adventofcode/2015/day02/problem

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.

   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.

   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 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.

   How many total feet of ribbon should they order?

   Your puzzle answer was 3783758.

   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.

   If you still want to see it, you can get your puzzle input.

References

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