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aoc11.js
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aoc11.js
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const fileContent = await Deno.readTextFile('./inputs/day11.txt')
const input = fileContent
.split('\r\n')
.filter(x => x !== '')
.map(x => x.split('').map(Number));
part1();
part2();
function part1() {
let flashes = 0;
for (let i = 0; i < 100; i++) {
for (let y = 0; y < input.length; y++) {
for (let x = 0; x < input[0].length; x++) {
flashSim(x, y);
}
}
for (let y = 0; y < input.length; y++) {
for (let x = 0; x < input[0].length; x++) {
if (input[y][x] > 9) {
input[y][x] = 0;
flashes++;
}
}
}
}
console.log(flashes);
}
function part2() {
for (let i = 0; true; i++) {
for (let y = 0; y < input.length; y++) {
for (let x = 0; x < input[0].length; x++) {
flashSim(x, y);
}
}
let flashesThisCycle = 0;
for (let y = 0; y < input.length; y++) {
for (let x = 0; x < input[0].length; x++) {
if (input[y][x] > 9) {
flashesThisCycle++;
input[y][x] = 0;
}
}
}
if (flashesThisCycle === 100) {
console.log(i + 100); // We already did 100 cycles in part1
break;
}
}
}
function flashSim(x, y) {
if (x < 0 || y < 0 || y >= input.length || x >= input[0].length) {
return;
}
input[y][x]++;
if (input[y][x] > 9 && input[y][x] < 1000) {
input[y][x] = 1000;
flashSim(x - 1, y - 1);
flashSim(x, y - 1);
flashSim(x + 1, y - 1);
flashSim(x - 1, y);
flashSim(x + 1, y);
flashSim(x - 1, y + 1);
flashSim(x, y + 1);
flashSim(x + 1, y + 1);
}
}