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main.go
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main.go
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package main
import (
_ "embed"
"fmt"
"strconv"
"strings"
)
//go:embed input.txt
var input string
func main() {
count := part1(input)
fmt.Printf("Part 1: %d\n", count)
count = part2(input)
fmt.Printf("Part 1: %d\n", count)
}
func part2(input string) int {
for i := 0; i < 50; i++ {
curr := strings.Builder{}
prev := input[0]
count := 1
for j := 1; j < len(input); j++ {
if input[j] == prev {
count++
continue
} else {
curr.WriteString(strconv.Itoa(count) + string(prev))
prev = input[j]
count = 1
}
}
curr.WriteString(strconv.Itoa(count) + string(prev))
input = curr.String()
}
return len(input)
}
func part1(input string) int {
for i := 0; i < 40; i++ {
curr := strings.Builder{}
prev := input[0]
count := 1
for j := 1; j < len(input); j++ {
if input[j] == prev {
count++
continue
} else {
curr.WriteString(strconv.Itoa(count) + string(prev))
prev = input[j]
count = 1
}
}
curr.WriteString(strconv.Itoa(count) + string(prev))
input = curr.String()
}
return len(input)
}