1 files changed, 22 insertions, 0 deletions
diff --git a/src/2020/day4/aoc.cpp b/src/2020/day4/aoc.cpp
index 849bad9..171f42e 100644
--- a/src/2020/day4/aoc.cpp
+++ b/src/2020/day4/aoc.cpp
@@ -2,4 +2,26 @@
 
 namespace aoc2020 {
 
+int day4(line_view file) {
+  const char* p1 = file.line;
+  const char* p2 = file.line + file.length;
+  const char* p = p1;
+  int total{0};
+  while (p < p2) {
+    if (*p == '\n' && *(p + 1) == '\n') {
+      passwort pass{p1, p};
+      // std::cout << pass << std::endl;
+      if (pass.is_valid()) {
+        total++;
+      }
+      p1 = p + 2;
+    }
+    p++;
+  }
+  if (passwort{p1, p}.is_valid()) {
+    total++;
+  }
+  return total;
 }
+
+} // namespace aoc2020