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 will tell you whether the number I picked is higher or lower than your guess. You call a pre-defined API int guess(int num), which returns 3 possible results: -1: The number I picked is lower than your guess (i.e. pick < num). 1: The number I picked is higher than your guess (i.e. pick > num). 0: The number I picked is equal to your guess (i.e. pick == num). Return the number that I picked. Example 1: Input: n = 10, pick = 6 Output: 6 Example 2: Input: n = 1, pick = 1 Output: 1 Example 3: Input: n = 2, pick = 1 Output: 1 Example 4: Input: n = 2, pick = 2 Output: 2 Constraints: 1 <= n <= 231 - 1 1 <= pick <= n