标签：def follow span define ble blog public leetcode ssi
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.
典型的二分查找问题。
// 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) { int lo = 1, hi = n; while (lo <= hi) { int mid = lo + (hi - lo) / 2; int res = guess(mid); if (res == 0) return mid; else if (res == -1) hi = mid - 1; else if (res == 1) lo = mid + 1; } return 0; } }; // 0 ms
[LeetCode] Guess Number Higher or Lower
标签：def follow span define ble blog public leetcode ssi
原文地址：http://www.cnblogs.com/immjc/p/7619913.html
