1 files changed, 29 insertions, 1 deletions
diff --git a/src/2017/day7/aoc.h b/src/2017/day7/aoc.h
index 1f1d643..f3b9104 100644
--- a/src/2017/day7/aoc.h
+++ b/src/2017/day7/aoc.h
@@ -1,5 +1,33 @@
 #pragma once
 #include "common.h"
+#include <vector>
 
 namespace aoc2017 {
-}
+
+struct disc {
+  line_view name;
+  int weight;
+  std::vector<disc*> subs;
+  const char* xp = nullptr;
+
+  const char* get_number(const char* p, int* d) {
+    *d = 0;
+    while (*p >= '0' && *p <= '9') {
+      *d = *d * 10 + *p - '0';
+      p++;
+    }
+    return p;
+  }
+
+  disc(line_view lv, const char* p) {
+    name = {lv.line, p - 1};
+    p = get_number(p + 1, &weight) + 5;
+    if (p < lv.line + lv.length) {
+      xp = p;
+    }
+  }
+};
+
+void day7(line_view, char[]);
+
+} // namespace aoc2017