Compilare: user.cpp: In function ‘int main()’: user.cpp:89:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v.size();i++){ ~^~~~~~~~~ user.cpp:105:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j++;j<v[l].size();j++) ~^~~~~~~~~~~~ user.cpp:115:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j++;j<v[l].size();j++) ~^~~~~~~~~~~~ user.cpp:127:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ans.size();i++) ~^~~~~~~~~~~