设要排序的数组是A[0]……A[N-1]，首先任意选取一个数据（通常选用第一个数据）作为关键数据，然后将所有比它小的数都放到它前面，所有比它大的数都放到它后面，这个过程称为一趟快速排序。-The array is designed to sort A [0] ... ... A [N-1], first select an arbitrary data (usually the first choice of data) as the key data, and then all the numbers are small, than it put in front of it, all larger than the number of put it all behind, a process known as a trip to quick sort.