Compilare: user.cpp: In function ‘int main()’: user.cpp:40:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ^ user.cpp:38:21: warning: unused variable ‘w’ [-Wunused-variable] int w=c.front(); ^ user.cpp:66:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[v2[k]].size();i++) ^ user.cpp:77:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ^ user.cpp:75:25: warning: unused variable ‘w’ [-Wunused-variable] int w=c.front(); ^