{
  "type": "code_options",
  "source": "solution.md",
  "exercise_id": "d114c28fb45e4d2896876a26b18d731c",
  "author": "csdn.net",
  "keywords": "栈,树,深度优先搜索,二叉搜索树,双指针,二叉树,堆（优先队列）"
}