day 1 puzzle 2

day1-puzzle1.ts

@@ -1,6 +1,6 @@
 import fs from "node:fs";
 
-const input = fs.readFileSync("inputs/day1-puzzle1").toString();
+const input = fs.readFileSync("inputs/day1").toString();
 
 const sort = (a: number, b: number) => a - b;
 

day1-puzzle2.ts

@@ -0,0 +1,26 @@
+import fs from "node:fs";
+
+const input = fs.readFileSync("inputs/day1").toString();
+
+const sort = (a: number, b: number) => a - b;
+
+const lists: number[][] = [];
+
+input.split("\n").forEach(line => {
+    line.split(/\s+/g).forEach((i, list) => {
+        lists[list] = lists[list] || [];
+        lists[list].push(Number(i));
+    })
+})
+
+lists.forEach(i => i.sort(sort));
+
+const rows: number[] = [];
+
+lists[0].forEach((a) => {
+    rows.push(a * lists[1].filter(b => a === b).length);
+})
+
+const result = rows.reduce((prev, cur) => prev + cur);
+
+console.log(result);