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advent-of-code-2022
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compare: Aelita4:69b0f79024f63591c00d49719aae82fdd538f0f9
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67
day09/index.js
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@ -1,67 +0,0 @@
import { readFileSync } from "fs";
const input = readFileSync("movements.txt", "utf-8");
function isTailAdjacentToHead(head, tail) {
if(Math.abs(tail.x - head.x) > 1) return false;
if(Math.abs(tail.y - head.y) > 1) return false;
return true;
}
const initX = 11, initY = 5;
const rope = [
{ x: initX, y: initY },
{ x: initX, y: initY },
{ x: initX, y: initY },
{ x: initX, y: initY },
{ x: initX, y: initY },
{ x: initX, y: initY },
{ x: initX, y: initY },
{ x: initX, y: initY },
{ x: initX, y: initY },
{ x: initX, y: initY }
];
const visited = new Map();
input.split('\n').forEach(line => {
const operations = line.split(' ');
let x = 0, y = 0;
switch(operations[0]) {
case "U":
y++;
break;
case "D":
y--;
break;
case "L":
x--;
break;
case "R":
x++;
break;
}
for(let i = 0; i < parseInt(operations[1]); i++) {
rope[0].x += x;
rope[0].y += y;
for(let ropeIndex = 1; ropeIndex < rope.length; ropeIndex++) {
if(!isTailAdjacentToHead(rope[ropeIndex - 1], rope[ropeIndex])) {
if(rope[ropeIndex - 1].x !== rope[ropeIndex].x && rope[ropeIndex - 1].y !== rope[ropeIndex].y) {
rope[ropeIndex].x += (rope[ropeIndex - 1].x - rope[ropeIndex].x) > 0 ? 1 : -1;
rope[ropeIndex].y += (rope[ropeIndex - 1].y - rope[ropeIndex].y) > 0 ? 1 : -1;
} else if(rope[ropeIndex - 1].x === rope[ropeIndex].x) {
rope[ropeIndex].y += (rope[ropeIndex - 1].y - rope[ropeIndex].y) > 0 ? 1 : -1;
} else if(rope[ropeIndex - 1].y === rope[ropeIndex].y) {
rope[ropeIndex].x += (rope[ropeIndex - 1].x - rope[ropeIndex].x) > 0 ? 1 : -1;
}
}
}
visited.set(`${rope[rope.length - 1].x}:${rope[rope.length - 1].y}`, true);
}
});
console.log(visited.size);

2000
day09/movements.txt
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