Middle of a Linked List
Find the middle node of a linked list.
Input: 0 1 2 3 4
Output: 2
If the number of nodes is even, then return the second middle node.
Input: 0 1 2 3 4 5
Output: 3
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1 >>> a = [1, 2, 3] 2 >>> a[-1] 3 3
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