Compilare: main.cpp: In function 'int main()': main.cpp:10:34: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | #define rep(i,n) for(int i = 0; i<n;i++) ...... 75 | rep(j, out.size()) cout<<out[j]<<' '; | ~~~~~~~~~~~~~ main.cpp:75:13: note: in expansion of macro 'rep' 75 | rep(j, out.size()) cout<<out[j]<<' '; | ^~~