Compilare: user.cpp: In function ‘int main()’: user.cpp:30:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(index[j] < v[j].size() && v[j][index[j]] < mi) ^ user.cpp:36:19: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] ++index[p]; ^