Compilare: user.cpp: In function ‘int main()’: user.cpp:25:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] {a[t[j]]++; ^ user.cpp:26:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(a[t[j]]%2==0) ^ user.cpp:27:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[t[j]]=0; ^