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Advent of Code 2020: Day 1 - Report Repair
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| expenses = File.readlines('input.txt').map(&:to_i) | |
| def find_matching_entries(entries, summation = 2020) | |
| entries = entries.dup | |
| while entries.size > 0 | |
| current = entries.shift | |
| match = entries.find do |compare| | |
| current + compare == summation | |
| end | |
| break [current, match] if match | |
| end | |
| end | |
| # This matches 3 numbers. Comment line 19, 21 and 22, and remove 2020 - expense | |
| # to get the result for 2 numbers. | |
| entries = expenses.each do |expense| | |
| entries = find_matching_entries(expenses, 2020 - expense) | |
| break [expense, *entries] if entries | |
| end | |
| puts entries.inject(:*) |
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| 1511 | |
| 1344 | |
| 1925 | |
| 1970 | |
| 1864 | |
| 1951 | |
| 1557 | |
| 1984 | |
| 1743 | |
| 1526 | |
| 1972 | |
| 1945 | |
| 1969 | |
| 1760 | |
| 2008 | |
| 1592 | |
| 736 | |
| 1963 | |
| 1994 | |
| 2009 | |
| 1777 | |
| 1856 | |
| 1899 | |
| 1926 | |
| 1850 | |
| 687 | |
| 2005 | |
| 1094 | |
| 1949 | |
| 1326 | |
| 2002 | |
| 1805 | |
| 1493 | |
| 1341 | |
| 1828 | |
| 1778 | |
| 1767 | |
| 1364 | |
| 1973 | |
| 1768 | |
| 1929 | |
| 1377 | |
| 2000 | |
| 1726 | |
| 1913 | |
| 2001 | |
| 1574 | |
| 1859 | |
| 1793 | |
| 1957 | |
| 1959 | |
| 1388 | |
| 1593 | |
| 1392 | |
| 724 | |
| 1962 | |
| 1999 | |
| 252 | |
| 1982 | |
| 1662 | |
| 1892 | |
| 1610 | |
| 1343 | |
| 1831 | |
| 1862 | |
| 1991 | |
| 1394 | |
| 1946 | |
| 1935 | |
| 1986 | |
| 1911 | |
| 1358 | |
| 1322 | |
| 1956 | |
| 1988 | |
| 1758 | |
| 1490 | |
| 1998 | |
| 1744 | |
| 1844 | |
| 1294 | |
| 1764 | |
| 1543 | |
| 1560 | |
| 1562 | |
| 1747 | |
| 1870 | |
| 1292 | |
| 1989 | |
| 1752 | |
| 1471 | |
| 1980 | |
| 1897 | |
| 1544 | |
| 1914 | |
| 1923 | |
| 1944 | |
| 1375 | |
| 1987 | |
| 1993 | |
| 1742 | |
| 1975 | |
| 1479 | |
| 1977 | |
| 1934 | |
| 1939 | |
| 1950 | |
| 1992 | |
| 1983 | |
| 1474 | |
| 1643 | |
| 2010 | |
| 1814 | |
| 1942 | |
| 322 | |
| 1425 | |
| 1646 | |
| 1878 | |
| 1410 | |
| 1927 | |
| 1761 | |
| 1948 | |
| 1779 | |
| 1753 | |
| 1847 | |
| 274 | |
| 1659 | |
| 1773 | |
| 1960 | |
| 1772 | |
| 1674 | |
| 1809 | |
| 1568 | |
| 1978 | |
| 1952 | |
| 1947 | |
| 1976 | |
| 1953 | |
| 1961 | |
| 1937 | |
| 1932 | |
| 1781 | |
| 2007 | |
| 1941 | |
| 1393 | |
| 1573 | |
| 1745 | |
| 169 | |
| 89 | |
| 1408 | |
| 1974 | |
| 1810 | |
| 1979 | |
| 1967 | |
| 890 | |
| 1958 | |
| 1930 | |
| 1954 | |
| 1759 | |
| 720 | |
| 1936 | |
| 1576 | |
| 1407 | |
| 2004 | |
| 1964 | |
| 1462 | |
| 1875 | |
| 1943 | |
| 1938 | |
| 2006 | |
| 1739 | |
| 1378 | |
| 1922 | |
| 1924 | |
| 2003 | |
| 1792 | |
| 1985 | |
| 1729 | |
| 1966 | |
| 1355 | |
| 1940 | |
| 1928 | |
| 1357 | |
| 1955 | |
| 1896 | |
| 1115 | |
| 1836 | |
| 1971 | |
| 1329 | |
| 1807 | |
| 1997 | |
| 1359 | |
| 1801 | |
| 1933 | |
| 1965 | |
| 1981 | |
| 1711 | |
| 1905 | |
| 1625 | |
| 1968 |
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