Compilare: main.cpp: In function 'bool DF()': main.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v[tp].size();++j ) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[n].size();j++) ~^~~~~~~~~~~~ main.cpp:47:36: 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); ^ main.cpp:48:38: 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); ^ main.cpp:49:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ main.cpp:53:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&j,&k,&c); ^