2022/1/14 8:24:01 python 字数 2967 阅读 573 来源 www.jb51.cc/python
l = [1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31]def find(l ,aim ,start = 0,end = None):end = len(l) if end is None else end #end的问题解决mid_index = ( end - start )//2 + start #中间数下标问题的解决if start <=end: #找不到问题的解决if l[mid_index]<aim:return find(l ,aim ,start = mid_index+1,end = end )elif l[mid_index]>aim:return find(l,aim, start = start,end = mid_index - 1)else:return mid_indexelse:return '没有找到'#l = [1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31]ret = find(l,27)print(ret)#注意，是len(l)，还有end = end ,start = start，+1-1要注意
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l = [1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31 find(l,aim,start = 0,end == len(l) end None end 问题解决
mid_index = ( end - start )//2 + start 解决
start <=end: 解决
l[mid_index]< find(l,start = mid_index+1,end = l[mid_index]> find(l,start = start,end = mid_index - 1
ret = find(l,27
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