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Advent of Code 2020 Day 19Advent of Code 2020 Day 18Advent of Code 2020 Day 17Advent of Code 2020 Day 16Advent of Code 2020 Day 14Advent of Code 2020 Day 15Advent of Code Day 13Advent of Code 2002 Day 12Advent of Code 2020 Day 11Advent of Code 2020 Day 10Advent of Code 2020 Day 8Advent of Code 2020 Day 9Advent of Code 2020 Day 7Advent of Code 2020 Day 6Advent of Code 2020 Day 5Advent of Code 2020 Day 4Advent Of Code 2020 Day 3Advent of Code 2020 Day 2
Advent of Code 2020 Day 1
md`# Advent of Code 2020 Day 1`
testInput = `1721
979
366
299
675
1456`
testInputs = testInput.split('\n').map( n => parseInt( n ) )
function part1(inputs) {
for (let i=0; i<(inputs.length - 1); i++) {
for (let j=i; j<inputs.length; j++) {
if (inputs[i] + inputs[j] === 2020) {
return inputs[i] * inputs[j];
}
}
}
}
part1(testInputs)
input = `1757
1890
1750
1440
1822
1957
2005
1979
1405
2003
1997
1741
1494
1780
1774
1813
447
1429
1990
1767
1969
1787
1944
1863
1778
2004
1991
1754
1748
1756
1977
611
1934
1818
1924
528
1753
1867
1865
1799
1743
1955
1993
1972
1987
1960
1817
1837
1900
1839
1946
1786
1857
1840
1985
1850
1801
1926
1523
1886
1492
1737
1909
1766
1986
1773
1749
1781
1760
1849
1833
1854
1814
1820
2000
1834
1851
1779
1825
1885
1882
1912
962
1988
302
1965
1751
1764
1844
1949
1984
1933
958
1746
1999
1914
1989
1879
1954
1827
1816
1918
633
1797
1811
1936
1961
1937
1829
1788
1772
1505
1905
1304
1404
1868
1978
1872
2006
1256
1883
1966
1931
1796
1793
714
1904
1841
1824
1962
1739
1897
1906
1735
1876
873
1959
1963
1917
1804
1789
1782
1848
1828
1826
1929
1525
1862
1952
1878
1775
1776
1430
1943
1938
1941
1594
1928
1856
1903
1871
1836
1847
1956
1915
1870
1875
1892
276
1896
1945
1821
1947
1898
1802
1853
1895
1790
1819
1980
1832
1673
1964
1800
1971
1842
2002
1921
1940
1845
1527
1428
1932
1893
1908
1889
1974
1981
1791
1975`
md`## Part 1`
part1( input.split('\n').map(n => parseInt(n)) )
md`## Part 2`
function part2(inputs) {
for (let i=0; i<(inputs.length - 2); i++) {
for (let j=i + 1; j<(inputs.length -1); j++) {
for (let k=j + 1; k< inputs.length; k++) {
if (inputs[i] + inputs[j] + inputs[k] === 2020) {
return inputs[i] * inputs[j] * inputs[k];
}
}
}
}
}
part2( input.split('\n').map(n => parseInt(n)) )
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