堆（Heap）是一种特殊的二叉树结构，通常用于实现优先队列。堆算法（Heap Algorithm）利用堆的特性，可以在O(log n)的时间复杂度内插入或删除元素，并在O(1)的时间内获取最大或最小值。 它们解决了什么问题？

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