day 02

01/main.go

@@ -71,10 +71,10 @@ func main() {
 		// find single digits in backward-replaced line
 		lastMatch := nRegex.FindAllStringSubmatch(backwardReplacedLine, -1)
 
-		// get first matchgroup, first match (aka first digit in forwardReplacedLine)
+		// get first match, first matchgroup (aka first digit in forwardReplacedLine)
 		first := firstMatch[0][0]
 
-		// get last matchgroup, first match (aka last digit in backwardReplacedLine)
+		// get last match, first matchgroup (aka last digit in backwardReplacedLine)
 		last := lastMatch[len(lastMatch)-1:][0][0]
 
 		fmt.Println(first + last)

02/go.mod

@@ -1,3 +1,5 @@
 module adventofcode
 
 go 1.21
+
+require github.com/kylelemons/godebug v1.1.0 // indirect

02/go.sum

@@ -0,0 +1,2 @@
+github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
+github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=

02/input.txt

@@ -0,0 +1,100 @@
+Game 1: 1 blue, 1 red; 10 red; 8 red, 1 blue, 1 green; 1 green, 5 blue
+Game 2: 9 green, 11 red; 1 green, 7 red, 1 blue; 1 red, 1 blue, 1 green; 11 green, 3 red, 1 blue; 5 green, 12 red; 8 green, 1 blue, 7 red
+Game 3: 16 blue, 2 red, 4 green; 8 red, 4 green; 7 green, 16 blue
+Game 4: 3 green, 4 blue, 6 red; 7 red, 12 green, 5 blue; 5 green, 16 red, 8 blue
+Game 5: 4 green, 4 blue, 3 red; 4 green, 7 red, 1 blue; 2 blue, 2 red, 4 green; 3 green, 7 red, 4 blue; 2 blue, 3 green, 8 red
+Game 6: 3 green, 4 blue, 10 red; 13 red, 3 green, 4 blue; 11 red; 14 red, 1 green; 6 red, 2 green, 1 blue; 10 red, 1 blue, 1 green
+Game 7: 2 green, 9 red, 9 blue; 12 red, 14 blue; 8 red, 3 green
+Game 8: 9 green, 1 red; 18 green, 2 red, 7 blue; 1 blue, 9 green, 3 red; 3 red, 15 blue, 18 green
+Game 9: 2 red, 1 blue, 10 green; 4 red, 1 blue, 5 green; 6 green, 3 red; 1 green, 2 blue; 8 red
+Game 10: 9 green; 6 red, 4 green, 4 blue; 9 red, 2 blue, 9 green; 8 blue, 9 red, 12 green; 4 red, 8 green, 2 blue; 6 green, 7 blue
+Game 11: 1 blue, 15 red, 2 green; 3 green, 9 red; 1 blue, 3 red, 1 green; 10 red, 1 green; 3 red
+Game 12: 6 blue, 9 red, 4 green; 1 green, 8 blue; 4 green, 8 blue, 1 red; 7 green, 7 blue, 2 red
+Game 13: 11 green, 8 blue, 1 red; 5 blue, 2 red, 5 green; 2 red, 18 green; 5 blue, 5 green, 2 red
+Game 14: 1 red, 4 blue, 3 green; 2 red, 1 green, 1 blue; 1 red, 5 green, 1 blue; 3 red, 4 green, 4 blue
+Game 15: 2 blue, 1 green; 3 red, 2 blue, 7 green; 1 red, 4 green, 15 blue; 1 green, 14 blue, 2 red
+Game 16: 3 red, 10 blue, 9 green; 20 blue, 13 green, 1 red; 9 green, 11 blue, 6 red
+Game 17: 4 red, 1 green, 1 blue; 1 green, 1 red, 11 blue; 1 red, 7 blue
+Game 18: 5 red, 9 green; 17 green, 2 blue, 16 red; 11 red, 2 blue, 1 green
+Game 19: 3 red, 14 green; 4 blue, 1 red, 17 green; 14 green, 3 red, 9 blue; 9 blue, 8 green, 8 red; 4 green, 8 blue
