day 3, 🥱

2024/03/p1/index.js

@@ -1,19 +1,19 @@
-const fs = require('fs');
+const fs = require('node:fs');
 const readline = require('readline');
 
 async function processLineByLine() {
-  const fileStream = fs.createReadStream('input.txt');
+  const fileStream = fs.createReadStream('../input.txt');
 
   const rl = readline.createInterface({
     input: fileStream,
     crlfDelay: Infinity
   });
 
-    let t = 0
+  let t = 0
   for await (const line of rl) {
-      let m = line.match(/mul\([0-9]{1,3}, ?[0-9]{1,3}\)/g);
-      m = m.map(e => e.split('(')[1].split(')')[0].split(','))
-        .forEach(([a,b]) => t+=-a*-b)
+    let m = line.match(/mul\([0-9]{1,3}, ?[0-9]{1,3}\)/g);
+    m = m.map(e => e.split('(')[1].split(')')[0].split(','))
+      .forEach(([a, b]) => t += -a * -b)
   }
   console.log(t);
 }

2024/03/p2/index.js

@@ -0,0 +1,32 @@
+const fs = require('node:fs');
+const readline = require('readline');
+
+async function processLineByLine() {
+  const fileStream = fs.createReadStream('../input.txt');
+
+  const rl = readline.createInterface({
+    input: fileStream,
+    crlfDelay: Infinity
+  });
+
+  let t = 0
+  let foo_do = true;
+  for await (const line of rl) {
+    let m = line.match(/(?:mul\([0-9]{1,3}, ?[0-9]{1,3}\)|do(?:n't)?\(\))/g);
+    m = m.forEach(e => {
+      if(e.startsWith('mul') && foo_do) {
+        let [a,b] = e
+          .split('(')[1]
+          .split(')')[0]
+          .split(',')
+
+        t += -a * -b;
+      }
+      if(e.startsWith('do')) foo_do = true;
+      if(e.startsWith('don')) foo_do = false;
+    })
+  }
+  console.log(t);
+}
+
+processLineByLine();