()
.map(row => Array(FABRIC_SIZE).fill(0));
// @example `#22 @ 433,548: 22x20`
const cut_regexp = /^#(\d+) @ (\d+),(\d+): (\d+)x(\d+)$/;
input.forEach(cut => {
// id, left_offset, top_offset, width, & height are all integers, so parse them after the match
let [line, id, left_offset, top_offset, width, height] = Array.from(cut_regexp.exec(cut)).map(
(v, i) => (i === 0 ? v : parseInt(v))
);
for (let w = 0; w < width; w++) {
for (let h = 0; h < height; h++) {
// Increment the fabric coordinate by 1
fabric[left_offset + w][top_offset + h] += 1;
}
}
});
// Next, loop through fabric and count how many spots are greater than 1
let spots_overlapping = 0;
fabric.forEach(row => {
row.forEach(cell => {
if (cell > 1) {
spots_overlapping++;
}
});
});
console.log(`There are ${spots_overlapping} spots overlapping`);