+Game 20: 8 green, 3 blue, 3 red; 5 green, 6 red, 1 blue; 1 blue, 6 red, 13 green; 1 blue, 4 red; 4 red, 4 green, 1 blue
+Game 21: 10 green, 3 blue, 7 red; 4 green, 14 blue, 11 red; 2 red, 8 green, 15 blue; 13 green, 7 blue, 4 red
+Game 22: 3 blue, 11 green, 3 red; 7 green, 2 blue, 2 red; 3 red, 3 blue, 15 green; 12 green, 2 blue, 5 red
+Game 23: 4 red, 3 blue; 2 green, 7 red, 6 blue; 1 green, 2 red, 3 blue
+Game 24: 7 red, 3 green, 2 blue; 3 red, 9 green, 9 blue; 8 green, 6 red, 7 blue
+Game 25: 2 red, 2 green, 2 blue; 3 green, 1 red, 4 blue; 4 red, 3 blue; 4 green, 1 blue, 5 red; 2 green, 4 red, 2 blue; 5 green, 3 red
+Game 26: 1 red, 7 blue, 12 green; 2 blue, 2 red, 7 green; 3 green, 5 red, 6 blue; 8 green, 3 blue, 5 red; 15 green, 7 blue
+Game 27: 4 blue, 7 red, 15 green; 4 red, 1 blue, 15 green; 3 red; 8 red, 4 blue, 10 green; 4 red
+Game 28: 2 blue, 5 red, 8 green; 13 red, 9 green; 2 blue, 4 red, 5 green; 1 blue, 14 green, 12 red; 13 green, 11 red, 3 blue
+Game 29: 7 green, 10 red; 9 green, 2 red, 1 blue; 3 blue, 13 green, 5 red
+Game 30: 3 green, 6 blue, 5 red; 3 green, 1 red, 13 blue; 2 red, 2 green, 7 blue; 13 red, 2 green, 9 blue; 2 blue, 7 red, 2 green
+Game 31: 8 red, 16 green, 1 blue; 10 red, 3 blue, 11 green; 2 green, 4 blue, 3 red; 2 blue, 7 red, 12 green; 16 green, 9 red, 6 blue; 8 blue, 9 red, 11 green
+Game 32: 6 red, 3 green, 7 blue; 3 green, 7 blue, 3 red; 4 green, 1 red, 7 blue; 7 blue, 6 green, 5 red; 9 green, 11 red
+Game 33: 8 green, 6 blue; 2 green, 8 red, 1 blue; 12 green, 4 blue, 14 red; 11 blue, 1 green, 7 red; 1 blue, 5 green, 9 red; 7 green, 7 red, 5 blue
+Game 34: 5 blue, 6 green, 7 red; 6 blue, 5 green, 10 red; 9 red, 3 blue, 7 green; 9 red, 4 green; 15 red, 6 green, 4 blue
+Game 35: 6 blue, 4 green, 7 red; 2 blue, 6 red; 4 green, 11 red, 2 blue; 2 red, 1 blue, 4 green; 10 red, 10 blue, 1 green; 11 blue, 4 green
+Game 36: 13 blue, 6 green, 7 red; 5 red, 9 blue, 9 green; 6 red, 2 blue, 3 green; 2 blue, 7 green; 7 red, 5 blue; 12 blue, 7 red, 3 green
+Game 37: 2 red, 12 green, 3 blue; 6 red, 4 blue; 3 blue, 1 green; 4 red, 5 blue, 6 green
+Game 38: 3 red, 16 blue, 10 green; 6 red, 5 green, 5 blue; 7 blue, 12 red, 5 green
+Game 39: 17 red, 4 green, 6 blue; 6 blue, 11 red; 18 red, 3 green, 1 blue; 3 blue, 6 red, 2 green; 19 red, 5 blue
+Game 40: 1 red, 2 green, 3 blue; 6 blue, 5 green, 1 red; 5 green, 1 blue
+Game 41: 7 blue, 6 green; 8 blue, 2 red, 3 green; 2 blue, 3 green; 3 green, 7 red, 17 blue
+Game 42: 6 blue; 10 red, 5 blue, 14 green; 1 blue, 11 green; 6 blue, 2 green, 5 red; 7 blue, 13 green, 11 red
+Game 43: 15 green, 3 blue; 7 blue, 14 green; 11 blue, 3 green; 17 green, 1 red, 1 blue; 17 green, 2 blue, 1 red
+Game 44: 11 red, 4 blue, 16 green; 11 blue, 16 green; 14 red, 10 blue, 17 green
+Game 45: 6 blue; 6 green, 6 blue, 1 red; 5 blue, 11 green; 4 green, 6 blue
