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Problem 19: Remove Nth Node From End of List

Difficulty: Medium

Problem

Given a linked list, remove the nth node from the end of list and return its head.

Note:

Given n will always be valid. Try to do this in one pass.

Example

   Given linked list: 1->2->3->4->5, and n = 2.

   After removing the second node from the end, the linked list becomes 1->2->3->5.