The problem was to write a program which automatically solves Boulder Dash efficiently (the less turn you consume, the better).
As usual, I joined the lightning division (the first 24 hours of this 72 hours long contest) with C++. However, I decided to do something different this year because I was getting a bit bored of this kind of topcoder marathon match style problems. So, I wrote the boulder dash solver in Befunge:
I guess this is one of the biggest hand-written Befunge code. Technically, this isn't Befunge-93 code because it uses address space bigger than 80x25, so this code requires Funge-98 implementation like cfunge. However, I think it would be OK to claim this is a Befunge code because I only used Befunge-93 operations. Anyway, it wasn't easy to write this code, although I think I'm fairly good at Befunge (I've ever won a Befunge contest at codeforces). Like other participants, I didn't do almost nothing except for writing this code, but it was just 6 hours before the end of contest when I finished my simulator in Befunge...
The following is the full package I submitted. This includes a Befunge interpreter implementation written by me during this contest, some Makefile and README stuff, code for lightning division, etc.
This is an attempt to describe something about my code. You can see a visualized image of dungeon around the bottom right of this image. This is just a memory dump. Befunge has 2D address space so we need no external visualizer.
BTW, I forgot to write something about ICFP programming contest 2011. It was great. The problem was better than all other contest problems I've ever seen and the organizers prepared a fairly stable duel server where participants can fight each other. I took 6th place. It seemed the 5th place team was also 1 person team and he got the judge's prize because of he was a one person team. So, I was the 2nd place one person team, yay.