Easy understand 3 line Java Solution


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

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