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 three possible results:

`-1`

: Your guess is higher than the number I picked (i.e.`num > pick`

).`1`

: Your guess is lower than the number I picked (i.e.`num < pick`

).`0`

: your guess is equal to the number I picked (i.e.`num == pick`

).

Return *the number that I picked*.

**Example 1:**

Input:n = 10, pick = 6Output:6

**Example 2:**

Input:n = 1, pick = 1Output:1

**Example 3:**

Input:n = 2, pick = 1Output:1

**Constraints:**

`1 <= n <= 2`

^{31}- 1`1 <= pick <= n`

` ````
```class Solution {
public:
int guessNumber(int n) {
long int mid=n/2;
long int start=1;
long int end=n;
while(start

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