Compilare: user.cpp: In function ‘long int dfs(long int, long int)’: user.cpp:25:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<H[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:51:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<R.size();i++) ^ user.cpp:35:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("iepuri2.in","r",stdin); ^ user.cpp:36:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld",&n,&k); ^ user.cpp:43:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld",&x,&y); ^