LeetCode100-相同的树

LeetCode100-相同的树

层序遍历

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public boolean isSameTree(TreeNode p, TreeNode q) {
        if (p == null || q == null) return true;
        Queue<TreeNode> queue1 = new LinkedList<>();
        Queue<TreeNode> queue2 = new LinkedList<>();
        queue1.offer(p);
        queue2.offer(q);
        while (!queue1.isEmpty() && !queue2.isEmpty()) {
            TreeNode poll1 = queue1.poll();
            TreeNode poll2 = queue2.poll();
            if (poll1.val != poll2.val) return false;
            if (poll1.left == null ^ poll2.left == null) {
                return false;
            }
            if (poll1.right == null ^ poll2.right == null) {
                return false;
            }
            if (poll1.left!=null) queue1.offer(poll1.left);
            if (poll2.left!=null) queue2.offer(poll2.left);
            if (poll1.right!=null) queue1.offer(poll1.right);
            if (poll2.right!=null) queue2.offer(poll2.right);

        }
        return true;
    }