Add '2020/' from commit 'aaabfa90c9033044d0a9d5fe6776b718711ef46c'

git-subtree-dir: 2020
git-subtree-mainline: ab8f135946
git-subtree-split: aaabfa90c9

2020/08/part1.js

@@ -0,0 +1,38 @@
+const fs = require('fs');
+
+function parseLine(line) {
+  let [ op, offset ] = line.split(' ');
+
+  return { op: op, offset: Number(offset), visited: false };
+}
+
+fs.readFile('input', (err, data) => {
+  if (err) throw err;
+  let program = data.toString().split("\n").map( parseLine ).flat();
+
+  let acc = 0;
+  let pc = 0;
+
+  while (true) {
+    let insn = program[pc];
+    if (insn.visited) {
+      console.log(acc);
+      break;
+    }
+
+    insn.visited = true;
+
+    switch (insn.op) {
+    case 'nop':
+      pc++;
+      break;
+    case 'jmp':
+      pc = pc + insn.offset;
+      break;
+    case 'acc':
+      acc = acc + insn.offset;
+      pc++;
+      break;
+    }
+  }
+});