# Leetcode 374 - Guess number higher or lower

Note:

• Double pointers
• Because there is no duplicates, we can let low < high.
• >>> has a higher predecender than -. So we need a parentheses const middle = low + ((high - low) >>> 1).

Question:

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:

Code: