1497. Check If Array Pairs Are Divisible by k
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Given an array of integers `arr` of even length `n` and an integer `k`.

We want to divide the array into exactly `n / 2` pairs such that the sum of each pair is divisible by `k`.

Return `true` If you can find a way to do that or `false` otherwise.

Example 1:

```Input: arr = [1,2,3,4,5,10,6,7,8,9], k = 5
Output: true
Explanation: Pairs are (1,9),(2,8),(3,7),(4,6) and (5,10).
```

Example 2:

```Input: arr = [1,2,3,4,5,6], k = 7
Output: true
Explanation: Pairs are (1,6),(2,5) and(3,4).
```

Example 3:

```Input: arr = [1,2,3,4,5,6], k = 10
Output: false
Explanation: You can try all possible pairs to see that there is no way to divide arr into 3 pairs each with sum divisible by 10.
```

Constraints:

• `arr.length == n`
• `1 <= n <= 105`
• `n` is even.
• `-109 <= arr[i] <= 109`
• `1 <= k <= 105`
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