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path: root/serial.go
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package main

import "fmt"

var (
	magic1 = []int{
		275, 341, 547, 745, 395, 846, 172, 598, 785,
	}
	magic2 = []int{
		211, 463, 371, 185, 782, 146, 857, 143, 846,
	}
	magic3 = []int{
		17125, 12417, 14983, 1311, 16985, 13198, 12254, 15197, 14365,
	}
	serials = []string{
		"127517125",
		"234112417",
		"354714983",
		"474501311",
		"539516985",
		"684613198",
		"717212254",
		"859815197",
		"978514365",
	}
)

func Check(s string) bool {
	var c, susp, suspen int
	if len(s) != 9 {
		return false
	}
	n, _ := fmt.Sscanf(s, "%1d%3d%5d", &c, &susp, &suspen)
	if n != 3 || c < 1 {
		return false
	}
	c -= 1
	return ((suspen ^ magic3[c]) % magic2[c]) == (susp ^ magic1[c])
}

func main() {
	for _, s := range serials {
		fmt.Println(s, Check(s))
	}
}