day 3

2024/3.2.ts

@@ -0,0 +1,25 @@
+import fs from "node:fs"
+
+const input = fs.readFileSync("./2024/inputs/3").toString()
+
+const groups = Array.from(input.matchAll(/(?<dont>don't\(\))|(?<do>do\(\))|(?<mul>mul\((\d{1,3}),(\d{1,3})\))/gm))
+let enabled = true
+let result = 0
+for (const g of groups) {
+    if (!g.groups) {
+        continue
+    }
+    if (g.groups["dont"]) {
+        enabled = false
+        continue
+    }
+    if (g.groups["do"]) {
+        enabled = true
+        continue
+    }
+    if (enabled) {
+        result += (Number(g[4]) * Number(g[5]))
+    }
+
+}
+console.log(result)