Day 01

README.md

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+# Advent of Code
+
+This repository contains my solutions for Advent of Code 2020.

day_01/first.rb

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+
+input = File.read('./input').lines.map(&:to_i)
+
+input.each do |i|
+  input.each do |j|
+    (puts i*j; return) if i + j == 2020
+  end
+end

day_01/input

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+1945
+2004
+1520
+1753
+1463
+1976
+1994
+1830
+1942
+1784
+1858
+1841
+1721
+1480
+1821
+1584
+978
+1530
+1278
+1827
+889
+1922
+1996
+1992
+1819
+1847
+2010
+2002
+210
+1924
+1482
+1451
+1867
+1364
+1578
+1623
+1117
+1594
+1476
+1879
+1797
+1952
+2005
+1734
+1898
+1880
+1330
+1854
+1813
+1926
+1686
+1286
+1808
+1876
+1366
+1995
+1632
+1699
+2001
+1365
+1343
+1979
+1868
+1815
+820
+1966
+1888
+1916
+1852
+1932
+1368
+1606
+1825
+1731
+1980
+1990
+1818
+1702
+1419
+1897
+1970
+1276
+1914
+1889
+1953
+1588
+1958
+1310
+1391
+1326
+1131
+1959
+1844
+1307
+1998
+1961
+1708
+1977
+1886
+1946
+1516
+1999
+1859
+1931
+1853
+1265
+1869
+1642
+1740
+1467
+1944
+1956
+1263
+1940
+1912
+1832
+1872
+1678
+1319
+1839
+1689
+1765
+1894
+1242
+1983
+1410
+1985
+1387
+1022
+1358
+860
+112
+1964
+1836
+1838
+1285
+1943
+1718
+1351
+760
+1925
+1842
+1921
+1967
+1822
+1978
+1837
+1378
+1618
+1266
+2003
+1972
+666
+1321
+1938
+1616
+1892
+831
+1865
+1314
+1571
+1806
+1225
+1882
+1454
+1257
+1381
+1284
+1907
+1950
+1887
+1492
+1934
+1709
+1315
+1574
+1794
+1576
+1883
+1864
+1981
+1317
+1397
+1325
+1620
+1895
+1485
+1828
+1803
+1715
+1374
+1251
+1460
+1863
+1581
+1499
+1933
+1982
+1809
+1812

day_01/second.rb

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+# frozen_string_literal: true
+
+input = File.read('./input').lines.map(&:to_i)
+
+input.each do |i|
+  input.each do |j|
+    next if i + j > 2020
+    rem = 2020 - i - j
+
+    if input.include? rem
+      puts i * j * rem 
+      return
+    end
+  end
+end