# 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:`

1 | Input: n = 10, pick = 6 |

`Code:`

1 | /** |