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import java.util.HashSet;

import java.util.Set;

public class TwoSumIVInputIsABST {

Set<Integer> elements = new HashSet<>();

public boolean findTarget(TreeNode root, int k) {

if (root == null) return false;

if (elements.contains(k - root.val)) return true;

elements.add(root.val);

return findTarget(root.left, k) || findTarget(root.right, k);

}

}