Compilare: user.cpp: In function ‘void flux()’: user.cpp:38:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:67:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.in","r",stdin); ^ user.cpp:68:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.out","w",stdout); ^ user.cpp:69:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd%hd%hd%hd",&N,&M,&S,&D); ^ user.cpp:74:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd%hd%hd%hd",&x,&y,&capacitate,&cost); ^