aoc_day1_challenge1.rb

array = %w(
  1768
  1847
  1905
  1713
  1826
  1846
  1824
  1976
  1687
  1867
  1665
  1606
  1946
  1886
  1858
  346
  1739
  1752
  1700
  1922
  1865
  1609
  1617
  1932
  1346
  1213
  1933
  834
  1598
  1191
  1979
  1756
  1216
  1820
  1792
  1537
  1341
  1390
  1709
  1458
  1808
  1885
  1679
  1977
  1869
  1614
  1938
  1622
  1868
  1844
  1969
  1822
  1510
  1994
  1337
  1883
  1519
  1766
  1554
  1825
  1828
  1972
  1380
  1878
  1345
  1469
  1794
  1898
  1805
  1911
  1913
  1910
  1318
  1862
  1921
  1753
  1823
  1896
  1316
  1381
  1430
  1962
  1958
  1702
  1923
  1993
  1789
  2002
  1788
  1970
  1955
  1887
  1870
  225
  1696
  1975
  699
  294
  1605
  1500
  1777
  1750
  1857
  1540
  1329
  1974
  1947
  1516
  1925
  1945
  350
  1669
  1775
  1536
  1871
  1917
  1249
  1971
  2009
  1585
  1986
  1701
  1832
  1754
  1195
  1697
  1941
  1919
  2006
  1667
  1816
  1765
  1631
  2003
  1861
  1000
  1791
  1786
  1843
  1939
  1951
  269
  1790
  1895
  1355
  1833
  1466
  1998
  1806
  1881
  1234
  1856
  1619
  1727
  1874
  1877
  195
  1783
  1797
  2010
  1764
  1863
  1852
  1841
  1892
  1562
  1650
  1942
  1695
  1730
  1965
  1632
  1981
  1900
  1991
  1884
  1278
  1062
  1394
  1999
  2000
  1827
  1873
  1926
  1434
  1802
  1579
  1879
  1671
  1549
  1875
  1838
  1338
  1864
  1718
  1800
  1928
  1749
  1990
  1705
)

# Part One

ints = array.map(&:to_i)

def find_pair(array, target)
  found = nil
  array.each do |first|
    array.each do |second|
      found = [first, second] if first + second == target
    end
  end
  found[0] * found[1]
end

p find_pair(ints, 2020)

# Part Two

def find_tripple(array, target)
  found = nil
  array.each do |first|
    array.each do |second|
      array.each do |third|
        found = [first, second, third] if first + second + third == target
      end
    end
  end
  found[0] * found[1] * found[2]
end

p find_tripple(ints, 2020)