a minute read (About 189 words)

BFS二叉树3

题目

https://leetcode-cn.com/problems/cong-shang-dao-xia-da-yin-er-cha-shu-iii-lcof

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a few seconds read (About 78 words)

BFS二叉树2

题目

https://leetcode-cn.com/problems/binary-tree-level-order-traversal/

解法

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public List<List<Integer>> levelOrder(TreeNode root) {
    Queue<TreeNode> queue = new LinkedList<>();
    List<List<Integer>> res = new ArrayList<>();
    if (root != null) queue.add(root);
    while (!queue.isEmpty()) {
        List<Integer> tmp = new ArrayList<>();
        for (int i=queue.size(); i>0; i--) {
            TreeNode node = queue.poll();
            tmp.add(node.val);
            if (node.left != null) queue.add(node.left);
            if (node.right != null) queue.add(node.right);
        }
        res.add(tmp);
    }
    return res;
}
a few seconds read (About 89 words)

BFS二叉树

题目

https://leetcode-cn.com/problems/cong-shang-dao-xia-da-yin-er-cha-shu-lcof

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a few seconds read (About 53 words)

栈的压入弹出序列

题目

https://leetcode-cn.com/problems/zhan-de-ya-ru-dan-chu-xu-lie-lcof

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a minute read (About 127 words)

顺时针打印矩阵

题目

https://leetcode-cn.com/problems/shun-shi-zhen-da-yin-ju-zhen-lcof

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a few seconds read (About 67 words)

对称的二叉树

题目

https://leetcode-cn.com/problems/dui-cheng-de-er-cha-shu-lcof

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a few seconds read (About 62 words)

二叉树的镜像

题目

https://leetcode-cn.com/problems/er-cha-shu-de-jing-xiang-lcof/

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a few seconds read (About 107 words)

树的子结构

题目

https://leetcode-cn.com/problems/shu-de-zi-jie-gou-lcof/

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a few seconds read (About 71 words)

包含min的栈

题目

https://leetcode-cn.com/problems/bao-han-minhan-shu-de-zhan-lcof

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4 minutes read (About 532 words)

删除链表的倒数第N个节点

题目

https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list

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