题解 | 不要三句号的歪

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
   scanner := bufio.NewScanner(os.Stdin)
   scanner.Scan()
   in := scanner.Text()

   arr := strings.Split(in, ",")

   end,_ := strconv.ParseInt(arr[3], 10, 64)
   sed,_ := strconv.ParseInt(arr[1], 10, 64)
   first,_ := strconv.ParseInt(arr[0], 10, 64)


   fmt.Println((end-sed)/(sed-first)-1)
}