力扣1984. 学生分数的最小差值

class Solution(object):
    def minimumDifference(self, A, k):
        """
        :type nums: List[int]
        :type k: int
        :rtype: int
        """
        n = len(A)
        if n <= 1: return 0
        A.sort()
        # print A
        ans = 10**5
        for i in range(n-k+1):
            # print i, A[i]
            ans = min(ans, A[i+k-1]-A[i])
        for j in range(n-1, k-1, -1):
            # print j, A[j]
            ans = min(ans, A[j]-A[j-k+1])
        return ans

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```