Day 14

2024/14/index.ts

@@ -0,0 +1,58 @@
+const fs = require('fs');
+
+const input = fs.readFileSync(__dirname + '/input.txt', 'utf8');
+
+interface Coord {
+    x: number,
+    y: number,
+}
+
+interface Bot {
+    pos: Coord,
+    vel: Coord,
+}
+
+const bots: Array<Bot> = [];
+
+input.split("\n").forEach((line: string) => {
+    const matches = line.match(/p=(-?\d+),(-?\d+) v=(-?\d+),(-?\d+)/);
+    if (!matches) {
+        return;
+    }
+    bots.push({
+        pos: { x: parseInt(matches[1]), y: parseInt(matches[2]) },
+        vel: { x: parseInt(matches[3]), y: parseInt(matches[4]) },
+    });
+});
+
+const width = 101;
+const height = 103;
+
+const seconds = 100;
+
+const quads = [0, 0, 0, 0];
+
+bots.forEach((bot) => {
+    let newX = (bot.pos.x + (bot.vel.x * seconds)) % width;
+    if (newX < 0) {
+        newX = width + newX;
+    }
+    bot.pos.x = newX;
+    let newY = (bot.pos.y + (bot.vel.y * seconds)) % height;
+    if (newY < 0) {
+        newY = height + newY;
+    }
+    bot.pos.y = newY;
+    if (newX < (width - 1) / 2 && newY < (height - 1) / 2) {
+        quads[0]++;
+    } else if (newX > (width - 1) / 2 && newY < (height - 1) / 2) {
+        quads[1]++;
+    } else if (newX < (width - 1) / 2 && newY > (height - 1) / 2) {
+        quads[2]++;
+    } else if (newX > (width - 1) / 2 && newY > (height - 1) / 2) {
+        quads[3]++;
+    }
+});
+
+console.log(quads);
+console.log(quads.reduce((c, n) => c * n, 1));

2024/14/index2.ts

@@ -0,0 +1,80 @@
+const fs = require('fs');
+
+const input = fs.readFileSync(__dirname + '/input.txt', 'utf8');
+
+interface Coord {
+    x: number,
+    y: number,
+}
+
+interface Bot {
+    pos: Coord,
+    vel: Coord,
+}
+
+const bots: Array<Bot> = [];
+
+input.split("\n").forEach((line: string) => {
+    const matches = line.match(/p=(-?\d+),(-?\d+) v=(-?\d+),(-?\d+)/);
+    if (!matches) {
+        return;
+    }
+    bots.push({
+        pos: { x: parseInt(matches[1]), y: parseInt(matches[2]) },
+        vel: { x: parseInt(matches[3]), y: parseInt(matches[4]) },
+    });
+});
+
+const width = 101;
+const height = 103;
+
+let seconds = 0;
+
+function printBots() {
+    const botRows: Array<Array<string>> = [];
+    for (let y = 0; y < height; y++) {
+        botRows[y] = [];
+        for (let x = 0; x < width; x++) {
+            botRows[y][x] = ' ';
+        }
+    }
+
+    bots.forEach((bot) => {
+        botRows[bot.pos.y][bot.pos.x] = '.';
+    });
+
+    console.log(botRows.map((r) => r.join('')).join("\n"));
+    console.log(seconds);
+}
+printBots();
+
+function sleep() {
+    const promise: Promise<void> = new Promise((resolve) => {
+        setTimeout(() => resolve(), 100);
+    });
+    return promise;
+}
+
+async function go() {
+    while (true) {
+        seconds++;
+        bots.forEach((bot) => {
+            let newX = (bot.pos.x + (bot.vel.x)) % width;
+            if (newX < 0) {
+                newX = width + newX;
+            }
+            bot.pos.x = newX;
+            let newY = (bot.pos.y + (bot.vel.y)) % height;
+            if (newY < 0) {
+                newY = height + newY;
+            }
+            bot.pos.y = newY;
+        });
+        if ((seconds - 72) % 103 === 0) {
+            printBots();
+            await sleep();
+        }
+    }
+}
+
+go();