tree.json

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                  {
                    "复原 IP 地址": {
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                    "逆波兰表达式求值": {
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                  {
                    "下一个排列": {
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                    "旋转链表": {
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                  {
                    "颜色分类": {
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                    "缺失的第一个正数": {
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                    "整数转罗马数字": {
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                    "Pow(x, n)": {
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                  {
                    "排列序列": {
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                  {
                    "加一": {
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                  {
                    "二进制求和": {
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                  },
                  {
                    "x 的平方根": {
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                    "LRU 缓存机制": {
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                  {
                    "设计推特": {
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                  {
                    "O(1) 时间插入、删除和获取随机元素": {
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                  {
                    "O(1) 时间插入、删除和获取随机元素 - 允许重复": {
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                  {
                    "LFU 缓存": {
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            {
              "leetcode-动态规划": {
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                    "正则表达式匹配": {
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                    "括号生成": {
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                  {
                    "通配符匹配": {
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                    "最大子序和": {
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                  {
                    "不同路径": {
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          ]
        }
      }
    ]
  }
}