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 low = 1;
int high = n;
while (low <= high) {
int mid = low + (high - low) / 2;
int compare = guess(mid);
if (compare == 0) {
return mid;
}
if (compare== 1) {
low = mid + 1;
}
if (compare == -1) {
high = mid - 1;
}
}
return n;
}
}

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