Example 1:
Input: arr = [2,2,1,1,3], k = 3
Output: 4
Explanation:
Example 2:
Input: arr = [1,2,2,3,1], k = 3
Output: 3
Explanation:
Example 3:
Input: arr = [1,1,1], k = 2
Output: -1
Explanation:
You are given an array of positive integers arr and an integer k.
A subarray is considered good if it contains at least k distinct integers.
Return the minimum possible length of a good subarray. If no such subarray exists, return -1.
The good subarrays are [2,2,1,1,3] and [2,1,1,3]. The minimum length is 4.
The subarray [2,3,1] contains 3 distinct integers, so the answer is 3.
There are not enough distinct values in the entire array.
1 <= arr.length <= 10^51 <= arr[i] <= 10^61 <= k <= arr.length