Given k sorted linked lists each of size n, merge them and print the sorted output.
Input: k = 3, n = 4 list1 = 1->3->5->7->NULL list2 = 2->4->6->8->NULL list3 = 0->9->10->11 Output: 0->1->2->3->4->5->6->7->8->9->10->11
Approach: An efficient solution for the problem has been dicussed in Method 3 of this post. Here another solution has been provided which the uses the MIN HEAP data structure. This solution is based on the min heap approach used to solve the problem ‘merge k sorted arrays’ which is discussed here.
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Time Complexity: O(nk Logk)
Auxiliary Space: O(k)
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Improved By : _Gaurav_Tiwari