58 lines
1.1 KiB
Go
58 lines
1.1 KiB
Go
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package main
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import (
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"fmt"
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"log"
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"os"
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"strconv"
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)
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func main() {
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inp := 301
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tgt := 50000000
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if len(os.Args) > 2 {
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inp = Atoi(os.Args[1])
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tgt = Atoi(os.Args[2])
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} else if len(os.Args) > 1 {
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fmt.Println("Usage: day17 [skip] [target]")
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fmt.Println("If you provide one argument, you must provide both")
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}
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spinLock := []int{0}
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var addPos int
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for i := 1; i <= tgt; i++ {
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addPos = (addPos + inp) % len(spinLock)
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// Unless we're adding it after the 0, we don't care, just append it.
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if addPos == 0 {
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addPos++
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spinLock = Insert(spinLock, i, addPos)
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} else {
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addPos++
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spinLock = append(spinLock, i)
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}
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}
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fmt.Println(spinLock[0:0+5], "...")
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}
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func Insert(slice []int, val, at int) []int {
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var ret []int
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pt1 := slice[:at]
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pt2 := slice[at:]
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for i := 0; i < len(pt1); i++ {
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ret = append(ret, pt1[i])
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}
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ret = append(ret, val)
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for i := 0; i < len(pt2); i++ {
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ret = append(ret, pt2[i])
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}
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return ret
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}
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func Atoi(i string) int {
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var ret int
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var err error
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if ret, err = strconv.Atoi(i); err != nil {
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log.Fatal("Invalid Atoi")
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}
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return ret
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}
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