1 files changed, 35 insertions, 2 deletions
diff --git a/src/2015/day19/aoc.h b/src/2015/day19/aoc.h
index b357ab1..a89aa09 100644
--- a/src/2015/day19/aoc.h
+++ b/src/2015/day19/aoc.h
@@ -2,6 +2,8 @@
 
 #include "common.h"
 #include <map>
+#include <set>
+#include <string>
 #include <vector>
 
 namespace aoc2015 {
@@ -42,11 +44,42 @@ struct molecule {
     }
   }
 
+  std::string apply(const change& c) const noexcept {
+    int len = original.length + c.c.to.length - c.c.from.length + 1;
+    // int len = original.length + 1;
+    char* s = (char*)malloc(len);
+    memset(s, 0x0, len);
+    // const char* ps[] = {original.line, c.c.from.line, c.c.from.line + c.c.from.length, original.line +
+    // original.length};
+    const char* ps[] = {original.line, c.c.from.line, c.c.from.line + c.c.from.length, original.line + original.length};
+    char* p = s;
+    for (size_t i = 0; i < 3; i++) {
+      if (i != 1) {
+        const char* p1 = ps[i];
+        const char* p2 = ps[i + 1];
+        // std::cout << line_view{p1, p2} << std::endl;
+        memcpy(p, p1, p2 - p1);
+        p += (p2 - p1);
+      } else {
+        const char* p1 = c.c.to.line;
+        const char* p2 = c.c.to.line + c.c.to.length;
+        // std::cout << line_view{p1, p2} << std::endl;
+        memcpy(p, p1, p2 - p1);
+        p += (p2 - p1);
+      }
+    }
+    return std::string(s);
+  }
+
   int distinct(const std::vector<change>& vc) const noexcept {
+    std::set<std::string> ss;
     for (auto& c : vc) {
-      std::cout << c.i << ": " << original << " " << (c.c.from.line - original.line) << " " << c.c.to << std::endl;
+      // std::cout << c.i << ": " << original << " " << (c.c.from.line - original.line) << " " << c.c.to << std::endl;
+      auto s = apply(c);
+      // std::cout << "<" << s.length() << ":" << s << ">" << std::endl;
+      ss.insert(s);
     }
-    return 0;
+    return ss.size();
   }
 
   int distinct(const std::map<int, std::vector<change>>& vr) const noexcept {