--- 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
requires2*6 + 2*12 + 2*8 = 52
square feet of wrapping paper plus6
square feet of slack, for a total of58
square feet. - A present with dimensions
1x1x10
requires2*1 + 2*10 + 2*10 = 42
square feet of wrapping paper plus1
square foot of slack, for a total of43
square feet.
All numbers in the elves' list are in feet. How many total square feet of wrapping paper should they order?