Day 1

2024/01/index.ts

@@ -0,0 +1,46 @@
+const fs = require('fs');
+const _ = require('lodash');
+
+const input = fs.readFileSync(__dirname + '/input.txt', 'utf8');
+
+const arr1: Array<number> = [];
+const arr2: Array<number> = [];
+
+input.split("\n").forEach((n: string) => {
+    if (n.match('^\s*$')) {
+        return;
+    }
+    const ns = n.split('   ');
+    arr1.push(parseInt(ns[0]));
+    arr2.push(parseInt(ns[1]));
+});
+
+// Part 1
+// arr1.sort();
+// arr2.sort();
+
+// let sum = 0;
+
+// arr1.forEach((v, k) => {
+//     sum += Math.max(v, arr2[k]) - Math.min(v, arr2[k]);
+// });
+
+// console.log(sum);
+
+const map: { [key: number]: number } = {};
+
+arr2.forEach((v) => {
+    if (typeof map[v] === 'undefined') {
+        map[v] = 1;
+    } else {
+        map[v]++;
+    }
+});
+
+let score = 0;
+
+arr1.forEach((v) => {
+    score += (v * (map[v] || 0));
+});
+
+console.log(score);