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注意:二分查找算法针对的是有序的数据集
__author__ = "PoHu"
__copyright__ = "PoHu 2018"
__version__ = "1.0.0"
__license__ = "Henu"
# 今天给大家介绍一个最简单的算法:二分查找算法
def binary_search(list, item):
low = 0
high = len(list) - 1
while low <= high:
mid = (low + high) // 2
guess = list[mid]
if guess == item:
return mid
if guess > item:
high = mid - 1
else:
low = mid + 1
return None
my_list = [1, 3, 5, 7, 9]
print(binary_search(my_list, 3))
print(binary_search(my_list, -1))