Compilare: user.cpp: In function ‘int main()’: user.cpp:52:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<v[0].size()&&j<v[1].size()&&v[0][j]==v[1][j]) ~^~~~~~~~~~~~ user.cpp:52:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<v[0].size()&&j<v[1].size()&&v[0][j]==v[1][j]) ~^~~~~~~~~~~~ user.cpp:57:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j< v[0].size() &&j< v[1].size() && v[0][j].second == v[1][j].second) ~^~~~~~~~~~~~~ user.cpp:57:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j< v[0].size() &&j< v[1].size() && v[0][j].second == v[1][j].second) ~^~~~~~~~~~~~~