+Game 46: 6 green, 3 blue, 2 red; 9 green, 4 red, 2 blue; 9 green, 1 red, 3 blue
+Game 47: 6 red, 3 blue, 9 green; 3 green, 11 blue; 4 blue, 1 red; 11 green, 11 blue
+Game 48: 13 blue, 15 red; 9 red, 9 blue; 15 green, 9 red, 1 blue
+Game 49: 8 green, 4 red; 1 red, 6 blue; 5 blue, 8 green; 1 red, 2 green, 3 blue; 2 red, 5 blue, 5 green
+Game 50: 1 red, 8 green, 3 blue; 1 blue, 9 green; 3 green, 6 blue
+Game 51: 8 green, 8 red, 8 blue; 9 green, 2 red, 6 blue; 1 green, 1 red, 1 blue; 5 blue, 1 red, 7 green; 7 blue, 5 red, 5 green
+Game 52: 2 green, 1 red; 4 blue, 7 red, 2 green; 3 red, 4 blue; 1 green, 1 blue, 7 red; 8 red, 1 green, 8 blue; 4 blue, 3 green, 4 red
+Game 53: 9 blue, 9 red; 3 blue, 3 green, 5 red; 1 green, 6 blue, 2 red; 4 red, 3 green, 3 blue
+Game 54: 1 blue, 2 red, 2 green; 6 green, 1 blue, 3 red; 1 green, 1 blue
+Game 55: 14 red, 8 blue; 9 red, 2 green, 8 blue; 6 blue, 11 red, 1 green; 10 red, 3 blue, 4 green; 13 red, 2 green, 4 blue; 5 green, 5 blue, 3 red
+Game 56: 12 green, 3 blue; 1 red, 13 green, 5 blue; 17 blue, 6 red, 2 green; 4 red, 12 green, 12 blue
+Game 57: 9 green, 9 red, 10 blue; 10 blue, 10 red, 9 green; 4 blue, 14 red, 8 green; 14 red, 7 green; 10 green, 3 blue, 7 red; 1 red, 2 blue, 1 green
+Game 58: 1 green, 9 red, 11 blue; 5 green, 11 red, 6 blue; 2 green, 3 red, 8 blue; 2 green, 14 blue, 4 red; 9 blue, 1 red
+Game 59: 10 blue, 13 green, 3 red; 4 red, 12 green, 8 blue; 4 red, 9 blue, 10 green; 17 green, 5 red, 7 blue; 4 red, 3 blue, 10 green
+Game 60: 4 green; 5 blue, 8 red; 19 red, 3 blue, 2 green; 4 green, 14 blue, 3 red
+Game 61: 2 red, 6 blue; 15 blue, 5 red; 1 green, 2 red; 1 green, 2 blue, 8 red; 7 red, 10 blue; 11 blue
+Game 62: 10 blue, 2 green, 7 red; 2 red, 2 green, 10 blue; 5 red
+Game 63: 19 red; 1 green, 2 blue, 3 red; 1 blue, 11 red
+Game 64: 11 red, 3 green; 3 red, 1 blue, 3 green; 2 green, 2 red, 4 blue; 9 red, 1 green; 3 green, 7 red, 4 blue; 9 red, 2 blue, 3 green
+Game 65: 2 red, 12 green; 3 red, 3 green; 8 green, 1 blue, 4 red; 2 red, 3 green
+Game 66: 4 blue, 11 red, 15 green; 1 blue, 2 green, 10 red; 4 red, 5 green; 16 red, 16 green, 4 blue
+Game 67: 6 red, 1 green; 1 green, 1 blue, 12 red; 11 red, 2 blue
+Game 68: 4 green, 5 red; 9 blue, 1 red; 1 green, 2 red, 7 blue; 6 red, 5 green, 8 blue; 2 green, 7 red, 2 blue
+Game 69: 9 red, 16 green, 12 blue; 5 red, 4 green, 3 blue; 6 green, 11 blue, 6 red; 13 green, 16 blue, 7 red; 1 red, 8 blue, 14 green
+Game 70: 7 red, 5 blue, 4 green; 6 red, 12 blue, 13 green; 5 green, 4 red, 8 blue; 9 blue, 5 green, 2 red
+Game 71: 15 red, 3 green, 3 blue; 1 red, 5 green, 6 blue; 6 green, 7 blue, 16 red
+Game 72: 4 blue, 4 green, 6 red; 9 green, 2 blue; 15 green, 5 red
+Game 73: 1 green, 7 red; 6 red, 2 blue; 5 red, 9 blue; 12 blue, 9 red
+Game 74: 6 blue, 4 red, 4 green; 17 green, 1 blue; 4 blue, 7 green, 4 red
