// 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 i=,j=n;

    while(i<j){

        int mid=i+(j-i)/;

        if(guess(mid)==){

            return mid;

        }else if(guess(mid)==){

            i=mid+;

        }else{

            j=mid;

        }

    }

    return i;

    }

};