/
main.go
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/
main.go
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package main
import (
_ "embed"
"fmt"
. "github.com/beanz/advent/lib-go"
)
//go:embed input.txt
var input []byte
type School struct {
init []byte
}
func NewSchool(in []byte) *School {
return &School{FastBytes(in)}
}
func (s *School) Fish(d1, d2 int) (int, int) {
fish := make([]int, 9)
for _, t := range s.init {
fish[t]++
}
for d := 1; d <= d1; d++ {
z := fish[0]
for i := 0; i < 8; i++ {
fish[i] = fish[i+1]
}
fish[6] += z
fish[8] = z
}
p1 := Sum(fish...)
for d := d1 + 1; d <= d2; d++ {
z := fish[0]
for i := 0; i < 8; i++ {
fish[i] = fish[i+1]
}
fish[6] += z
fish[8] = z
}
return p1, Sum(fish...)
}
func main() {
s := NewSchool(InputBytes(input))
p1, p2 := s.Fish(80, 256)
if !benchmark {
fmt.Printf("Part 1: %d\n", p1)
fmt.Printf("Part 2: %d\n", p2)
}
}
var benchmark = false