Day19

2024/gareth/day19/day19.go

@@ -0,0 +1,90 @@
+package day19
+
+import (
+	"strings"
+)
+
+func Part1(input string) int {
+	towelPatterns, designs := parseInput(input)
+	result := countPossibleDesigns(towelPatterns, designs)
+	return result
+}
+
+func Part2(input string) int {
+	towelPatterns, designs := parseInput(input)
+	result := totalArrangements(towelPatterns, designs)
+	return result
+}
+
+func parseInput(input string) ([]string, []string) {
+	parts := strings.SplitN(input, "\n\n", 2)
+	towels := strings.Split(strings.ReplaceAll(parts[0], " ", ""), ",")
+	patterns := strings.Split(strings.TrimSpace(parts[1]), "\n")
+	return towels, patterns
+}
+
+func countPossibleDesigns(towelPatterns []string, designs []string) int {
+	memo := make(map[string]bool)
+	count := 0
+
+	for _, design := range designs {
+		if canConstruct(design, towelPatterns, memo) {
+			count++
+		}
+	}
+
+	return count
+}
+
+func canConstruct(design string, patterns []string, memo map[string]bool) bool {
+	if design == "" {
+		return true
+	}
+	if val, found := memo[design]; found {
+		return val
+	}
+
+	for _, pattern := range patterns {
+		if strings.HasPrefix(design, pattern) {
+			remaining := design[len(pattern):]
+			if canConstruct(remaining, patterns, memo) {
+				memo[design] = true
+				return true
+			}
+		}
+	}
+
+	memo[design] = false
+	return false
+}
+
+func totalArrangements(towelPatterns []string, designs []string) int {
+	memo := make(map[string]int)
+	total := 0
+
+	for _, design := range designs {
+		total += countWays(design, towelPatterns, memo)
+	}
+
+	return total
+}
+
+func countWays(design string, patterns []string, memo map[string]int) int {
+	if design == "" {
+		return 1
+	}
+	if val, found := memo[design]; found {
+		return val
+	}
+
+	totalWays := 0
+	for _, pattern := range patterns {
+		if strings.HasPrefix(design, pattern) {
+			remaining := design[len(pattern):]
+			totalWays += countWays(remaining, patterns, memo)
+		}
+	}
+
+	memo[design] = totalWays
+	return totalWays
+}

2024/gareth/day19/day19_test.go

@@ -0,0 +1,35 @@
+package day19
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`r, wr, b, g, bwu, rb, gb, br
+
+brwrr
+bggr
+gbbr
+rrbgbr
+ubwu
+bwurrg
+brgr
+bbrgwb`)
+	assert.Equal(t, 6, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`r, wr, b, g, bwu, rb, gb, br
+
+brwrr
+bggr
+gbbr
+rrbgbr
+ubwu
+bwurrg
+brgr
+bbrgwb`)
+	assert.Equal(t, 16, r)
+}

