uticabadgirl
uticabadgirl
03.08.2021 • 
Mathematics

若元素a, b, c, d, e, f依次进栈,允许进栈、退栈操作交替进行,但不允许连续三次进行退栈操作,则不可能得到的出栈序列是( )。 d, c, e, b, f, a

c, b, d, a, e, f

b, c, a, e, f, d

a, f, e, d, c, b

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