Sudoku code
Puzzle description
A sudoku is a N × N {\displaystyle N\times N} number-placement puzzle. It is filled in a way, that in each column, row and sub-grid N distinct symbols occur exactly once. Typical alphabet is the set of the integers { 1 , … , N } {\displaystyle \{1,\ldots ,N\}} . The size of the sub-grids limit the size of SUDOKUs to N = n 2 {\displaystyle N=n^{2}} with n ∈ N {\displaystyle n\in \mathrm {N} } . Every solved sudoku and every sub-grid of it is a Latin square, meaning every symbol occurs exactly once in each row and column. At the starting point (in this case after the erasure channel) the puzzle is only partially complete but has only one unique solution.
Sudoku code-6