Compilare: main.cpp: In function 'int main()': main.cpp:32:92: warning: format '%d' expects argument of type 'int', but argument 2 has type '__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >::difference_type {aka long int}' [-Wformat=] printf("%d\n",upper_bound(nr.begin(),nr.end(),b)-lower_bound(nr.begin(),nr.end(),a)); ^ main.cpp:9:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("asi.in","r",stdin); ^ main.cpp:10:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("asi.out","w",stdout); ^ main.cpp:28:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&q); ^ main.cpp:31:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&a,&b); ^