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));    }};`
The text passage contains a description of a problem related to constructing a quadtree from a grid, along with a C++ code implementation. There is no explicit mathematical question or answer provided in the text.
no_question
Given a text passage, determine:
    1. If it contains a mathematical question (including word problems or calculations)
    2. If an answer to that mathematical question is provided in the text

First, describe the content structure you found in 1-2 sentences.

Then provide your analysis in the following format:
TYPE: <one of the following values>
- NO_QUESTION
- SINGLE_QUESTION
- SINGLE_QUESTION_WITH_ANSWER
- MULTIPLE_QUESTIONS
- MULTIPLE_QUESTIONS_WITH_ANSWERS
system
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));    }};`
user
The text passage contains a description of a problem related to constructing a quadtree from a grid, along with a C++ code implementation. There is no explicit mathematical question or answer provided in the text.

TYPE: NO_QUESTION