Compilare: user.cpp: In member function ‘void PushRelabel::Relabel(int)’: user.cpp:56:35: 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:64:52: 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 ‘int PushRelabel::GetMaxFlow(int, int)’: user.cpp:78:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[s].size(); i++) { ^ user.cpp:91:35: 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:97:36: 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:98:38: 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); ^ user.cpp:100:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:105:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a, &b, &c); ^