Java | Leetcode Java题解之第101题对称二叉树

题目：

题解：

class Solution {public boolean isSymmetric(TreeNode root) {return check(root, root);}public boolean check(TreeNode u, TreeNode v) {Queue<TreeNode> q = new LinkedList<TreeNode>();q.offer(u);q.offer(v);while (!q.isEmpty()) {u = q.poll();v = q.poll();if (u == null && v == null) {continue;}if ((u == null || v == null) || (u.val != v.val)) {return false;}q.offer(u.left);q.offer(v.right);q.offer(u.right);q.offer(v.left);}return true;}
}