Compilare: user.cpp: In function ‘int main()’: user.cpp:27:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] forbidden[a][b] = forbidden[b][a] = 1; ^ user.cpp:27:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] forbidden[a][b] = forbidden[b][a] = 1; ^ user.cpp:27:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] forbidden[a][b] = forbidden[b][a] = 1; ^ user.cpp:27:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] forbidden[a][b] = forbidden[b][a] = 1; ^ user.cpp:36:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if ( !forbidden[ sir[i] ][ sir[j] ] ){ ^ user.cpp:36:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] if ( !forbidden[ sir[i] ][ sir[j] ] ){ ^ user.cpp:39:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if ( !forbidden[ sir[i] ][ sir[k] ] ){ ^ user.cpp:39:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] if ( !forbidden[ sir[i] ][ sir[k] ] ){ ^