please complete this method in C

Use only pointer arithmetic notation. There should be no [ ] used.

This method checks if a sudoku board is valid or not, given a heap allocated 2d array of integers and the size of the board.

The size can be from 1-9. There should be no duplicate values.

int rowcolcheck(int **board, int size){ //board is a heap allocated 2d array of integers, size is the number of rows and columns

//pointer arithmetic code without brackets [ ]

}