03/2024

Author: breadadams

2024/03/index.ts

@@ -0,0 +1,70 @@
+import { getPuzzle } from "../../utils";
+
+const puzzleInput = getPuzzle(__dirname).trim();
+
+const sumMuls = (input: string) => {
+  return input.match(/mul\((\d+,\d+)\)/gm).reduce((acc, mul) => {
+    const [num1, num2] = mul.replace("mul(", "").replace(")", "").split(",");
+
+    return acc + parseInt(num1) * parseInt(num2);
+  }, 0);
+};
+
+// Part 1
+(() => {
+  console.time("part 1");
+  const total = sumMuls(puzzleInput);
+  console.log("part1 total ::", total);
+  console.timeEnd("part 1");
+})();
+
+// Part 2
+(() => {
+  console.time("part 2");
+  const puzzle = puzzleInput.replaceAll("\n", "");
+
+  const DO_OPERATOR = "do()";
+  const DONT_OPERATOR = "don't()";
+
+  const DO_KEYWORD = "%%DO%%";
+  const DONT_KEYWORD = "%%DON'T%%";
+
+  const withDoesAndDonts = puzzle
+    .split(DONT_OPERATOR)
+    .flatMap((entry) => [entry, DONT_KEYWORD])
+    .slice(0, -1)
+    .flatMap((entry) => {
+      if (entry === DONT_KEYWORD) {
+        return entry;
+      }
+
+      if (entry.includes(DO_OPERATOR)) {
+        return entry
+          .split(DO_OPERATOR)
+          .flatMap((subEntry) => [subEntry, DO_KEYWORD])
+          .slice(0, -1);
+      }
+
+      return entry;
+    });
+
+  let enabled = true;
+  let newPuzzle = "";
+
+  for (let i = 0; i < withDoesAndDonts.length; i++) {
+    const entry = withDoesAndDonts[i];
+
+    if (entry === DO_KEYWORD) {
+      enabled = true;
+    } else if (entry === DONT_KEYWORD) {
+      enabled = false;
+    } else if (enabled) {
+      newPuzzle += entry;
+    }
+  }
+
+  const total = sumMuls(newPuzzle);
+
+  console.log("part2 total ::", total);
+  console.timeEnd("part 2");
+})();

README.md

@@ -6,6 +6,7 @@
 
 |                    Day                    | Part 1 | Part 2 |
 | :---------------------------------------: | :----: | :----: |
+| [03](https://adventofcode.com/2024/day/3) |   ✅   |   ✅   |
 | [02](https://adventofcode.com/2024/day/2) |   ✅   |   ✅   |
 | [01](https://adventofcode.com/2024/day/1) |   ✅   |   ✅   |