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LeetCode 23: Merge k Sorted Lists - Interview Prep Ep 26
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LeetCode 23. Merge k Sorted Lists
Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.
Solution explained:
1. We can use a min heap (PriorityQueue) to hold all of the k head nodes of all k sorted linked lists, so that each time, we could quickly get the node with the current minimum value that'd be added into the final result;
2. We first go through the given array of linked list heads, enqueue all of the k heads into the min heap, when we'll constantly check the min heap, each time, we poll one out of the min heap, we do two things:
a. we add this node (create a new list node with this value) into the final merged result;
b. check if this head still has any nodes after it, if so, move the pointer towards its next one and enqueue the next one into the min heap
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