2023-12-05 12:52:56 -07:00
4 changed files with 571 additions and 0 deletions
--- a/day05/example.txt
+++ b/day05/example.txt
@ -0,0 +1,33 @@
+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
--- a/day05/input.txt
+++ b/day05/input.txt
@ -0,0 +1,250 @@
+seeds: 1263068588 44436703 1116624626 2393304 2098781025 128251971 2946842531 102775703 2361566863 262106125 221434439 24088025 1368516778 69719147 3326254382 101094138 1576631370 357411492 3713929839 154258863
+
+seed-to-soil map:
+2056129205 3495540274 7275274
+2093671499 2217398614 16037515
+144190400 1167267743 4402289
+685148999 560842720 46363553
+148592689 1382926008 71816170
+241575914 1243634776 139291232
+1686196783 543577846 17264874
+2601917866 2486088541 222990187
+1703461657 1454742178 45658441
+4200618033 2052611543 79792525
+2063404479 2445531749 30267020
+3026695548 4113017544 181949752
+73663477 607206273 70526923
+3412143232 2195535041 20126067
+1381626519 809568775 38912495
+4280410558 3277485604 9635485
+1285511345 435930218 30230711
+2009679577 4060471919 23976534
+491535670 129136847 193613329
+3016405776 2475798769 10289772
+2035393617 2709078728 12153762
+1760083914 1171670032 71964744
+3988522413 2233436129 212095620
+2824908053 4084448453 28569091
+799335774 434222608 1707610
+2109709014 3568263067 492208852
+2047547379 3502815548 8581826
+1275917650 466160929 9593695
+731512552 475754624 67823222
+380867146 698900251 110668524
+1315742056 1500400619 65884463
+801043384 848481270 151647344
+3208645300 3292042342 203497932
+952690728 0 129136847
+1081827575 1000128614 167139129
+0 1731434235 73663477
+1749120098 423258792 10963816
+2853477144 3511397374 56865693
+1585688167 322750176 100508616
+3432269299 2721232490 556253114
+1420539014 1566285082 165149153
+2973473810 2009679577 42931966
+220408859 677733196 21167055
+4290046043 3287121089 4921253
+2033656111 2215661108 1737506
+1248966704 1805097712 26950946
+2910342837 2132404068 63130973
+
+soil-to-fertilizer map:
+3192416630 3819045895 47516706
+39972266 597632895 4546595
+2584201752 2580457211 100644566
+2272135078 174545609 40291463
+2819419661 2681101777 89335599
+3239933336 3528823147 72816699
+44518861 2232362178 145175982
+2519969464 2377538160 64232288
+1852478702 2770437376 313570784
+2166049486 2441770448 106085592
+4133995881 3866562601 160971415
+1626150228 975660836 106177604
+2908755260 422379995 175252900
+3312750035 4178991584 115975712
+1142288544 1324281099 483861684
+833150172 1928293653 304068525
+1732327832 1808142783 120150870
+2684846318 39972266 134573343
+3133663001 4027534016 58753629
+189694843 602179490 373481346
+3758375673 4086287645 92703939
+3428725747 3199173221 329649926
+1137218697 2547856040 5069847
+4068485661 3133663001 65510220
+590707513 1081838440 242442659
+2312426541 214837072 207542923
+563176189 2552925887 27531324
+3851079612 3601639846 217406049
+
+fertilizer-to-water map:
+153835826 1814144363 127150990
+1926426485 1614900585 14868868
+2139872846 3136260217 42408895
+3310771078 2202805875 59788141
+83898078 1578023222 36877363
+652411041 1574694502 3328720
+2080480520 3785135933 59392326
+3370559219 3272622808 82257970
+3132498144 2037809941 164995934
+2678755579 3455437189 65205729
+3674754588 3844528259 234175097
+2182281741 3520642918 59000325
+570340096 1492623557 82070945
+2779822218 2446205321 138940597
+2037809941 2703025450 42670579
