Compilare: user.cpp: In function ‘int main()’: user.cpp:50:103: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(vector<int>::iterator it1=g1[*it].begin();it1!=g1[*it].end();it1++) vaz1[sir[*it1]]=1; ^ user.cpp:28:11: warning: unused variable ‘nr’ [-Wunused-variable] int n,nr=0; ^ user.cpp:42:9: warning: unused variable ‘k’ [-Wunused-variable] int k=0; ^ user.cpp:26:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pmk.in", "r", stdin); ^ user.cpp:27:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pmk.out", "w", stdout); ^ user.cpp:29:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:30:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=0;i<n;i++) scanf("%d",&v[i]); ^