目录一、栈1.1 栈的特性：1.2 栈的基本操作：1.3 代码示例：二、队列2.1 队列的特性：2.2 队列的基本操作：2.3 队列的应用：2.4 代码示例：三、应用场景3.1 队列的应用场景：3.2 栈的应用场景：四、总结一、栈
I display elements in a hierarchy, clicking one displays the next set of elements in the hirearchy. Each element has a tag called \"level\" which has some value which is 1-.... (whatever the number of
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