Compilare: user.cpp: In function ‘int main()’: user.cpp:30:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v.size();++i) printf("%d",v[i]); ^ user.cpp:39:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<v.size();++i) printf("%d",v[i]); ^ user.cpp:11:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("impartire.in","r",stdin); ^ user.cpp:12:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("impartire.out","w",stdout); ^ user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^