[JAVA] 3 lines elegant solution


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    public boolean isSameTree(TreeNode p, TreeNode q) {
            if(p== null || q== null){
                return p == null && q == null;
            }
            return p.val == q.val && isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
        }
    

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