元素A、B、C依次进栈,中间允许出栈,若出栈序列为BCA,经过栈的操作是()
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元素A、B、C依次进栈,中间允许出栈,若出栈序列为BCA,经过栈的操作是()
A.pushpoppuchpoppushpop
B.pushpushpushpoppoppop
C.pushpoppushpushpoppop
D.pushpushpoppushpoppop
参考答案: