（1）一组记录的关键字序列为（57，90，67，50，51，56），利用堆排序（堆顶元素是最小元素）的方法建立初始堆（要求以完全二叉树描述）。（2）对关键字序列（56，51，71，54，46，106）利用快速排序，以第一个关键字为分割元素，给出经过一次划分后结果。（3）一组记录的关键字序列为（60，47，80，57，39，41，46，30），利用归并排序的方法，分别给出（1，1）归并、（2，

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（1）一组记录的关键字序列为（57，90，67，50，51，56），利用堆排序（堆顶元素是最小元素）的方法建立初始堆（要求以完全二叉树描述）。
（2）对关键字序列（56，51，71，54，46，106）利用快速排序，以第一个关键字为分割元素，给出经过一次划分后结果。
（3）一组记录的关键字序列为（60，47，80，57，39，41，46，30），利用归并排序的方法，分别给出（1，1）归并、（2，2）归并、（4，4）归并的结果序列。

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