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Given an integer array, return the k-th smallest **distance** among all the pairs. The distance of a pair (A, B) is defined as the absolute difference between A and B.

**Example 1:**

Input:nums = [1,3,1] k = 1Output: 0Explanation:Here are all the pairs: (1,3) -> 2 (1,1) -> 0 (3,1) -> 2 Then the 1st smallest distance pair is (1,1), and its distance is 0.

**Note:**

`2 <= len(nums) <= 10000`

.`0 <= nums[i] < 1000000`

.`1 <= k <= len(nums) * (len(nums) - 1) / 2`

.

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