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374. Guess Number Higher or Lower
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.
二分法：最后锁定一个数也就是low=high找到这个数。
/* The guess API is defined in the parent class GuessGame. @param num, your guess @return -1 if my number is lower, 1 if my number is higher, otherwise return 0 int guess(int num); */public class Solution extends GuessGame { public int guessNumber(int n) { int low=0; int high=n; while(low<high) { int mid=low+(high-low)/2; if(guess(mid)==0) { return mid; } else if(guess(mid)==1) { low=mid+1; } else { high=mid-1; } } return low; }}
374. Guess Number Higher or Lower
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