Your solution has long been been given and will be published quickly. Be sure to do not post precisely the same solution all over again.Nên ?? thu?c ? v? trí d? th?y, d? nh? nh?ng tuy?t ??i ph?i ?? xa t?m v?i c?a tr? nh?.Cho t?p h?p A g?m n ph?n t? (n ? one). M?i k?t qu? c?a s? s?p x?p th? t? n ph?n t? c?a t?p h?p A ???c g?i là m?t hoán v? c?a