Compilare: main.cpp: In function 'int qs(int, std::vector<int>)': main.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ~^~~~~~~~~ main.cpp:22:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k<=L.size()) ~^~~~~~~~~~ main.cpp:24:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(L.size()+E.size()>=k) ~~~~~~~~~~~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:32:12: warning: unused variable 'nr' [-Wunused-variable] int n, nr = 0,k,x; ^~