Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:35:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[nod].size();j++) ^ user.cpp:26:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j,nod,nod2; ^ user.cpp: In function ‘int ford_fulkerson()’: user.cpp:56:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[n].size();i++) ^ user.cpp: In function ‘void read()’: user.cpp:13:36: 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:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:17:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d ",&x,&y,&z); ^ user.cpp: In function ‘int main()’: user.cpp:85:38: 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); ^