1984-minimum-difference-between-highest-and-lowest-of-k-scores.java

class Solution {
    public int minimumDifference(int[] nums, int k) {
        if(k == 1) return 0;

        Arrays.sort(nums);

        int min = Integer.MAX_VALUE;
        for(int i=0; i<nums.length-k+1; i++) {
            int diff = Math.abs(nums[i] - nums[i+k-1]);
            min = Math.min(diff, min);
        }

        return min;
    }
}