lintcode：Guess Number Game

最新推荐文章于 2020-01-11 17:24:52 发布

原创最新推荐文章于 2020-01-11 17:24:52 发布 · 363 阅读

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本文介绍了一种使用二分查找算法解决猜数字游戏的方法。通过不断缩小搜索范围，该算法能够在较短时间内找到目标数字，提高了查找效率。

超时：

# 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
# you can call Guess.guess(num)

class Solution:
    # @param {int} n an integer
    # @return {int} the number you guess
    def guessNumber(self, n):
        # Write your code here
        while Guess.guess(n) != 0:
            if Guess.guess(n) == 1:
                n += 1
            if Guess.guess(n) == -1:
                n -= 1
        return n

二分查找 AC

# 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
# you can call Guess.guess(num)

class Solution:
    # @param {int} n an integer
    # @return {int} the number you guess
    def guessNumber(self, n):
        # Write your code here
        st, ed = 1, n
        while st <= ed:
            mid = st + (ed - st)/2
            res = Guess.guess(mid)
            if res == 0:
                return mid
            elif res == 1:
                st = mid + 1
            else:
                ed = mid - 1
        return st