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public TreeNode insertIntoBST(TreeNode root, int val) {
    TreeNode tNode = new TreeNode(val);
    TreeNode current = root;
    while(true){
        if(val > current.val){
            //BIGGER
            if(current.right == null){//insert
                current.right = tNode;
                break;
            }
            current = current.right;
        }else{
            //SMALLER
            if(current.left == null){//insert
                current.left = tNode;
                break;
            }
            current = current.left;
        }
    }
    return root;
}