Compilare: user.cpp: In function ‘void Read()’: user.cpp:26:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void FormB1()’: user.cpp:36:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[b[i]]++; ^ user.cpp:40:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[a[i]] == 0) ok = 0; ^ user.cpp:44:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[a[i]]--; ^ user.cpp: In function ‘void FormB2()’: user.cpp:72:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[b[i]]++; ^ user.cpp:76:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[a[i]] == 0) ok = 0; ^ user.cpp:80:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[a[i]]--; ^