# 2006. Count Number of Pairs With Absolute Difference K

import sys
from typing import List


class Solution:
    def countKDifference(self, nums: List[int], k: int) -> int:
        return sum(
            len(
                [
                    1
                    for j in range(len(nums))
                    if i < j and abs(nums[i] - nums[j]) == k
                ]
            )
            for i in range(len(nums))
        )
    pass


def main() -> int:
    def r(ns: List[int], k: int) -> None:
        print(
            f"Solution().countKDifference({ns}, {k}) = {Solution().countKDifference(ns, k)}"
        )
        pass

    r([1, 2, 2, 1], 1)
    r([1, 3], 3)
    r([3, 2, 1, 5, 4], 2)
    return 0


if __name__ == "__main__":
    sys.exit(main())