Compilare: user.cpp: In function ‘void maxFlow(int, int)’: user.cpp:40:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[dest].size(); i++) { ^ user.cpp: In function ‘void BFS(int)’: user.cpp:61:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) { ^ user.cpp: In function ‘void Read()’: user.cpp:25:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in", "rt", stdin); freopen("maxflow.out", "wt", stdout); ^ user.cpp:25:81: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in", "rt", stdin); freopen("maxflow.out", "wt", stdout); ^ user.cpp:26:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:28:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int a, b, c; scanf("%d%d%d", &a, &b, &c); ^