CHAPTER 8
Implementing “Pointing Line”
As I explained in Chapter 2, pointing line is similar to box-line in that they both look at the intersection of a line with a box. Therefore, it is not surprising that the implementations of the two strategies are quite similar.
The general function, pointing_line() (see Listing 8-1), executes pointing_line_box() (see Listing 8-2) for each possible box of the Sudoku.
pointing_line()
The function is so simple that I’m going to show it without any further comment.
Listing 8-1. pointing_line.c
/* pointing_line.c * * Copyright (C) 2015 Giulio Zambon - http://zambon.com.au/ * */#include <stdio.h>#include <stdlib.h> ...
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