+3515202222 2342244856 103960465
+3998026660 4136896949 144793347
+955105072 0 84792564
+3452817189 3073875184 62385033
+77176799 1459627033 6721279
+4142820007 4078703356 58193593
+280986816 1091602584 230166265
+1701766245 1321768849 78671169
+2987155826 2872940965 145342318
+2418013523 3615504153 169631780
+2587645303 2262594016 79650840
+2667296143 3354880778 11459436
+2743961308 3579643243 35860910
+1880850385 1046026484 45576100
+3297494078 4281690296 13277000
+2918762815 2804547954 68393011
+1854575140 1466348312 26275245
+3908929685 3366340214 89096975
+511153081 1400440018 59187015
+655739761 864167436 181859048
+120775441 1629769453 33060385
+2241282066 2745696029 58851925
+2300133991 2585145918 117879532
+4201013600 3178669112 93953696
+837598809 84792564 117506263
+1039897636 202298827 661868609
+3619162687 3018283283 55591901
+0 1736967564 77176799
+1780437414 1662829838 74137726
+
+water-to-light map:
+279076302 606101520 367597147
+3291538704 3736283841 125013874
+0 1709355698 279076302
+2106348780 1988432000 822929157
+2929277937 0 362260767
+890514202 2811361157 924922684
+3416552578 973698667 444745137
+1815436886 1418443804 290911894
+646673449 362260767 243840753
+
+light-to-temperature map:
+208346365 819874354 29069132
+731840321 689055790 58614896
+4186248520 4104876526 108718776
+3429769554 3384048873 23936103
+1459123931 2691296758 217855736
+790455217 952719646 105546549
+1416544830 2047230764 42579101
+0 1202755810 208346365
+1399364673 1598820754 17180157
+2576491919 747670686 452381
+901868462 2408707242 282589516
+3626168682 4259315983 35651313
+341191657 748123067 71751287
+2721433915 1411102175 187718579
+3822370242 3740998248 198425166
+3245552556 4213595302 45720681
+1676979667 100628240 254569707
+896001766 2041364068 5866696
+3291273237 3245552556 138496317
+3661819995 3580448001 160550247
+2063025564 380090092 308965698
+4020795408 3939423414 165453112
+237415497 848943486 103776160
+1931549374 1909887878 131476190
+2576944300 1058266195 144489615
+717031505 2089809865 14808816
+412942944 2104618681 304088561
+1209350123 0 100628240
+1309978363 1820501568 89386310
+3453705657 3407984976 172463025
+2371991262 1616000911 204500657
+1184457978 355197947 24892145
+
+temperature-to-humidity map:
+4116612848 1770461885 178354448
+475467700 3077125572 130863723
+1272723717 1181397963 5578998
+3758341401 495891106 279864899
+1687813623 1591451985 2235236
+2530388822 2518678506 215908033
+2282034531 2032693852 208761140
+1471990450 379604394 116286712
+1817301926 3588566075 238614487
+3086830522 2960704657 28309403
+3692580145 2002277669 19886809
+616860797 3221548716 360840790
+3115139925 1226570112 16611162
+336172750 170230298 133118381
+977701587 1693223682 77238203
+1366414227 775756005 105576223
+2055916413 2734586539 226118118
+4038206300 2287329439 78406548
+3712466954 2241454992 45874447
+3556277513 2516499157 2179349
+1278302715 2989014060 88111512
+1588277162 1593687221 99536461
+2746296855 3827180562 340533667
+469291131 3582389506 6176569
+1054939790 1960273136 42004533
+1247816059 3207989295 13559421
+2490795671 1186976961 39593151
+1261375480 1948816333 11348237
+36107015 881332228 300065735
+1096944323 2365735987 150763170
+3131751087 303348679 76255715
+3558456862 36107015 134123283
+3208006802 1243181274 348270711
+606331423 2022164478 10529374
+1690048859 4167714229 127253067
+1247707493 1960164570 108566
