Compilare: user.cpp: In function ‘bool Bfs()’: user.cpp:28:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Graph[X].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:55:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Graph[N].size(); i++) { ^ user.cpp:43:33: 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:44:35: 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:46:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &M); ^ user.cpp:48:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &X, &Y, &Z); ^