zuzu.cpp: In function `void DFS(int, int, int)': zuzu.cpp:39: warning: comparison between signed and unsigned integer expressions zuzu.cpp:39: warning: comparison between signed and unsigned integer expressions zuzu.cpp:39: warning: comparison between signed and unsigned integer expressions zuzu.cpp: In function `double solve()': zuzu.cpp:85: warning: comparison between signed and unsigned integer expressions zuzu.cpp:86: warning: comparison between signed and unsigned integer expressions zuzu.cpp:87: warning: comparison between signed and unsigned integer expressions zuzu.cpp:90: warning: comparison between signed and unsigned integer expressions zuzu.cpp:91: warning: comparison between signed and unsigned integer expressions zuzu.cpp:92: warning: comparison between signed and unsigned integer expressions