You have k lists of sorted integers in non-decreasing order. Find the smallest range that includes at least one number from each of the k lists. We define the range [a, b] is smaller than range [c, d] if b - a < d - c or a < c if b - a == d - c. Example 1: Input: nums = [[4,10,15,24,26],[0,9,12,20],[5,18,22,30]] Output: [20,24] Explanation: List 1: [4, 10, 15, 24,26], 24 is in range [20,24]. List 2: [0, 9, 12, 20], 20 is in range [20,24]. List 3: [5, 18, 22, 30], 22 is in range [20,24]. Example 2: Input: nums = [[1,2,3],[1,2,3],[1,2,3]] Output: [1,1] Example 3: Input: nums = [[10,10],[11,11]] Output: [10,11] Example 4: Input: nums = [[10],[11]] Output: [10,11] Example 5: Input: nums = [[1],[2],[3],[4],[5],[6],[7]] Output: [1,7] Constraints: nums.length == k 1 <= k <= 3500 1 <= nums[i].length <= 50 -105 <= nums[i][j] <= 105 nums[i] is sorted in non-decreasing order.