0019. Remove Nth Node From End of List
https://leetcode.com/problems/remove-nth-node-from-end-of-list
Description
Given the head
of a linked list, remove the nth
node from the end of the list and return its head.
Example 1:

**Input:** head = [1,2,3,4,5], n = 2
**Output:** [1,2,3,5]
Example 2:
**Input:** head = [1], n = 1
**Output:** []
Example 3:
**Input:** head = [1,2], n = 1
**Output:** [1]
Constraints:
The number of nodes in the list is
sz
.1 <= sz <= 30
0 <= Node.val <= 100
1 <= n <= sz
Follow up: Could you do this in one pass?
ac
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