(Checking Sudoku solution) Listing checks whether a solution is valid by checking whether...

(Checking Sudoku solution) Listing checks whether a solution is valid by checking whether every number is valid in the board. Rewrite the program by checking whether every row, every column and every small box has numbers 1 to 9

CheckSudokuSolution.cpp

#include using namespace std;void readASolution(int grid[][9 ]);bool isValid(const int grid[][9]);bool isValid(int i, int j, const int grid[][9]);int main(){   // Read a Sudoku puzzle   int grid[9 ][9 ];   readASolution(grid);   cout << (isValid(grid) ? "Valid solution" : "Invalid solution");

   return 0;}// Read a Sudoku puzzle from the keyboardvoid readASolution(int grid[][9 ]){   cout << “Enter a Sudoku puzzle:” << endl;   for (int i = 0; i < 9; i++)    for (int j = 0; j < 9; j++)      cin >> grid[i][j];}// Check whether the fixed cells are valid in the gridbool isValid(const int grid[][9 ]){   for (int i =0 ; i < 9 ; i++)     for (int j = 0 ; j < 9 ; j++)   if (grid[i][j] < 1 || grid[i][j] > 9 ||      !isValid(i, j, grid))         return false ;return true ; // The fixed cells are valid}// Check whether grid[i][j] is valid in the gridbool isValid(int i, int j, const int grid[][9 ]){   // Check whether grid[i][j] is valid at the i’s row     for (int column = 0; column < 9; column++)      if (column != j && grid[i][column] == grid[i][j])        return false ;   // Check whether grid[i][j] is valid at the j's column     for (int row = 0; row < 9; row++)      if (row != i && grid[row][j] == grid[i][j])          return false ;   // Check whether grid[i][j] is valid in the 3-by-3 box     for (int row = (i / 3) * 3; row < (i / 3) * 3 + 3; row++)         for (int col = (j / 3) * 3; col < (j / 3) * 3 + 3; col++)          if (row != i 1 to 9

CheckSudokuSolution.cpp

#include using namespace std;void readASolution(int grid[][9 ]);bool isValid(const int grid[][9]);bool isValid(int i, int j, const int grid[][9]);int main(){   // Read a Sudoku puzzle   int grid[9 ][9 ];   readASolution(grid);   cout << (isValid(grid) ? "Valid solution" : "Invalid solution");

col != j && grid[row][col] == grid[i][j])            return false ;return true ; // The current value at grid[i][j] is valid}