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#ifndef _STACK_H
#define _STACK_H
#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
#include"tree.h"
typedef Node * ElemType;
typedef struct stack{
ElemType data;
struct stack * next;
} stack;
typedef stack * Stack;
bool InitStack(Stack * s);
bool DestroyStack(Stack * s);
bool Push(Stack * s, ElemType n);
bool Pop(Stack * s, ElemType * n);
ElemType GetTop(Stack * s);
bool StackIsEmpty (Stack * s);
#endif
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