Given K sorted lists of integers of size N each, find the smallest range that includes at least one element from each of the K lists. If more than one such range's are found, find the first such range found.

Example 1:

Input:
N = 5, K = 3
KSortedArray[][] = {{1 3 5 7 9},
                    {0 2 4 6 8},
                    {2 3 5 7 11}}
Output: 1 2
Explanation: K = 3
A:[1 3 5 7 9]
B:[0 2 4 6 8]
C:[2 3 5 7 11]
Smallest range is formed by number 1
present in first list and 2 is present
in both 2nd and 3rd list.

Example 2:

Input:
N = 4, K = 3
KSortedArray[][] = {{1 2 3 4},
                    {5 6 7 8},
                    {9 10 11 12}}
Output: 4 9

Your Task :

Complete the function findSmallestRange() that receives array , array size n and k as parameters and returns the output range (as a pair<int,int> in cpp and array of size 2 in java and python)

Expected Time Complexity : O(n * k *log k)
Expected Auxilliary Space  : O(k)

Constraints:
1 <= K,N <= 500