第21176题 单选题
向栈顶指针为hs的链式栈中插入指针为s的结点,应执行的操作是?
A
hs->next = s;
B
s->next = hs;
hs = s;
C
s->next = hs->next;
hs->next = s;
D
s->next = hs;
hs = hs->next;
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