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文章作者：Tyan
博客：noahsnail.com | CSDN | 简书
1. Description
Guess Number Higher or Lower
2. Solution
解析：二分查找问题。
class Solution:
def guessNumber(self, n):
left = 1
right = n
while left <= right:
mid = (left + right) // 2
result = guess(mid)
if result > 0:
left = mid + 1
elif result < 0:
right = mid - 1
else:
return mid
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