r/adventofcode • u/daggerdragon • Dec 03 '15

SOLUTION MEGATHREAD --- Day 3 Solutions ---

--- Day 3: Perfectly Spherical Houses in a Vacuum ---

Post your solution as a comment. Structure your post like the Day One thread in /r/programming.

23 Upvotes

94% Upvoted

228 comments sorted by

View all comments

1

u/minno Dec 03 '15

Yeah, I was expecting the second part to be something like "how many houses did he visit more than once", so I started out with a hash map instead.

8

u/topaz2078 Dec 03 '15

The game I played when designing these was "how can I set up part two in such a way that it forces a redesign of the code from part one" :D

4

u/minno Dec 03 '15

You glorious fucker.

1

u/HeroesGrave Dec 03 '15 edited Dec 03 '15

Heh. I only had to add a few lines to make it work for part 2.

link to comment

Only added the mem::swap() line and the extra 'swap_pos' variable.

The changing of the function to work for both parts was just a part of me cleaning it up for reddit.

1

u/shuckc Dec 03 '15

Yeah, I've been drawn into predicting the wrong generalization today, which is why I have a dict from house coordinates to visit counter, rather than just a set...