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# Definition for a binary tree node.

# class TreeNode(object):

# def __init__(self, x):

# self.val = x

# self.left = None

# self.right = None

class Solution(object):

def trimBST(self, root, L, R):

"""

:type root: TreeNode

:type L: int

:type R: int

:rtype: TreeNode

"""

if root == None:

return None;

if root.val < L:

root = root.right;

return self.trimBST(root, L, R);

elif root.val > R:

root = root.left;

return self.trimBST(root, L, R);

else:

root.left = self.trimBST(root.left, L, R);

root.right = self.trimBST(root.right, L, R);

return root;