* 判断是否为对称二叉树 * 对称二叉树条件为： * - 两个根节点相等 * - 左子树的右节点和右子树的左节点相同 * - 右子树的左节点和左子树的右节点相同 * * @param {TreeNode} node1 * @param {TreeNode} node2
(node1, node2)
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