#include <iostream>

#include <vector>

using  namespace std;

bool isvalid(int i,int j,int ans,vector<vector<char>>& board)

{

    for (int k = ; k < ; k++) //判断同行同列是否有重复

    {

        if (board[k][j] == ans) return false;

        if (board[i][k] == ans) return false;

    }

    //算出所在的宫格块左上角位置

    i=i/*;

    j=j/*;

    //判断宫格内是重复

    for(int k=i;k<i+;k++)

        for(int h=j;h<j+;h++)

        {

            if (board[k][h] == ans) return false;

        }

    return true;

}

bool try_ans(vector<vector<char>>& board)

{

    for (int i = ; i < ; i++)

    {

        for (int j = ; j < ; j++)

        {

            if (board[i][j]!='.') continue;

            for (char ans = ''; ans <= ''; ans++)

            {

                if (!isvalid(i,j,ans,board)) continue;//是否可以放入

                board[i][j] = ans;

                if (try_ans(board)) return true;//是否放完了

                else board[i][j] = '.';

            }

            return false;

        }

    }

    return true;//最后每个地方都放入了数字，返回真

}

void solveSudoku(vector<vector<char>>& board)

{

    try_ans(board);

}

int main() {

    std::cout << "Hello, World!" << std::endl;

    return ;

}