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Brian Buller
2018-03-15 11:24:23 -05:00
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Advent of Code
br0xen 40*
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Advent of Code
--- Day 2: I Was Told There Would Be No Math ---
The elves are running low on wrapping paper, and so they need to submit an order for more. They
have a list of the dimensions (length l, width w, and height h) of each present, and only want
to order exactly as much as they need.
The elves are running low on wrapping paper, and so they need to submit an
order for more. They have a list of the dimensions (length l, width w, and
height h) of each present, and only want to order exactly as much as they
need.
Fortunately, every present is a box (a perfect right rectangular prism), which makes
calculating the required wrapping paper for each gift a little easier: find the surface area of
the box, which is 2*l*w + 2*w*h + 2*h*l. The elves also need a little extra paper for each
present: the area of the smallest side.
Fortunately, every present is a box (a perfect right rectangular prism),
which makes calculating the required wrapping paper for each gift a little
easier: find the surface area of the box, which is 2*l*w + 2*w*h + 2*h*l.
The elves also need a little extra paper for each present: the area of the
smallest side.
For example:
• A present with dimensions 2x3x4 requires 2*6 + 2*12 + 2*8 = 52 square feet of wrapping
paper plus 6 square feet of slack, for a total of 58 square feet.
• A present with dimensions 1x1x10 requires 2*1 + 2*10 + 2*10 = 42 square feet of wrapping
paper plus 1 square foot of slack, for a total of 43 square feet.
• A present with dimensions 2x3x4 requires 2*6 + 2*12 + 2*8 = 52 square
feet of wrapping paper plus 6 square feet of slack, for a total of 58
square feet.
All numbers in the elves' list are in feet. How many total square feet of wrapping paper should
they order?
• A present with dimensions 1x1x10 requires 2*1 + 2*10 + 2*10 = 42 square
feet of wrapping paper plus 1 square foot of slack, for a total of 43
square feet.
All numbers in the elves' list are in feet. How many total square feet of
wrapping paper should they order?
Your puzzle answer was 1588178.
--- Part Two ---
The elves are also running low on ribbon. Ribbon is all the same width, so they only have to
worry about the length they need to order, which they would again like to be exact.
The elves are also running low on ribbon. Ribbon is all the same width, so
they only have to worry about the length they need to order, which they
would again like to be exact.
The ribbon required to wrap a present is the shortest distance around its sides, or the
smallest perimeter of any one face. Each present also requires a bow made out of ribbon as
well; the feet of ribbon required for the perfect bow is equal to the cubic feet of volume of
the present. Don't ask how they tie the bow, though; they'll never tell.
The ribbon required to wrap a present is the shortest distance around its
sides, or the smallest perimeter of any one face. Each present also requires
a bow made out of ribbon as well; the feet of ribbon required for the
perfect bow is equal to the cubic feet of volume of the present. Don't ask
how they tie the bow, though; they'll never tell.
For example:
• A present with dimensions 2x3x4 requires 2+2+3+3 = 10 feet of ribbon to wrap the present
plus 2*3*4 = 24 feet of ribbon for the bow, for a total of 34 feet.
• A present with dimensions 1x1x10 requires 1+1+1+1 = 4 feet of ribbon to wrap the present
plus 1*1*10 = 10 feet of ribbon for the bow, for a total of 14 feet.
• A present with dimensions 2x3x4 requires 2+2+3+3 = 10 feet of ribbon to
wrap the present plus 2*3*4 = 24 feet of ribbon for the bow, for a total
of 34 feet.
• A present with dimensions 1x1x10 requires 1+1+1+1 = 4 feet of ribbon to
wrap the present plus 1*1*10 = 10 feet of ribbon for the bow, for a total
of 14 feet.
How many total feet of ribbon should they order?
@@ -54,12 +56,11 @@
Both parts of this puzzle are complete! They provide two gold stars: **
At this point, you should return to your advent calendar and try another puzzle.
At this point, you should return to your advent calendar and try another
puzzle.
If you still want to see it, you can get your puzzle input.
You can also [Shareon Twitter Google+ Reddit] this puzzle.
References
Visible links
@@ -72,6 +73,3 @@ References
. https://en.wikipedia.org/wiki/Cuboid#Rectangular_cuboid
. http://adventofcode.com/
. http://adventofcode.com/day/2/input
. https://twitter.com/intent/tweet?text=I%27ve+completed+%22I+Was+Told+There+Would+Be+No+Math%22+%2D+Day+2+%2D+Advent+of+Code&url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F2&related=ericwastl&hashtags=AdventOfCode
. https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F2
. http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F2&title=I%27ve+completed+%22I+Was+Told+There+Would+Be+No+Math%22+%2D+Day+2+%2D+Advent+of+Code