chandansgowda
diff --git a/‎501-1000/606.py
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+21Lines changed: 21 additions & 0 deletions b/‎501-1000/606.py
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+21Lines changed: 21 additions & 0 deletions
@@ -0,0 +1,21 @@
+# Definition for a binary tree node.
+# class TreeNode:
+#     def __init__(self, val=0, left=None, right=None):
+#         self.val = val
+#         self.left = left
+#         self.right = right
+class Solution:
+    def tree2str(self, root: Optional[TreeNode]) -> str:
+        if root is None:
+            return ''
+        s = str(root.val)
+        if root.left is None and root.right is None:
+            s += ''
+        if root.left:
+            s += '({})'.format(self.tree2str(root.left))
+        if root.left is None and root.right:
+            s += '()'
+        if root.right:
+            s+= '({})'.format(self.tree2str(root.right))
+        return s
+