Compilare: user.cpp: In function ‘bool BFS()’: user.cpp:17:17: warning: suggest parentheses around assignment used as truth value [-Wparentheses] Used[i] = Father[i] = 0; ^ user.cpp:29:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[Node].size(); ++ i) ^ user.cpp: In function ‘void MaxFlow()’: user.cpp:47:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[Sink].size(); ++ i) ^ user.cpp: In function ‘void Mark(bool*, int)’: user.cpp:70:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[Node].size(); ++ i) ^ user.cpp: In function ‘int main()’: user.cpp:103:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Res.size(); ++ i) ^ user.cpp:80:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("critice.in", "r", stdin); ^ user.cpp:81:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("critice.out", "w", stdout); ^ user.cpp:83:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &N, &M); ^ user.cpp:86:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i %i", &X[i], &Y[i], &Z[i]); ^