对于初始为空的栈S，入栈序列为a、b、c、d，且每个元素进栈、出栈各1次。若出栈序列的第一个元素为d，则合法的出栈序列为（ ）
- A.d c b a
- B.d a b c
- C.d c a b
- D.d b c a
正确答案及解析
正确答案
解析
题干要求d第一个出栈，所以入栈的次序为a，b，c，d，栈是先进后出的，所以出栈序列为d，c，b，a。
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