1 files changed, 35 insertions, 0 deletions
diff --git a/938/main.py b/938/main.py
new file mode 100755
index 0000000..0728b21
--- /dev/null
+++ b/938/main.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+
+
+class TreeNode:
+    def __init__(self, val=0, left=None, right=None):
+        self.val = val
+        self.left = left
+        self.right = right
+
+
+class Solution:
+    import typing
+
+    def rangeSumBST(self, root: typing.Optional[TreeNode], low: int, high: int) -> int:
+        if root is None:
+            return 0
+
+        if root.val < low or root.val > high:
+            return self.rangeSumBST(root.left, low, high) + self.rangeSumBST(
+                root.right, low, high
+            )
+        return (
+            root.val
+            + self.rangeSumBST(root.left, low, high)
+            + self.rangeSumBST(root.right, low, high)
+        )
+
+
+def main() -> None:
+    solution = Solution()
+    print(solution.rangeSumBST())
+
+
+if __name__ == "__main__":
+    main()