Compilare: user.cpp: In function ‘void inm(int, int)’: user.cpp:34:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < a[p].size() ; ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:70:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < a[i].size() ; ++j) ^