+Game 75: 3 green, 2 blue, 10 red; 17 red, 14 green, 2 blue; 2 green, 1 blue, 14 red; 16 red, 1 blue, 9 green; 14 red, 1 blue, 9 green
+Game 76: 1 red, 10 green, 4 blue; 4 blue, 4 red, 7 green; 1 red, 2 blue, 15 green; 5 blue, 7 green, 1 red; 5 blue, 3 red, 17 green; 18 green, 4 blue, 1 red
+Game 77: 4 green, 5 blue, 7 red; 3 blue, 4 red, 5 green; 1 red, 1 green; 6 green, 4 blue, 16 red
+Game 78: 2 blue, 9 red; 7 red, 3 blue, 18 green; 2 blue, 12 green
+Game 79: 3 red, 10 green, 10 blue; 10 blue, 12 green; 7 green, 10 blue, 3 red
+Game 80: 10 green, 2 blue, 14 red; 3 blue, 4 red; 12 green; 3 red, 2 blue, 1 green; 10 red, 12 green, 2 blue
+Game 81: 1 green, 3 red, 6 blue; 5 blue, 1 red, 1 green; 6 blue, 9 red
+Game 82: 3 blue, 11 red, 20 green; 15 red, 5 green, 3 blue; 4 red, 7 green, 3 blue
+Game 83: 5 red, 12 blue, 6 green; 11 green, 9 blue, 6 red; 6 green, 1 red, 7 blue; 16 blue, 4 red; 3 green, 6 blue
+Game 84: 3 red, 3 blue, 2 green; 3 red, 9 green; 2 blue, 11 green, 1 red; 1 red, 11 green, 1 blue
+Game 85: 11 green, 1 red, 2 blue; 6 red, 8 green, 14 blue; 3 red, 6 green, 15 blue; 9 blue, 7 red, 1 green; 19 blue, 2 green, 5 red; 6 blue, 7 red, 6 green
+Game 86: 11 red, 4 green; 2 green, 1 blue, 10 red; 11 red, 3 blue, 9 green
+Game 87: 2 green, 17 blue; 12 blue, 3 red, 2 green; 3 green, 2 blue, 13 red; 6 red, 3 green; 13 blue, 11 red, 3 green; 5 blue, 7 red, 1 green
+Game 88: 1 red, 12 green; 4 green, 3 blue; 6 blue, 12 green; 1 red, 2 blue
+Game 89: 9 green, 2 red, 12 blue; 19 green, 12 blue, 3 red; 2 red, 8 blue, 11 green; 13 blue, 8 red, 9 green
+Game 90: 2 red, 2 blue, 7 green; 7 green, 2 red, 12 blue; 6 red, 9 green, 5 blue
+Game 91: 14 blue, 2 red, 7 green; 7 blue, 7 green; 1 red, 5 green, 10 blue; 4 red, 7 blue, 4 green; 5 green, 1 red, 13 blue; 5 green, 1 red
+Game 92: 6 green, 4 blue, 7 red; 18 blue, 3 red; 6 red, 2 blue; 16 blue, 5 red, 3 green
+Game 93: 6 red, 17 blue, 5 green; 14 red, 16 blue, 10 green; 11 blue, 7 red, 11 green; 6 blue, 7 green, 3 red; 17 blue, 1 green
+Game 94: 4 green, 9 blue; 2 green, 6 red, 3 blue; 5 red, 4 green, 8 blue; 4 green, 5 red, 6 blue; 7 green, 7 red, 6 blue
+Game 95: 6 blue, 2 red, 3 green; 9 green, 2 blue; 2 red, 4 blue, 11 green; 4 blue, 4 red, 8 green; 13 green, 5 red, 7 blue; 4 red, 15 green, 2 blue
+Game 96: 5 red, 8 blue, 5 green; 12 blue, 2 red; 15 blue, 2 red, 1 green; 4 red, 1 green
+Game 97: 5 red, 5 blue; 1 red, 11 blue; 3 green, 10 blue; 3 green, 1 red, 7 blue; 2 blue, 6 red; 1 red, 1 green, 8 blue
+Game 98: 4 red, 3 blue, 8 green; 5 blue, 2 red, 8 green; 7 green, 10 red, 2 blue; 11 blue, 9 red, 9 green; 6 blue, 10 green, 11 red
+Game 99: 7 green, 3 red, 9 blue; 3 blue, 5 red, 4 green; 2 red, 6 green, 1 blue; 12 blue, 1 red, 1 green; 11 green, 1 red, 12 blue
+Game 100: 2 blue, 1 red; 4 blue, 2 red, 1 green; 7 red, 5 blue; 2 red, 1 green, 5 blue

