1200. 最小绝对差

class Solution:
    def minimumAbsDifference(self, arr: List[int]) -> List[List[int]]:
        if len(arr) < 2:
            return []

        arr = sorted(arr)
        min_diff = min(a - b for a, b in zip(arr[1:], arr[:-1]))
        return [[b, a] for a, b in zip(arr[1:], arr[:-1]) if a - b == min_diff]