Debug-Codes/Sudoku Solver at main · prakharsharma27/Debug-Codes · GitHub

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 void solveSudoku(vector<vector<char>>& board)
    {
      solve(board);
    }


    bool solve(vector<vector<char>>& board)
    {
        for(int i=0;i<9;i++)
        {
            for(int j=0;j<9;j++)
            {
                if(board[i][j]=='.')
                {
                    for(char c='1';c<='9';c++)
                    {
                        if(isValid(i,j,c,board))
                        {
                          board[i][j]=c;

                          if(solve(board)==true)
                          return true;
                          else
                          board[i][j]='.';
                        }

                    }
                    return false;
                }

            }
        }
       return true;
    }


   bool isValid(int row,int col,char c,vector<vector<char>>& board)
   {
       for(int i=0;i<9;i++)
       {
           if(board[i][col]==c)
           return false;

           if(board[row][i]==c)
           return false;

           if(board[3*(row/3)+(i/3)][3*(col/3)+(i%3)]==c)
           return false;

       }
      return true;
   }