public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {
if(root==null){
return null;
}
if(p.val<root.val && q.val<root.val){
return lowestCommonAncestor(root.left,p,q);
}
if(p.val>root.val && q.val>root.val){
return lowestCommonAncestor(root.right,p,q);
}
return root;
}
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