There is a single direction linked list. Please give the 50th element from the end of the given list.
This problem asks for the 50th node from the end of a singly linked list. The standard solution is a two-pointer approach: move one pointer 50 steps ahead, then advance both pointers together until the fast pointer reaches the end. The slow pointer will then point to the desired node. This runs in one pass with O(n) time and O(1) extra space, and should also handle lists shorter than 50 nodes according to the problem requirements.
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