Compilare: user.cpp: In function ‘int main()’: user.cpp:37:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] aux[c2[i]].push_back(i+1); ^ user.cpp:41:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(aux[c1[i]].size()>0) ^ user.cpp:43:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[i+1]=aux[c1[i]][0]; ^ user.cpp:44:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] aux[c1[i]].pop_front(); ^