Compilare: user.cpp: In function ‘void doit(int)’: user.cpp:15:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int s=0;s<G[n].size();s++) ^ user.cpp: In function ‘int main()’: user.cpp:44:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int r=0;r<G[i].size();r++) ^ user.cpp:48:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int s=0;s<rez.size();s++) ^ user.cpp:29:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fof.in","r",stdin); ^ user.cpp:30:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fof.out","w",stdout); ^ user.cpp:31:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:34:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^