12.19 栈的表示和实现
链栈
入栈
出栈
if (S == NULL) return ERROR; e = S->data; p = S; S = S->next; delete p; return OK;
取栈顶元素
if (S != NULL) return S->data;
if (S == NULL) return ERROR; e = S->data; p = S; S = S->next; delete p; return OK;
if (S != NULL) return S->data;
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