Commit 44f1a73e by BellCodeEditor

save project

parent adaf6f8a
Showing with 14 additions and 0 deletions
......@@ -7,3 +7,16 @@ num = random.choice(alist)
# 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
def binary_search(alist,num):
print("目标数字是"+str(num))
minIndex = 0
maxIndex = len(alist)-1
while minIndex <= maxIndex:
mid = (minIndex + maxIndex)//2
if alist[mid] == num:
return mid
elif alist[mid] > num:
maxIndex = mid-1
else:
minIndex = mid+1
return None
print(binbry_search(alist , num))
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