問題詳情
【題組】(3) In a stack structure, let u denote a push operation and o denote a pop operation. After a sequenceof stack operations, consisting of 3 pushes and 3 pops, an input sequence 123 may change itsorder. For example, after uouuoo is performed, 123 will become 132. Which sequence(s) cannotbe obtained from input 123 by stack operations?
(A) 213
(B) 231
(C) 312
(D) 321.
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增