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基数排序 - Wikipedia

基数排序

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基数排序(Radix Sort)是一种排序算法,它是这样实现的:
假设需排序数列的取值范围从1...k,我们于是建一个K+1元的数组 a[],并赋初值为0,然后便开始排序工作:

  1. 按输入顺序读入数列,如果所读的元素为i(1<=i<=k),我们就将a[i]的值加一,这样直到读完所有的元素。
  2. 读出元素并排序:我们遍历整个数组,如果a[i]=j(j>=0),我们就输出j次i(表示元素i在原先数列中出现了j次),这样输出的序列就是已排序的。
  3. 由于一般排序算法涉及到元素之间的比较,如果化成比较可以知道,这样的排序算法复杂度的下限是O(N*lnN),而计数排序没有比较元素,所以所需排序时间就少了,我们可以看到计数排序的复杂度为O(n+k),其中k(k的定义同上)为合并排列所需的时间,是个常数。
  4. 此算法适合所需排列的元素取值范围不大的情况下,否则会造成空间的消耗,比如,一共100个元素,其取值范围从1-100000,显然这个时候用基数排序是不合适的。
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