What if the input is not TreeNode, but the value? How to handle the duplicate case?

• I failed to pass the test case

[37,-34,-48,null,-100,-100,48,null,null,null,null,-54,null,-71,-22,null,null,null,8]
Use the following code:

public class Solution {
public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {
return lca(root, p, q);
}

``````private TreeNode lca(TreeNode root, TreeNode p, TreeNode q) {
if(root == null)
return root;
if(root.val == q.val|| root.val == p.val)
return root;
TreeNode lca_left = lca(root.left, p, q);
TreeNode lca_right = lca(root.right, p, q);
if( lca_left != null && lca_right != null) {
return root;
}
return lca_left == null? lca_right : lca_left;
}
``````

}

I realise that the problem lies in if(root.val == q.val|| root.val == p.val). Since there are two -100 this program return the root. But what if the input is not treeNode but int value? How to modified the program to make it right?

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