Compilare: main.cpp: In function 'int ask(std::vector<int>)': main.cpp:19:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();i++) cout<<a[i]<<" "; ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cnt==remained_poz.size()) ~~~^~~~~~~~~~~~~~~~~~~~~