Compilare: user.cpp: In function ‘int main()’: user.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v.size()<=k) ^ user.cpp:69:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n && ans.size()<k;++i) ^ user.cpp:67:11: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<sol<<"\n"; ^