day 04

1 files changed, 48 insertions, 0 deletions

diff --git a/aoc_2023/day-04/part_1.ts b/aoc_2023/day-04/part_1.ts
new file mode 100644
index 0000000..a026c5e
--- /dev/null
+++ b/aoc_2023/day-04/part_1.ts
@@ -0,0 +1,48 @@
+export const main = async (lines: string[]): Promise<number | string> => {
+  let sum = 0;
+
+  for (const line of lines) {
+    const [cardS, numbersS] = line.split(" | ");
+    const cardNums = cardS
+      .split(":")
+      .at(1)!
+      .split(" ")
+      .filter((x) => x)
+      .map((x) => x.trim())
+      .map((x) => parseInt(x));
+    const winners = numbersS
+      .split(" ")
+      .filter((x) => x)
+      .map((x) => x.trim())
+      .map((x) => parseInt(x));
+
+    console.log(cardNums, winners);
+
+    const winnerSet = new Set<number>(winners);
+    const wins = cardNums.reduce(
+      (acc, x) => acc + (winnerSet.has(x) ? 1 : 0),
+      0
+    );
+    if (wins > 0) sum += Math.pow(2, wins - 1);
+  }
+
+  return sum;
+};
+
+//
+
+const isrun = process.argv.length > 1 && process.argv[1] === import.meta.path;
+if (isrun) {
+  const file = Bun.file("./problem.txt");
+  const text = await file.text();
+  const lines = text.split("\n").filter((x) => x && x.length);
+
+  console.log("=== COMPUTATION ===\n");
+
+  const answer = await main(lines);
+
+  console.log("\n=== /COMPUTATION ===\n");
+
+  console.log("=== ANSWER TO P1 ===");
+  console.log(answer);
+}