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We are playing the Guess Game. The game is as follows:

I pick a number from 1 to n. You have to guess which number I picked.

Every time you guess wrong, I'll tell you whether the number is higher or lower.

You call a pre-defined API guess(int num) which returns 3 possible results (-1, 1, or 0):

-1 : My number is lower 1 : My number is higher 0 : Congrats! You got it!

Example :

Input: n = 10, pick = 6Output: 6

思路:依旧是一道二分查找的题.设好left,right.因为一定存在这个pick的数,所以while条件不设置为left<right,直接设为True就可以.

# The guess API is already defined for you.# @param num, your guess# @return -1 if my number is lower, 1 if my number is higher, otherwise return 0# def guess(num):class Solution(object):    def guessNumber(self, n):        """        :type n: int        :rtype: int        """        left,right=1,n                while 1:            mid = (left + right)//2                        if guess(mid) == 0:                return mid            elif guess(mid) == -1:                right = mid - 1            elif guess(mid) == 1:                left = mid + 1

也有大神的做法,现在还看不懂,学习学习

def guessNumber(self, n):        class C: __getitem__ = lambda _, i: -guess(i)        return bisect.bisect(C(), -1, 1, n)

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