Compilare: user.cpp: In function ‘int main()’: user.cpp:20:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] fra[a[i]] ++; ^ user.cpp:26:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] frb[b[i]] ++; ^ user.cpp:46:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (frb[a[i]] > 0) ^ user.cpp:49:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] frb[a[i]] --; ^ user.cpp:80:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] frb[b[i]] ++; ^ user.cpp:85:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (frb[a[i]] > 0) ^ user.cpp:88:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] frb[a[i]] --; ^ user.cpp:29:18: warning: unused variable ‘transf’ [-Wunused-variable] bool ok = 0, transf = 0; ^