Give an O (n lg k)-time algorithm to merge k sorted lists into one sorted list

The solution for “Give an O (n lg k)-time algorithm to merge k sorted lists into one sorted list” can be found here. The following code will assist you in solving the problem.

Analysis: It takes O(k) to build the heap; for every element, it takes O(lg k) to DeleteMin
and O(lg k) to insert the next one from the same list. In total it takes O(k + n lg k) =
O(n lg k).

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