21. Merge Two Sorted Lists

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21. Merge Two Sorted Lists

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Merge two sorted linked lists and return it as a new sorted list. The new list should be made by splicing together the nodes of the first two lists.

Example:

Input: 1->2->4, 1->3->4
Output: 1->1->2->3->4->4

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• no way to insert to two sorted array, too complex