2020 day 8

2020/08/part1.js

@@ -0,0 +1,35 @@
+const fs = require('fs');
+
+const data = fs.readFileSync('input.txt', 'utf-8');
+const lines = data.split('\n');
+let instructions = [];
+
+lines.forEach((line, i) => {
+  t = line.split(' ');
+  instructions[i] = [t[0], parseInt(t[1])]
+})
+
+function loop (i, seen, acc) {
+  if (seen.has(i)) {
+    return acc;
+  }
+  seen.add(i);
+  switch (instructions[i][0]) {
+    case 'acc':
+      acc+=instructions[i][1];
+      i ++;
+      break;
+    case 'jmp':
+      i += instructions[i][1];
+      break;
+    case 'nop':
+      i ++;
+      break;
+    default:
+      console.log('something went wrong. got instruction:', instruction[i][0]);
+  }
+  acc = loop(i, seen, acc);
+  return acc;
+}
+
+loop(0, new Set(), 0)