Compilare: user.cpp: In function ‘int main()’: user.cpp:87:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (int i = 1;i <= n;++i) ++r[a[i]],--r[b[i]]; ^ user.cpp:87:50: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (int i = 1;i <= n;++i) ++r[a[i]],--r[b[i]]; ^ user.cpp:92:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[b[i]].push(i); ^ user.cpp:94:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[i] = v[a[i]].front(),v[a[i]].pop(); ^ user.cpp:94:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[i] = v[a[i]].front(),v[a[i]].pop(); ^