Compilare: user.cpp: In member function ‘void PushRelabel::Relabel(int)’: user.cpp:58:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[v].size(); i++) ^ user.cpp: In member function ‘void PushRelabel::Discharge(int)’: user.cpp:66:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; excess[v] > 0 && i < G[v].size(); i++) Push(G[v][i]); ^ user.cpp: In member function ‘LL PushRelabel::GetMaxFlow(int, int)’: user.cpp:80:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[s].size(); i++) { ^ user.cpp:93:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[s].size(); i++) totflow += G[s][i].flow; ^ user.cpp: In function ‘int main()’: user.cpp:99:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in", "r", stdin); ^ user.cpp:100:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.out", "w", stdout); ^