Initial commit

2023/day02/day02.ts

@@ -0,0 +1,57 @@
+// const input: string = await Bun.file("input").text();
+import { readFileSync } from "node:fs";
+const input: string = readFileSync("input", "utf8");
+
+type Reveal = {
+  red: number;
+  green: number;
+  blue: number;
+};
+
+type Game = { id: number; reveals: Reveal[] };
+
+function parse_reveal(reveal_str: string): Reveal {
+  let r = { red: 0, green: 0, blue: 0 };
+  reveal_str
+    .split(", ")
+    .map((s) => (r[s.split(" ")[1]] = Number(s.split(" ")[0])));
+  return r;
+}
+
+function parse_game(game_str: string): Game {
+  let [game, reveals] = game_str.split(": ");
+  let game_id = Number(game.split(" ")[1]);
+  let r = reveals.split("; ").map(parse_reveal);
+  return { id: game_id, reveals: r };
+}
+
+let games = input
+  .split("\n")
+  .filter((s) => s.length > 0)
+  .map(parse_game);
+
+let part1 = (games: Game[]): number =>
+  games
+    .filter((g) =>
+      g.reveals.every((r) => r.red <= 12 && r.green <= 13 && r.blue <= 14),
+    )
+    .map((g) => g.id)
+    .reduce((a, b) => a + b);
+
+let part2 = (games: Game[]): number =>
+  games
+    .map((g) =>
+      g.reveals.reduce(
+        (o, r) => ({
+          red: Math.max(o.red, r.red),
+          green: Math.max(o.green, r.green),
+          blue: Math.max(o.blue, r.blue),
+        }),
+        { red: 0, green: 0, blue: 0 },
+      ),
+    )
+    .map((r) => r.red * r.green * r.blue)
+    .reduce((a, b) => a + b);
+
+console.log(part1(games));
+console.log(part2(games));