+
+humidity-to-location map:
+3760908805 3662107228 155796250
+1580497895 3884288658 144897726
+3166374808 442179790 213926492
+121876139 656106282 138383174
+393463083 2300882189 128101885
+2948945727 3512929162 110263469
+521564968 2652674020 210495874
+1940349169 3864399213 19889445
+1197505529 794489456 93759960
+904168980 2539693608 75416982
+1725395621 3623192631 38914597
+2881030575 888249416 49678445
+2116891732 1943237764 146499392
+979585962 2615110590 37563430
+3143485439 3262014106 22889369
+791255257 4029186384 109003936
+4209132419 4140663408 85834877
+1764310218 192277746 165625801
+2023373170 2466550792 73142816
+4140663408 4226498285 68469011
+2269931546 1003317103 611099029
+1291265489 0 119152028
+2930709020 3243777399 18236707
+732060842 1884043349 59194415
+1410417517 1614416132 170080378
+1960238614 937927861 63134556
+1929936019 2089737156 10413150
+3380301300 2863169894 380607505
+3916705055 3291443897 221485265
+355896365 2428984074 37566718
+2254686 3817903478 46495735
+2096515986 2280506443 20375746
+1017149392 2100150306 180356137
+0 1001062417 2254686
+260259313 1784496510 95637052
+48750421 119152028 73125718
+3059209196 357903547 84276243
+2263391124 3284903475 6540422
+900259193 1880133562 3909787
--- a/day05/main.go
+++ b/day05/main.go
@ -0,0 +1,189 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log/slog"
+	"os"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	var level slog.Level
+	if err := level.UnmarshalText([]byte(os.Getenv("DEBUG_LEVEL"))); err == nil && level != 0 {
+		slog.SetDefault(slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: level})))
+	}
+
+	if len(os.Args) != 2 {
+		fmt.Fprintln(os.Stderr, "Usage: day05 FILE")
+	}
+
+	input, err := os.Open(os.Args[1])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+	}
+
+	scan := bufio.NewScanner(input)
+
+	minLocation, minRangeLocation := run(scan)
+
+	fmt.Println("min location:", minLocation)
+	fmt.Println("min range location:", minRangeLocation)
+
+}
+
+func run(scan *bufio.Scanner) (int, int) {
+	var seeds []int
+	var seedRanges []int
+	lookup := map[string]*Lookup{}
+
+	for scan.Scan() {
+		text := scan.Text()
+		if strings.HasPrefix(text, "seeds:") && len(seeds) == 0 {
+			seeds, seedRanges = readSeeds(text)
+		}
+
+		lookup = readMaps(scan)
+	}
+
+	find := NewFinder(
+		lookup["seed-to-soil"],
+		lookup["soil-to-fertilizer"],
+		lookup["fertilizer-to-water"],
+		lookup["water-to-light"],
+		lookup["light-to-temperature"],
+		lookup["temperature-to-humidity"],
+		lookup["humidity-to-location"],
+	)
+
+	seedLocations := make([]int, len(seeds))
+	for i, s := range seeds {
+		seedLocations[i] = find.Find(s)
+	}
+	minLocation := min(seedLocations...)
+
+	seedRangeLocations := make([]int, len(seedRanges))
+	for i, s := range seedRanges {
+		seedRangeLocations[i] = find.Find(s)
+	}
+	minRangeLocation := min(seedRangeLocations...)
+
+	return minLocation, minRangeLocation
+}
+
+
+func readSeeds(text string) ([]int, []int) {
+	var seeds, seedRanges []int
+	sp := strings.Fields(strings.TrimPrefix(text, "seeds: "))
+	for i, s := range sp {
+		n, _ := strconv.Atoi(s)
+		seeds = append(seeds, n)
+
+		if i%2 == 0 {
+			seedRanges = append(seedRanges, n)
+		} else {
+			lastN := seedRanges[len(seedRanges)-1]
+			r := make([]int, n-1)
+			for i := range r {
+				r[i] = lastN + i + 1
+			}
+			seedRanges = append(seedRanges, r...)
