本文实例讲述了Python排序搜索基本算法之归并排序。分享给大家供大家参考,具体如下:
归并排序最令人兴奋的特点是:不论输入是什么样的,它对N个元素的序列排序所用时间与NlogN成正比。代码如下:
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# coding:utf-8 def mergesort(seq): if len (seq)< = 1 : return seq mid = int ( len (seq) / 2 ) left = mergesort(seq[:mid]) right = mergesort(seq[mid:]) return merge(left,right) def merge(left,right): result = [] i,j = 0 , 0 while i< len (left) and j< len (right): if left[i]< = right[j]: result.append(left[i]) i + = 1 else : result.append(right[j]) j + = 1 result + = left[i:] result + = right[j:] return result if __name__ = = '__main__' : print ( "服务器之家测试结果:" ) seq = [ 4 , 5 , 7 , 9 , 7 , 5 , 1 , 0 , 7 , - 2 , 3 , - 99 , 6 ] print (mergesort(seq)) |
运行结果:
希望本文所述对大家Python程序设计有所帮助。
原文链接:http://blog.csdn.net/littlethunder/article/details/9472301