02/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"math"
 	"os"
 	"regexp"
 	"strconv"
@@ -11,18 +12,17 @@ import (
 
 var (
 	inputFile   = flag.String("input", "input.txt", "input filename")
-	nRegex    = regexp.MustCompile(`(?m)\d`)
+	subsetRegex = regexp.MustCompile(`(?mi)(\d+)+\s(\w+)([,;]?)`)
-	reMap     = map[string]string{
+	startRegex  = regexp.MustCompile(`(?mi)Game\s(\d+):`)
-		"one":   "1",
+)
-		"two":   "2",
+
-		"three": "3",
+const (
-		"four":  "4",
+	BlueCube  = "blue"
-		"five":  "5",
+	GreenCube = "green"
-		"six":   "6",
+	RedCube   = "red"
-		"seven": "7",
+	MaxRed    = 12
-		"eight": "8",
+	MaxGreen  = 13
-		"nine":  "9",
+	MaxBlue   = 14
-	}
 )
 
 func main() {
@@ -32,61 +32,64 @@ func main() {
 		panic(err)
 	}
 
-	var sum int
+	var sum, powSum int
 	for _, line := range strings.Split(string(input), "\n") {
 		if strings.TrimSpace(line) == "" {
 			continue
 		}
 
-		// forward-scan for spelled digits
+		// find id
-		var forwardReplacedLine, backwardReplacedLine string
+		idMatch := startRegex.FindAllStringSubmatch(line, -1)
-		for i := 0; i < len(line); i++ {
+		id, err := strconv.Atoi(idMatch[0][1])
-			forwardReplacedLine += string(line[i])
-
-			// replace all potential spelled out digits by their non-word counterpart (e.g. "one" -> "1")
-			for key, val := range reMap {
-				forwardReplacedLine = strings.ReplaceAll(forwardReplacedLine, key, val)
-			}
-		}
-		fmt.Println(forwardReplacedLine)
-
-		// backward-scan for spelled digits
-		for i := len(line) - 1; i >= 0; i-- {
-			if i == len(line)-1 {
-				backwardReplacedLine = string(line[i])
-			} else {
-				backwardReplacedLine = string(line[i]) + backwardReplacedLine
-			}
-
-			// replace all potential spelled out digits by their non-word counterpart (e.g. "one" -> "1")
-			for key, val := range reMap {
-				backwardReplacedLine = strings.ReplaceAll(backwardReplacedLine, key, val)
-			}
-		}
-		fmt.Println(backwardReplacedLine)
-
-		// find single digits in forward-replaced line
-		firstMatch := nRegex.FindAllStringSubmatch(forwardReplacedLine, -1)
-
-		// find single digits in backward-replaced line
-		lastMatch := nRegex.FindAllStringSubmatch(backwardReplacedLine, -1)
-
-		// get first matchgroup, first match (aka first digit in forwardReplacedLine)
-		first := firstMatch[0][0]
-
-		// get last matchgroup, first match (aka last digit in backwardReplacedLine)
-		last := lastMatch[len(lastMatch)-1:][0][0]
-
-		fmt.Println(first + last)
-
-		// concatenate digits and convert the resulting string to int
-		asInt, err := strconv.Atoi(first + last)
 		if err != nil {
 			panic(err)
 		}
 
-		sum += asInt
+		// find sets of digit + color + separator (e.g. "3 blue,")
+		subsets := subsetRegex.FindAllStringSubmatch(line, -1)
+
+		var red, green, blue int
+		var minRed, minGreen, minBlue int
+		possible := true
+
+		for _, subset := range subsets {
+			cubeAmount, err := strconv.Atoi(subset[1])
+			if err != nil {
+				panic(err)
 			}
 
-	fmt.Println(sum)
+			// add cube amount to set
+			switch strings.ToLower(subset[2]) {
+			case BlueCube:
+				blue += cubeAmount
+			case GreenCube:
+				green += cubeAmount
+			case RedCube:
+				red += cubeAmount
+			}
+
+			// end of set reached
+			if subset[3] == "" || subset[3] == ";" {
+				if red > MaxRed || green > MaxGreen || blue > MaxBlue {
+					possible = false
+				}
+				minBlue = int(math.Max(float64(minBlue), float64(blue)))
+				minRed = int(math.Max(float64(minRed), float64(red)))
+				minGreen = int(math.Max(float64(minGreen), float64(green)))
+				red = 0
+				blue = 0
+				green = 0
+			}
+		}
+
+		// end of game reached
+		powSum += minRed * minGreen * minBlue
+		if possible {
+			fmt.Printf("%d possible\n", id)
+			sum += id
+		}
+	}
+
+	fmt.Printf("Sum of IDs: %d\n", sum)
+	fmt.Printf("Sum of the power of sets: %d", powSum)
 }

02/test_input.txt

@@ -0,0 +1,5 @@
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green