Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:27:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[k].size();i++) ^ user.cpp:28:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(t[a[k][i]]==0 && f[k][a[k][i]]<c[k][a[k][i]]) ^ user.cpp: In function ‘int main()’: user.cpp:52:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[d].size();i++) ^ user.cpp:39:36: 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); ^ user.cpp:40:38: 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); ^ user.cpp:41:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:45:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x,&y,&z); ^