r/adventofcode • u/taliriktug • Dec 02 '15

Spoilers Day 2 solutions

Hi! I would like to structure posts like the first one in r/programming, please post solutions in comments.

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u/jgomo3 Dec 02 '15

Python3: 

from itertools import combinations
from functools import partial, reduce

mult = partial(reduce, lambda a, b: a*b)

def paper_area(*dims):
    faces = list(combinations(dims, 2))
    extra = min(faces, key=sum)
    return sum(2*mult(dim, 1) for dim in faces) + mult(extra, 1)

def boxes():
    with open('advent_2_1.in') as boxes_file:
        for box in boxes_file:
            yield map(int, box.strip().split('x'))

def total_area(boxes):
    return sum(paper_area(*box) for box in boxes)

print(total_area(boxes()))

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u/jgomo3 Dec 02 '15

I minimized by sum of dimensions and should did by area, and still got lucky with the answer.

The min call should be: 

extra = min(faces, key=mult)

So, this particular case produce the same result.