From 763be9b5899eda3997c5c45c6cbee64960e64334 Mon Sep 17 00:00:00 2001
From: Sqaaakoi <sqaaakoi-git@sqaaakoi.xyz>
Date: Mon, 2 Dec 2024 22:49:37 +1100
Subject: [PATCH] Day 2 Puzzle 1

---
 day2.ts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 day2.ts

diff --git a/day2.ts b/day2.ts
new file mode 100644
index 0000000..5750c3e
--- /dev/null
+++ b/day2.ts
@@ -0,0 +1,22 @@
+import fs from "node:fs";
+
+const input = fs.readFileSync("inputs/day2").toString();
+
+const rows = input.split("\n").filter(Boolean);
+
+function safe_levels(_row: number[]) {
+    const row = [..._row];
+    while (row.length > 1) {
+        const diff = row[1] - row[0];
+        if (diff > 3 || diff < 1) return false;
+        row.shift();
+    }
+    return true;
+}
+
+function puzzle1() {
+    return rows.map((row) => row.split(/\s+/g).map(i => +i))
+    .filter(row => safe_levels(row) || safe_levels(row.toReversed())).length;
+}
+
+console.log("Puzzle 1", puzzle1());