Fucking backtracking

soup /prog/, i need halp!
i'm trying to make this fucking backtracking (lol) problem: http://acm.uva.es/p/v8/861.html ; but i dont even know where to start! Any tips on how to analyse this problem?

i need your wisdom /prog/ :D

Read SICP, the part on backtracking algorithms (chapter the second).

For a moment I thought this was a gdb topic ;_;

>>3
It can be if you want it to.

>>4
This is the feature I like the most in /prog/.

>>1
Why don't you write it in Qi and make use of the built-in chronological backtracking feature?

^{Back to /b/, ``GNAA Faggot''}

All work and no play makes Jack a dull boy
 All work and no play makes Jack a dull boy
 All work and no play makes Jack a dull boy
 All work and no play makes Jack a dull boy
 All work and no play makes Jack a dull boy
 All work and no play makes Jack a dull boy
 All work and no play makes Jack a dull boy
 All work and no play makes Jack a dull boy
 All work and no play makes Jack a dull boy