Created
December 13, 2020 23:48
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| package main | |
| import ( | |
| "bufio" | |
| "fmt" | |
| "os" | |
| "strconv" | |
| "strings" | |
| "time" | |
| ) | |
| func main() { | |
| t1 := time.Now() | |
| scanner := bufio.NewScanner(os.Stdin) | |
| line := 0 | |
| for scanner.Scan() { | |
| txt := scanner.Text() | |
| line++ | |
| if line == 1 { | |
| continue | |
| } | |
| var start int | |
| var step int | |
| for pos, v := range strings.Split(txt, ",") { | |
| if v == "x" { | |
| continue | |
| } | |
| mul, err := strconv.Atoi(v) | |
| if err != nil { | |
| panic(err) | |
| } | |
| if pos == 0 { | |
| start = pos | |
| step = mul | |
| } else { | |
| start, step = findOne(pos, mul, start, step) | |
| } | |
| } | |
| fmt.Printf("t=%d (%s)\n", start, time.Now().Sub(t1)) | |
| } | |
| } | |
| func findOne(pos, mul, start, step int) (int, int) { | |
| k := 0 | |
| for (start+k*step)%mul != ((mul-pos)%mul+mul)%mul { | |
| k++ // upping the ante | |
| } | |
| return start + k*step, step * mul | |
| } |
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