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Link for the Problem – Remove Nth Node From End of List– LeetCode Problem
Remove Nth Node From End of List– LeetCode Problem
Problem:
Given the head
of a linked list, remove the nth
node from the end of the list and return its head.
Example 1:
![Remove Nth Node From End of List LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct] 2](https://assets.leetcode.com/uploads/2020/10/03/remove_ex1.jpg)
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
Remove Nth Node From End of List– LeetCode Solutions
class Solution { public: ListNode* removeNthFromEnd(ListNode* head, int n) { auto slow = head; auto fast = head; while (n--) fast = fast->next; if (!fast) return head->next; while (fast->next) { slow = slow->next; fast = fast->next; } slow->next = slow->next->next; return head; } };
class Solution { public ListNode removeNthFromEnd(ListNode head, int n) { ListNode slow = head; ListNode fast = head; while (n-- > 0) fast = fast.next; if (fast == null) return head.next; while (fast.next != null) { slow = slow.next; fast = fast.next; } slow.next = slow.next.next; return head; } }
class Solution: def removeNthFromEnd(self, head: ListNode, n: int) -> ListNode: slow = head fast = head for _ in range(n): fast = fast.next if not fast: return head.next while fast.next: slow = slow.next fast = fast.next slow.next = slow.next.next return head
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