Compilare: user.cpp: In function ‘int find(int)’: user.cpp:12:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[mo].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();++j) ^