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// tt表示栈顶 int stk[N], tt = 0;

// 向栈顶插入一个数 stk[ ++ tt] = x;

// 从栈顶弹出一个数 tt -- ;

// 栈顶的值 stk[tt];

// 判断栈是否为空 if (tt > 0) {

}

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