2024/gareth/day19/input.txt

@@ -0,0 +1,402 @@
+rrgbg, rgguubg, rbru, rb, rrrw, wbu, gbgb, uururg, ubru, rugb, bbru, b, rggurg, wgru, bgrwb, rrgubg, ubrrbg, wgurru, rrrrw, rbrwu, wubwb, wrbbr, bgbu, brrww, brg, gbwu, wrubuur, gur, grbr, gruwrrbg, bgwr, wgugbgb, rwbru, wuwr, rrg, ruwg, rgwgr, ubu, wbr, bwg, gbu, bgrwrb, wwrw, bb, gr, rug, grr, ubwb, rbruwbu, guggug, ugu, rwbuu, bbur, wbrww, wubw, br, gruu, gwr, wrrwwu, wug, bgu, bgb, wugb, grb, rbbg, grgbwgb, rwu, bwrbb, uwrbbru, bbu, wrg, rwg, ggbgbg, wbwru, wrgrw, bburr, bgr, rgbg, bwwwugrb, uwu, rwuwrg, gguburu, uwubwu, wb, wgguug, ugrbw, rbgu, rwwu, ggbbgb, gw, wgg, rrw, uurg, uubg, bgurgb, uwgbr, wbrwu, rrbb, rww, bwgb, uugru, ggrbub, wubgw, rwwugr, uuwur, burbrg, bbr, ggb, wgr, gwbgw, rrbu, wuwwrwb, rbbr, uubw, buuu, ubbwggu, brr, urguww, uggwwgw, ugw, ug, rub, grrrwu, wurburgg, wwww, ruu, wrb, rrur, urggr, bwbwwwrg, wwbu, bbg, uwb, ggugu, gbbr, rbrgw, bg, bbuu, uwrgrg, ggbwrgw, wwgwugr, wgbwuwb, gbrwg, bbw, wwrgu, rgrwrbwb, wwwg, gugbgbg, bwrwub, rw, gbb, ggw, rrb, urrbbwb, urbu, grg, rbugggb, bruwg, uubgwgw, bw, uubgu, rru, rwww, gu, wrbrg, guu, wgu, ruuru, wubrrg, brugrg, uuggb, wrurg, rgb, rbu, urg, buw, grwbg, gwuw, grbbg, wuwu, gbgbbw, uugrwrww, wbguub, grrgbug, u, uug, uwr, wrwb, gbg, bru, wwg, bbwur, bbbbbbbw, bugbb, rwurrgr, wwb, ugbbw, bug, grgg, bgwgrrb, uggu, rurguru, wwr, rbw, ubwwgw, wrrw, rrbg, g, rgrbub, gruggw, bur, ubgb, bgg, uwur, ur, bbbwb, gwbu, wuww, uruuuubb, wbru, ugggg, gbuu, rgg, wwwug, gbrwgg, guwgr, urw, wbur, bu, rur, rrubr, ugb, ubrgrb, rbbgg, rbwrg, rggw, rguug, wwu, uur, wrrguggu, brbb, bwwwbr, guw, gugw, wgubwu, rrr, ub, ru, brrbbruw, bwwgrrbb, rubgu, uggwwg, wbb, rwr, r, ruuu, wbggg, wwwu, grbrb, rrrrr, ruwb, wuuw, rbbb, ugg, wbg, rguwr, wbw, wbuwg, ubbgrbb, urugu, rbubw, wrgwuuwu, grw, ubbbu, bwurb, rwuu, rgbbwur, urbuu, uww, wuw, bwurgu, wur, wuwwrbur, wwuu, wbgw, grbbbw, wuub, urb, wuuguuwg, wg, gwrgr, gbug, gbrbw, rwgg, brbbu, bwww, wrbbbu, wwgbggb, burug, gww, ubgrrb, bgw, rgbb, brb, wbuu, brw, ggrbrbwg, uwruw, wrgurrbb, guwrgu, rr, ugggrbr, bgrgg, urgbrbrb, wrw, wwubggu, ugurwg, grrg, bwrb, rrgwuuw, rrru, wurg, bgurwu, rgurbb, uuub, uuwb, rrrg, wrgrrrww, uwg, bgbguu, wrgwb, wwwru, rg, rrurwur, urrbb, bww, rrwwbbb, ubr, wgrbu, gru, ubg, gb, ggr, gbwbwru, uuw, rbb, gugwrg, gwb, bbb, rgrggw, uw, wggbbg, rwgubgb, gwbw, brrr, gugbwu, rwrr, uuuwbb, ugrrr, rgu, wubrwr, wrr, bwb, bwbgurb, rrrub, wub, rwgrug, rurb, gwrgrbr, rbrwbb, wwrgbg, urr, bwu, bwgu, rbuuw, bbub, wbbwubu, ggg, wbwwgwb, buwbg, wwwuru, rbg, gubugg, gbwb, www, rbr, ubur, grbbw, wgw, gbw, wgrw, rguuuu, rwb, gbrw, bbbb, gururbb, rbggwu, bub, bgbr, gurb, rrbgrb, rurwb, ugr, wgwrg, ruw, bgrr, gwu, gbr, uwugwru, wru, wr, ugbruw, grbubb, gwg, gwggurg, gugbr, ugubbgb, uwrw, uru, bwr, rgr, rbgrwg, buuw, ugbur, urgub, wurrrgww, rgguuwru, burr, rgw, rbruw, rwbwbbr, bwguw, uub, wgb, rgur, ubb, urwg, rwgww, wgub, rwwrgu, gg, rgug, gub, bggr, uuu, uu, rbug
+
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2024/gareth/main.go

@@ -1,7 +1,7 @@
 package main
 
 import (
-	"aoc2024/day18"
+	"aoc2024/day19"
 	"fmt"
 	"os"
 	"time"
@@ -9,9 +9,9 @@ import (
 
 func main() {
 	start := time.Now()
-	data, _ := os.ReadFile("day18/input.txt")
+	data, _ := os.ReadFile("day19/input.txt")
-	fmt.Printf("part 1: %d\n", day18.Part1(string(data)))
+	fmt.Printf("part 1: %d\n", day19.Part1(string(data)))
-	fmt.Printf("part 2: %d\n", day18.Part2(string(data)))
+	fmt.Printf("part 2: %d\n", day19.Part2(string(data)))
 	elapsed := time.Since(start)
 	fmt.Printf("Execution time: %s\n", elapsed)
 }