day 1

01/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	data, err := ioutil.ReadFile("numbers")
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	numberStrings := strings.Split(string(data), "\n")
+	var numbers []int
+	for _, i := range numberStrings {
+		if i == "" {
+			break
+		}
+		num, err := strconv.Atoi(i)
+		if err != nil {
+			fmt.Println(err.Error())
+			return
+		}
+		numbers = append(numbers, num)
+	}
+	fmt.Println(part1(numbers))
+	fmt.Println(part2(numbers))
+}
+
+func part1(numbers []int) int {
+	for _, i := range numbers {
+		for _, j := range numbers {
+			if i+j == 2020 {
+				return i * j
+			}
+		}
+	}
+	return 0
+}
+
+func part2(numbers []int) int {
+	for _, i := range numbers {
+		for _, j := range numbers {
+			for _, k := range numbers {
+				if i+j+k == 2020 {
+					return i * j * k
+				}
+			}
+		}
+	}
+	return 0
+}

01/numbers

@@ -0,0 +1,200 @@
+1780
+1693
+1830
+1756
+1858
+1868
+1968
+1809
+1996
+1962
+1800
+1974
+1805
+1795
+170
+1684
+1659
+1713
+1848
+1749
+1717
+1734
+956
+1782
+1834
+1785
+1786
+1994
+1652
+1669
+1812
+1954
+1984
+1665
+1987
+1562
+2004
+2010
+1551
+961
+1854
+2005
+1883
+1965
+475
+1776
+1791
+262
+1912
+1227
+1486
+1989
+1857
+825
+1683
+1991
+1875
+1982
+1654
+1767
+1673
+1973
+1886
+1731
+1745
+1770
+1995
+1721
+1662
+1679
+1783
+1999
+1889
+1746
+1902
+2003
+1698
+1794
+1798
+1951
+1953
+2007
+1899
+1658
+1705
+62
+1819
+1708
+1666
+2006
+1763
+1732
+1613
+1841
+1747
+1489
+1845
+2008
+1885
+2002
+1735
+1656
+1771
+1950
+1704
+1737
+1748
+1759
+1802
+2000
+1955
+1738
+1761
+1765
+1853
+1900
+1709
+1979
+1911
+1775
+1813
+1949
+1966
+1774
+1977
+1757
+1992
+2009
+1956
+1840
+1988
+1985
+1993
+1718
+1976
+1078
+1997
+1897
+1792
+1790
+1801
+1871
+1727
+1700
+1485
+942
+1686
+1859
+1676
+802
+1952
+1998
+1961
+1844
+1808
+1703
+1980
+1766
+1963
+1849
+1670
+1716
+1957
+1660
+1816
+1762
+1829
+526
+359
+2001
+1874
+1778
+1873
+1511
+1810
+1699
+1970
+1690
+1978
+1892
+1691
+1781
+1777
+1975
+1967
+1694
+1969
+1959
+1910
+1826
+1672
+1655
+1839
+1986
+1872
+1983
+1981
+1972
+1772
+1760