NOIP2017 单选题
13.向一个栈顶指针为 hs 的链式栈中插入一个指针 s 指向的结点时，应执行（ ）。
hs->next = s;
s->next = hs; hs = s;
s->next = hs->next; hs->next = s;
s->next = hs; hs = hs->next;
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