arce.cpp: In function `void dfs(int)': arce.cpp:27: warning: comparison between signed and unsigned integer expressions arce.cpp:22: warning: unused variable `__gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > > it' arce.cpp: In function `void bfs(int)': arce.cpp:41: warning: comparison between signed and unsigned integer expressions