text: N 将小于 1000 且确保是 2 的整次幂。 如果你想了解更多关于四叉树的知识，你可以参考这个wiki页面。
  
  `/*// Definition for a QuadTree node.class Node {public:    bool val;    bool isLeaf;    Node* topLeft;    Node* topRight;    Node* bottomLeft;    Node* bottomRight;​    Node() {}​    Node(bool _val, bool _isLeaf, Node* _topLeft, Node* _topRight, Node* _bottomLeft, Node* _bottomRight) {        val = _val;        isLeaf = _isLeaf;        topLeft = _topLeft;        topRight = _topRight;        bottomLeft = _bottomLeft;        bottomRight = _bottomRight;    }};*/class Solution {public:    Node* construct(vector<vector<int>>& grid) {        int N=grid.size();        if(N==0) return NULL;        int sum =0;        for(auto r:grid)            for(auto c: r)                sum +=c;       // cout<<sum<<endl;        if( sum== N*N || sum ==0)         {          return  new Node(grid[0][0],true, NULL,NULL,NULL,NULL);          }​        vector<vector<int>> tl(N/2,vector<int>(N/2,0));        vector<vector<int>> tr(N/2,vector<int>(N/2,0));        vector<vector<int>> bl(N/2,vector<int>(N/2,0));        vector<vector<int>> br(N/2,vector<int>(N/2,0));        bool ftl, ftr,fbl, fbr;        for(int i=0;i<N/2;i++)            for(int j=0;j<N/2;j++)            {                tl[i][j]=grid[i][j];                bl[i][j]=grid[i+N/2][j];                tr[i][j]=grid[i][j+N/2];                br[i][j]=grid[i+N/2][j+N/2];            }​       return new Node(false,false,construct(tl),construct(tr),construct(bl),construct(br));    }};`
explanation: The provided text is a code snippet written in C++ that defines a class for a quadtree node and a solution class that constructs a quadtree from a given grid. The text does not contain a math question or an answer to a math question.
distilabel_metadata.content: Evaluate the user given text extract and determine if it contains a math question and optionally and answer to this question.
  
  Output rules:
  
  1. Briefly describe the document and mention if it contains a question or a question and answer.
  2. Finalize the output with: Label: no-question,question,question-and-answer,multiple-question,multiple-question-and-answer
distilabel_metadata.role: system
distilabel_metadata.content: N 将小于 1000 且确保是 2 的整次幂。 如果你想了解更多关于四叉树的知识，你可以参考这个wiki页面。
  
  `/*// Definition for a QuadTree node.class Node {public:    bool val;    bool isLeaf;    Node* topLeft;    Node* topRight;    Node* bottomLeft;    Node* bottomRight;​    Node() {}​    Node(bool _val, bool _isLeaf, Node* _topLeft, Node* _topRight, Node* _bottomLeft, Node* _bottomRight) {        val = _val;        isLeaf = _isLeaf;        topLeft = _topLeft;        topRight = _topRight;        bottomLeft = _bottomLeft;        bottomRight = _bottomRight;    }};*/class Solution {public:    Node* construct(vector<vector<int>>& grid) {        int N=grid.size();        if(N==0) return NULL;        int sum =0;        for(auto r:grid)            for(auto c: r)                sum +=c;       // cout<<sum<<endl;        if( sum== N*N || sum ==0)         {          return  new Node(grid[0][0],true, NULL,NULL,NULL,NULL);          }​        vector<vector<int>> tl(N/2,vector<int>(N/2,0));        vector<vector<int>> tr(N/2,vector<int>(N/2,0));        vector<vector<int>> bl(N/2,vector<int>(N/2,0));        vector<vector<int>> br(N/2,vector<int>(N/2,0));        bool ftl, ftr,fbl, fbr;        for(int i=0;i<N/2;i++)            for(int j=0;j<N/2;j++)            {                tl[i][j]=grid[i][j];                bl[i][j]=grid[i+N/2][j];                tr[i][j]=grid[i][j+N/2];                br[i][j]=grid[i+N/2][j+N/2];            }​       return new Node(false,false,construct(tl),construct(tr),construct(bl),construct(br));    }};`
distilabel_metadata.role: user
distilabel_metadata.raw_output_q_a_detector_0: The provided text is a code snippet written in C++ that defines a class for a quadtree node and a solution class that constructs a quadtree from a given grid. The text does not contain a math question or an answer to a math question.
  
  Label: no-question