/in/foo.cc: In function 'int ShortestPath(std::vector<std::vector<char> >&, int, int)':
/in/foo.cc:66:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int SelectMax(int, int, int, int)':
/in/foo.cc:133:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^