Compilare: user.cpp: In function ‘int main()’: user.cpp:62:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vv.size();++j) ^ user.cpp:66:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vv1.size();++j) ^ user.cpp:71:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vv.size();++j) ^ user.cpp:78:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vv.size();++j) ^ user.cpp:81:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vv1.size();++j) ^