99 lines
1.6 KiB
Go
99 lines
1.6 KiB
Go
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package main
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import (
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"bufio"
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"fmt"
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"log"
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"math"
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"os"
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"strconv"
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"strings"
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)
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var lyrs map[int]int
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func main() {
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inp := StdinToStrings()
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lyrs = make(map[int]int)
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for i := range inp {
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pts := strings.Split(inp[i], ":")
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lyrs[Atoi(pts[0])] = Atoi(strings.TrimSpace(pts[1]))
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}
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fmt.Println("== Part 1 ==")
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fmt.Println("Total Severity:", HitchARide(0, false))
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fmt.Println("== Part 2 ==")
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fmt.Println("Delay", FindNoSeverity(), "picoseconds")
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}
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func HitchARide(delay int, brk bool) int {
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var tm, top, sev int
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for k := range lyrs {
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if k > top {
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top = k
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}
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}
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for tm = delay; tm <= (top + delay); tm++ {
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if v, ok := lyrs[(tm - delay)]; ok {
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// There is a scanner here, did it see us?
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if FindPos2(tm, v) == 0 {
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sev += (tm * v)
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if brk {
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return -1
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}
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}
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}
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}
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return sev
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}
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func FindNoSeverity() int {
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maxInt := int((^uint(0) >> 1))
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for i := 0; i < maxInt; i++ {
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if HitchARide(i, true) == 0 {
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return i
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}
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}
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return -1
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}
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func FindPos(tm, lngth int) int {
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var ret int
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var isAsc bool
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for i := tm; i > 0; i-- {
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if ret == lngth-1 || ret == 0 {
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isAsc = !isAsc
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}
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if isAsc {
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ret++
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} else {
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ret--
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}
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}
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return ret
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}
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func FindPos2(tm, lngth int) int {
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loop := (lngth - 1) * 2
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pos := (lngth - 1) - int(math.Abs(float64((lngth-1)-(tm%loop))))
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return pos
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}
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func StdinToStrings() []string {
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var input []string
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scanner := bufio.NewScanner(os.Stdin)
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for scanner.Scan() {
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input = append(input, scanner.Text())
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}
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return input
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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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