1 files changed, 28 insertions, 0 deletions
diff --git a/src/2020/day8/aoc.cpp b/src/2020/day8/aoc.cpp
index 849bad9..830141a 100644
--- a/src/2020/day8/aoc.cpp
+++ b/src/2020/day8/aoc.cpp
@@ -1,5 +1,33 @@
 #include "aoc.h"
+#include <vector>
 
 namespace aoc2020 {
 
+static void run(size_t index, std::vector<code>& cs, int* accumlator) {
+  auto& code = cs[index];
+  if (code.executed == 0) {
+    size_t next = index + 1;
+    if (code.type == acc) {
+      *accumlator += code.value;
+    }
+    if (code.type == jmp) {
+      next = index + code.value;
+    }
+    code.executed += 1;
+    run(next, cs, accumlator);
+  }
 }
+
+int day8(line_view file) {
+  std::vector<code> cs;
+  int accumlator = 0;
+  per_line(file, [&cs](line_view lv) {
+    cs.emplace_back(lv);
+    return true;
+  });
+
+  run(0, cs, &accumlator);
+  return accumlator;
+}
+
+} // namespace aoc2020