Compilare: user.cpp: In function ‘void Del(int, int)’: user.cpp:12:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:79:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v2[x].size();j++) ^ user.cpp:89:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v2[y].size();j++) ^