13 lines
413 B
Ruby
13 lines
413 B
Ruby
|
def find_product_of(n)
|
||
|
|
puts File
|
||
|
|
.readlines("input.txt") # read input lines as array entries
|
||
|
|
.map(&:to_i) # convert each array entry to integer
|
||
|
|
.permutation(n) # create Enumerable with all permutations of n entries
|
||
|
|
.find { |array| array.sum == 2020} # find a permutation that sums to 2020
|
||
|
|
.inject(:*) # get the product of that array
|
||
|
|
end
|
||
|
|
|
||
|
|
puts "Part 1: "
|
||
|
|
find_product_of(2)
|
||
|
|
puts "Part 2: "
|
||
|
|
find_product_of(3)
|