+		}
+	}
+	return seeds, seedRanges
+}
+
+func readMaps(scan *bufio.Scanner) map[string]*Lookup {
+	var cur *Lookup
+	lookup := make(map[string]*Lookup)
+	for scan.Scan() {
+		text := scan.Text()
+
+		if strings.HasSuffix(text, "map:") {
+			if cur != nil {
+				cur.Sort()
+			}
+			cur = &Lookup{}
+			title := strings.TrimSuffix(text, " map:")
+			lookup[title] = cur
+		}
+
+		numbers := strings.Fields(text)
+		if len(numbers) == 3 {
+			rng := make([]int, 3)
+			for i, s := range numbers {
+				n, _ := strconv.Atoi(s)
+				rng[i] = n
+			}
+			cur.Add(rng[1], rng[0], rng[2])
+		}
+	}
+	return lookup
+}
+
+type Range struct {
+	src  int
+	dest int
+	len  int
+}
+type Ranges []Range
+
+func (r Ranges) Len() int           { return len(r) }
+func (r Ranges) Less(i, j int) bool { return r[i].src < r[j].src }
+func (r Ranges) Swap(i, j int)      { r[i], r[j] = r[j], r[i] }
+
+type Lookup struct {
+	ranges Ranges
+}
+
+func (l *Lookup) Add(src, dest, len int) {
+	if l == nil {
+		return
+	}
+	l.ranges = append(l.ranges, Range{src, dest, len})
+}
+func (l *Lookup) Sort() {
+	sort.Sort(sort.Reverse(l.ranges))
+}
+func (l *Lookup) Find(n int) int {
+	for _, r := range l.ranges {
+		if n >= r.src && n <= r.src+r.len {
+			diff := n - r.src
+			if diff < r.len {
+				return r.dest + diff
+			}
+		}
+	}
+
+	return n
+}
+
+type Finder struct {
+	stack []*Lookup
+}
+
+func NewFinder(stack ...*Lookup) *Finder {
+	return &Finder{stack: stack}
+}
+func (f *Finder) Find(n int) int {
+	// fmt.Print("Find: ")
+	for _, l := range f.stack {
+		// fmt.Print(n, "->")
+		n = l.Find(n)
+		// fmt.Print(n, " ")
+	}
+	// fmt.Println("")
+	return n
+}
+
+func min(arr ...int) int {
+	m := arr[0]
+	for _, a := range arr[1:] {
+		if m > a {
+			m = a
+		}
+	}
+	return m
+}
--- a/day05/main_test.go
+++ b/day05/main_test.go
@ -0,0 +1,99 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	minLocation, minRangeLocation := run(scan)
+	is.Equal(minLocation, 35)
+	is.Equal(minRangeLocation, 47)
+}
+
+func SkipTestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	minLocation, minRangeLocation := run(scan)
+	is.Equal(minLocation, 199602917)
+	is.Equal(minRangeLocation, 0)
+
+}
+
+func TestLookup(t *testing.T) {
+	is := is.New(t)
+	find := &Lookup{ranges: Ranges{
+		{98, 50, 2},
+		{50, 52, 48},
+	}}
+	is.Equal(find.Find(79), 81)
+
+	find = &Lookup{ranges: Ranges{
+		{77,45,23},
+		{45,81,19},
+		{64,68,13},
+	}}
+	is.Equal(find.Find(77), 45)
+
+}
+
+func TestFinder(t *testing.T) {
+	is := is.New(t)
+	find := NewFinder(
+		// seed-to-soil
+		&Lookup{ranges: Ranges{
+			{98, 50, 2},
+			{50, 52, 48},
+		}},
+		// soil-to-fertilizer
+		&Lookup{ranges: Ranges{
+			{15, 0,37},
+			{52,37,2},
+			{0,39,15},
+		}},
+		// fertilizer-to-water
+		&Lookup{ranges: Ranges{
+			{53,49,8},
+			{11,0,42},
+			{0,42,7},
+			{7,57,4},
+		}},
+		// water-to-light
+		&Lookup{ranges: Ranges{
+			{18,88,7},
+			{25,18,70},
+		}},
+		// light-to-temperature
+		&Lookup{ranges: Ranges{
+			{77,45,23},
+			{45,81,19},
+			{64,68,13},
+		}},
+		// temperature-to-humidity
+		&Lookup{ranges: Ranges{
+			{69,0,1},
+			{0,1,69},
+		}},
+		// humidity-to-location
+		&Lookup{ranges: Ranges{
+			{56,60,37},
+			{93,56,4},
+		}},
+	)
+	is.Equal(find.Find(82), 46)
+}