adding day 12 part 2 answer

Author: K20shores

src/day12.cpp

@@ -171,7 +171,7 @@ int main(int argc, char **argv) {
   Data data = parse();
 
   int answer1 = 7670;
-  long answer2 = 0;
+  long answer2 = 157383940585037;
 
   auto first = part1(data);
   auto second = part2(data);