Week 12

Author: 8804who

remove-nth-node-from-end-of-list/8804who.py

@@ -0,0 +1,32 @@
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution:
+    def removeNthFromEnd(self, head: Optional[ListNode], n: int) -> Optional[ListNode]:
+        if not head:
+            return None
+
+        temp = head
+        length = 0
+
+        while temp:
+            length += 1
+            temp = temp.next
+        
+        return self.removeNth(head, length-n+1)
+
+    def removeNth(self, head, n):
+        if n == 1:
+            if not head.next:
+                return None
+            else:
+                return head.next
+        else:
+            if not head.next:
+                return head
+            head.next = self.removeNth(head.next, n-1)
+            return head
+        
+