Update 0203.移除链表元素.md（补充Python直接在原链表操作的代码）

problems/0203.移除链表元素.md

@@ -369,9 +369,33 @@ class Solution {
 ```
 
 ### Python：
-
+直接使用原链表
+```python
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution:
+    def removeElements(self, head: Optional[ListNode], val: int) -> Optional[ListNode]:
+        while head != None and head.val == val:
+            head = head.next
+        if head == None:
+            return None
+
+        cur = head.next
+        pre = head
+        while cur != None:
+            if cur.val == val:
+                pre.next = cur.next
+            else:
+                pre = pre.next
+            cur = cur.next
+
+        return head
+```
+虚拟头节点法
 ```python
-（版本一）虚拟头节点法
 # Definition for singly-linked list.
 # class ListNode:
 #     def __init__(self, val=0, next=None):