Update Solution 019 [Python3]

Author: chakyam

solution/019.Remove Nth Node From End of List/Solution.py

@@ -0,0 +1,25 @@
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, x):
+#         self.val = x
+#         self.next = None
+
+class Solution:
+    def removeNthFromEnd(self, head, n):
+        """
+        :type head: ListNode
+        :type n: int
+        :rtype: ListNode
+        """
+        pre=ListNode(-1)
+        pre.next=head
+        fast=pre
+        slow=pre
+        
+        for _ in range(n):
+            fast=fast.next
+        while fast.next:
+            fast=fast.next
+            slow=slow.next
+        slow.next=slow.next.next
+        return pre.next