diff --git a/2023/day05_almanac.go b/2023/day05_almanac.go new file mode 100644 index 0000000..fbf7c87 --- /dev/null +++ b/2023/day05_almanac.go @@ -0,0 +1,99 @@ +package _023 + +import ( + "bufio" + "io" + "slices" + "strconv" + "strings" +) + +func Day05Part1(input io.Reader) (int, error) { + scanner := bufio.NewScanner(input) + + scanner.Scan() + seeds := lineToInts(strings.TrimPrefix(scanner.Text(), "seeds: ")) + + scanner.Scan() + + inMap := false + var currentMap day05Map + for scanner.Scan() { + line := scanner.Text() + if line == "" { + for i, seed := range seeds { + seeds[i] = currentMap.convert(seed) + } + inMap = false + currentMap = nil + } else if strings.HasSuffix(line, "map:") { + inMap = true + } else if inMap { + currentMap = append(currentMap, newDay05Range(line)) + } + } + + if inMap { + // Convert one last time if necessary + for i, seed := range seeds { + seeds[i] = currentMap.convert(seed) + } + } + + return slices.Min(seeds), nil +} + +func Day05Part2(input io.Reader) (int, error) { + scanner := bufio.NewScanner(input) + + for scanner.Scan() { + line := scanner.Text() + _ = line + } + + return 0, nil +} + +func lineToInts(line string) []int { + values := strings.Split(line, " ") + ints := make([]int, len(values)) + for i, value := range values { + number, err := strconv.Atoi(value) + if err != nil { + panic(err) + } + ints[i] = number + } + return ints +} + +type day05Range struct { + destination, source, length int +} + +func newDay05Range(line string) day05Range { + ints := lineToInts(line) + return day05Range{ + destination: ints[0], + source: ints[1], + length: ints[2], + } +} + +func (r day05Range) convert(n int) (int, bool) { + if n >= r.source && n < r.source+r.length { + return n - r.source + r.destination, true + } + return n, false +} + +type day05Map []day05Range + +func (m day05Map) convert(n int) int { + for _, dRange := range m { + if conv, ok := dRange.convert(n); ok { + return conv + } + } + return n +} diff --git a/2023/day05_almanac_test.go b/2023/day05_almanac_test.go new file mode 100644 index 0000000..529c7ff --- /dev/null +++ b/2023/day05_almanac_test.go @@ -0,0 +1,35 @@ +package _023 + +import ( + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" + "os" + "testing" +) + +func TestDay05Part1(t *testing.T) { + tests := []testCase{ + {"inputs/day05_test1", 1}, + {"inputs/day05", 227653707}, + } + for _, test := range tests { + t.Run(test.filename, check(test, Day05Part1)) + } + t.Run("inputs/day05", func(t *testing.T) { + file, err := os.Open("inputs/day05") + require.NoError(t, err) + got, err := Day05Part1(file) + require.NoError(t, err) + assert.Less(t, got, 392296326) // 392296326 is too high + }) +} + +func TestDay05Part2(t *testing.T) { + tests := []testCase{ + {"inputs/day05_test2", 0}, + {"inputs/day05", 0}, + } + for _, test := range tests { + t.Run(test.filename, check(test, Day05Part2)) + } +} diff --git a/2023/inputs/day05 b/2023/inputs/day05 new file mode 100644 index 0000000..efc41fb --- /dev/null +++ b/2023/inputs/day05 @@ -0,0 +1,236 @@ +seeds: 2880930400 17599561 549922357 200746426 1378552684 43534336 155057073 56546377 824205101 378503603 1678376802 130912435 2685513694 137778160 2492361384 188575752 3139914842 1092214826 2989476473 58874625 + +seed-to-soil map: +341680072 47360832 98093750 +1677587229 1836834678 160297919 +1122651749 4014790961 280176335 +2279929873 2689269992 53644948 +3916120104 1199400457 172302726 +0 381576527 58197295 +1402828084 3450816018 274759145 +3909949227 2540063154 6170877 +802918801 2384227172 155835982 +4088422830 3244271552 206544466 +958754783 1997132597 28874650 +58197295 306349987 75226540 +180784667 145454582 160895405 +2334903647 1543332738 293501940 +3699983017 2997982209 25342830 +2333574821 2687941166 1328826 +3111317969 1371703183 171629555 +2806959198 2135774873 248452299 +2766721604 717118138 40237594 +3055411497 2632034694 55906472 +2628405587 3023325039 138316017 +1837885148 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92878428 +2762235329 607630804 135852319 +4210792153 4197161772 84175143 +3149597584 31394121 380867828 +1848709689 0 31394121 +1880103810 412261949 67077829 +285474938 1579019790 1563234751 +2990966076 3566305423 40523883 +2434079297 1019826340 328156032 +2371232521 3985182672 62846776 +1947181639 3142254541 424050882 +3899713715 1347982372 148315733 +3031489959 1496298105 82721685 +4197161772 4281336915 13630381 +3658756438 743483123 240957277 diff --git a/2023/inputs/day05_test1 b/2023/inputs/day05_test1 new file mode 100644 index 0000000..cfe1e53 --- /dev/null +++ b/2023/inputs/day05_test1 @@ -0,0 +1,34 @@ +seeds: 79 14 55 13 + +seed-to-soil map: +50 98 2 +52 50 48 + +soil-to-fertilizer map: +0 15 37 +37 52 2 +39 0 15 + +fertilizer-to-water map: +49 53 8 +0 11 42 +42 0 7 +57 7 4 + +water-to-light map: +88 18 7 +18 25 70 + +light-to-temperature map: +45 77 23 +81 45 19 +68 64 13 + +temperature-to-humidity map: +0 69 1 +1 0 69 + +humidity-to-location map: +60 56 37 +56 93 4 +1 35 1 diff --git a/2023/inputs/day05_test2 b/2023/inputs/day05_test2 new file mode 100644 index 0000000..e69de29