1 files changed, 37 insertions, 0 deletions
diff --git a/606/main.py b/606/main.py
new file mode 100755
index 0000000..44a82c7
--- /dev/null
+++ b/606/main.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+
+import typing
+
+
+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: typing.Optional[TreeNode]) -> str:
+        if not root:
+            return ""
+        if not root.left and not root.right:
+            return str(root.val)
+        if not root.right:
+            return str(root.val) + "(" + self.tree2str(root.left) + ")"
+        return (
+            str(root.val)
+            + "("
+            + self.tree2str(root.left)
+            + ")("
+            + self.tree2str(root.right)
+            + ")"
+        )
+
+
+def main():
+    solution = Solution()
+    print(solution.tree2str())
+
+
+if __name__ == "__main__":
+    main()