Removed duplicate CPP solution for problem 100.same-tree and added Py…

…thon solution

problems/100.same-tree.md

@@ -61,7 +61,7 @@ https://leetcode-cn.com/problems/same-tree/
 
 ### 代码
 
-- 语言支持：CPP, JS, Go, PHP, CPP
+- 语言支持：CPP, JS, Go, PHP, Python
 
 CPP Code:
 
@@ -123,15 +123,18 @@ class Solution
 }
 ```
 
-CPP Code:
-
-```cpp
-class Solution {
-public:
-    bool isSameTree(TreeNode* p, TreeNode* q) {
-        return (!p && !q) || (p && q && p->val == q->val && isSameTree(p->left, q->left) && isSameTree(p->right, q->right));
-    }
-};
+Python Code:
+
+```Python
+class Solution:
+    def isSameTree(self, p: TreeNode, q: TreeNode) -> bool:
+        if not p and not q:
+            return True
+        if not p or not q:
+            return False
+        if p.val != q.val:
+            return False
+        return self.isSameTree(p.left, q.left) and self.isSameTree(p.right, q.right)
 ```
 
 **复杂度分析**