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93 lines
1.5 KiB
Go
93 lines
1.5 KiB
Go
package main
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import (
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"bufio"
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"log"
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"os"
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"sort"
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"strconv"
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)
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const bitSize = 40
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func bitComplement(num uint64) uint64 {
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return ^num & (1<<bitSize - 1)
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}
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func partOne(counts *[bitSize]int, total *int) (uint64, uint64) {
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averageThreshold := *total / 2
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var gammaRate uint64 = 0
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for index, count := range counts {
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if count > averageThreshold {
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var add uint64 = 1 << (bitSize - 1 - index)
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gammaRate += add
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}
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}
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epsilonRate := bitComplement(gammaRate)
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return gammaRate, epsilonRate
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}
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func reduce(slice []string, depth int, max bool) int64 {
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var s []string
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half := len(slice) / 2
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if half == 0 {
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ret, _ := strconv.ParseInt(slice[0], 2, 64)
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return ret
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}
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maxDigit := slice[half][depth]
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for _, str := range slice {
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if max && str[depth] == maxDigit {
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s = append(s, str)
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}
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if !max && str[depth] != maxDigit {
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s = append(s, str)
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}
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}
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return reduce(s, depth+1, max)
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}
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func partTwo(s []string) (int64, int64) {
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sort.Strings(s)
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return reduce(s, 0, true), reduce(s, 0, false)
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}
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func solve() {
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file, err := os.Open("bigboi.txt")
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if err != nil {
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log.Fatal(err)
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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scanner.Split(bufio.ScanLines)
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var counts [bitSize]int
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var s []string
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total := 0
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for scanner.Scan() {
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line := scanner.Text()
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for index, character := range line {
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if character == '1' {
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counts[index]++
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}
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}
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s = append(s, line)
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total++
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}
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partOne(&counts, &total)
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//fmt.Println(int64(g) * int64(e))
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partTwo(s)
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//fmt.Println(o * c)
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}
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func main() {
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solve()
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}
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