LeetCode 374. Guess Number Higher or Lower
2017-04-04 08:45
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Description
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:
n = 10, I pick 6.
Return 6.
Analysis
二分搜索。要注意使用//Assume [a,b] (b - a) / 2 + a
而不是
(a + b) / 2
以防止溢出。
Code
// Forward declaration of guess API. // @param num, your guess // @return -1 if my number is lower, 1 if my number is higher, otherwise return 0 int guess(int num); class Solution { public: int guessNumber(int n) { return search(1,n); } private: int search(int a, int b){ int m = (b - a) / 2 + a; int g = guess (m); if (g == 0) return m; else if (g == 1) return search (m + 1, b); else if (g == -1) return search (a, m -1); } };
Appendix
Link: https://leetcode.com/problems/guess-number-higher-or-lower/Run Time: 0ms
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