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.

 

 

/* 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 l=1;        int r=n;        while(l<=r){            int m=l+((r-l)/2);            if(guess(m) == 1){                l=m+1;            }            else if(guess(m) == -1){                r=m-1;            }            else{                return m;            }        }        return -1;    }}