163.缺失的区间

class Solution {public List<List<Integer>> findMissingRanges(int[] nums, int lower, int upper) {List<List<Integer>> res = new ArrayList<>();for(int num : nums){if(lower < num){res.add(Arrays.asList(lower,num - 1));}lower = num + 1;   }if(lower <= upper){res.add( Arrays.asList(lower,upper));}return res;}
}