diff --git a/src/day3/day3.go b/src/day3/day3.go new file mode 100644 index 0000000..76b0c53 --- /dev/null +++ b/src/day3/day3.go @@ -0,0 +1,80 @@ +package main + +import ( + "AOC2021/src/helper" + "encoding/json" + "fmt" + "os" + "strconv" + "strings" +) + +func main() { + args := os.Args[1:] + input, err := helper.GetInput(args[0]) + if err != nil { + fmt.Println(err) + } + intArray := make([][]int, len(input)) + for i,line := range input { + runes := []rune(line) + numbers := helper.RunesToNumber(runes) + intArray[i] = numbers + } + part1(intArray) + part2(intArray) + +} + +func part2(intArray [][]int) { + oxygenGeneratorRating, _ := filterNumbersPart2(append([][]int(nil), intArray...), 0) + co2ScrubberRating, _ := filterNumbersPart2(append([][]int(nil), intArray...), 1) + fmt.Println(co2ScrubberRating * oxygenGeneratorRating) +} + +func part1(intArray [][]int) { + gammaArray := getGammaArray(intArray, 0) + s, _ := json.Marshal(gammaArray) + gammaString := strings.Replace(strings.Trim(string(s), "[]"),",","",-1) + gamma, _ := strconv.ParseInt(gammaString, 2, 64) + invertBinary, _ := strconv.ParseInt(strings.Repeat("1", len(gammaString)), 2, 64) + fmt.Println(gamma * (gamma ^ invertBinary)) +} + +func filterNumbersPart2(intArray [][]int, invert int) (int64, error){ + gammaArray := getGammaArray(intArray, invert) + i := 0 + for len(intArray) > 1 { + n := 0 + for _, number := range intArray { + if number[i] == gammaArray[i] { + intArray[n] = number + n++ + } + } + intArray = intArray[:n] + gammaArray = getGammaArray(intArray, invert) + i++ + } + s, _ := json.Marshal(intArray[0]) + intString := strings.Replace(strings.Trim(string(s), "[]"),",","",-1) + return strconv.ParseInt(intString, 2, 64) +} + +func getGammaArray(intArray [][]int, invert int) []int { + transposedIntArray := helper.Transpose(intArray) + var gammaArray []int + for _, numbers := range transposedIntArray { + gammaArray = append(gammaArray, getBit(numbers, len(transposedIntArray[0]), invert)) + } + return gammaArray +} + +func getBit(numbers []int, length int, invert int) int{ + sum := helper.AddNummbers(numbers...) + returnvalue := 1 + if sum * 2 < length { + returnvalue = 0 + } + return returnvalue ^ invert +} diff --git a/src/day3/day3Input.txt b/src/day3/day3Input.txt new file mode 100644 index 0000000..54742e4 --- /dev/null +++ b/src/day3/day3Input.txt @@ -0,0 +1,1000 @@ +000011000110 +100110100101 +101100101001 +001100010000 +011000100100 +110100101111 +110110001001 +010010100101 +100111000010 +001010110001 +110111010001 +110001011000 +011110010100 +001001010111 +110010111111 +111011010111 +100010001011 +010001100010 +111110111111 +001000101111 +010111110110 +000000001100 +001000110101 +111111010011 +111010011100 +111010010110 +100110011000 +110110000010 +101101011101 +111100000001 +110000101011 +000110111000 +110101110000 +110001100001 +110101001101 +100011011000 +110101000111 +100010100111 +111101001100 +000110000110 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+type convert func(int) string + func GetInput(filename string) ([]string, error) { content, err := ioutil.ReadFile(filename) if err != nil { @@ -37,6 +39,15 @@ func MapToNumber(strings []string) ([]int, error) { return numbers, nil } +func RunesToNumber(runes []rune) []int { + var numbers []int + for _, r := range runes { + number := int(r - '0') + numbers = append(numbers, number) + } + return numbers +} + func FindAddendsForSum(possibleAddends []int, sum int) (int, int, error) { var array = make([]int, len(possibleAddends)) copy(array, possibleAddends) @@ -66,7 +77,7 @@ func SliceIndex(limit int, predicate func(i int) bool) int { return -1 } -func DeleteAt(a []int, i int, ) []int { +func DeleteAt(a []int, i int) []int { return append(a[:i], a[i+1:]...) } @@ -82,9 +93,9 @@ func Equal(a, b []int) bool { return true } -func Contains(elem int, array []int) bool{ - for _, val := range array{ - if val == elem{ +func Contains(elem int, array []int) bool { + for _, val := range array { + if val == elem { return true } } @@ -98,3 +109,13 @@ func AddNummbers(numbers ...int) int { } return result } + +func Transpose(in [][]int) [][]int { + out := make([][]int, len(in[0])) + for i := 0; i < len(in); i += 1 { + for j := 0; j < len(in[0]); j += 1 { + out[j] = append(out[j], in[i][j]) + } + } + return out +}