Compilare: user.cpp: In function ‘void Ford_Fulkerson()’: user.cpp:51:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<G[N].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:123:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<SOL.size(); i++) ^ user.cpp:105:38: 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:106:40: 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:107:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &M); ^ user.cpp:110:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &Mc[i].F, &Mc[i].S, &C); ^