2024 day 1 deno

2024/day01/day01.ts

@@ -0,0 +1,16 @@
+#!/usr/bin/env -S deno run --allow-read
+const input = await Deno.readTextFile("input");
+const parsedInput = input
+  .split("\n")
+  .map((s) => s.split("   "))
+  .filter((l) => l.length == 2)
+  .map((l) => [parseInt(l[0]), parseInt(l[1])]);
+const left = parsedInput.map((l) => l[0]).sort();
+const right = parsedInput.map((l) => l[1]).sort();
+console.log(
+  left.map((x, i) => Math.abs(x - right[i])).reduce((t, c) => t + c, 0),
+);
+const counts = Object.groupBy(right, (x) => x);
+console.log(
+  left.map((n) => n * (counts[n]?.length || 0)).reduce((t, c) => t + c, 0),
+);