package main

import (
	"fmt"
	"strconv"
	"strings"
)

// 其实是一个区间问题
func numberOfRounds(startTime string, finishTime string) int {
	// 1.先计算出玩的总时间
	stArr, edArr := strings.Split(startTime, ":") , strings.Split(finishTime, ":")
	stHour, _ := strconv.Atoi(stArr[0])
	stMin, _ := strconv.Atoi(stArr[1])
	edHour, _ := strconv.Atoi(edArr[0])
	edMin, _ := strconv.Atoi(edArr[1])
	sumTime := 0
	if stHour > edHour || (stHour == edHour && stMin > edMin) {
		sumTime = (24 - (stHour - edHour)) * 60 - stMin + edMin
	}else {
		sumTime = (edHour - stHour) * 60 - stMin + edMin
	}

	if stMin > 0 && stMin < 15 {
		sumTime -= 15 - stMin
	}else if stMin > 15 && stMin < 30 {
		sumTime -= 30 - stMin
	}else if stMin > 30 && stMin < 45 {
		sumTime -= 45 - stMin
	}else if stMin > 45 && stMin < 60 {
		sumTime -= 60 - stMin
	}

	return sumTime / 15
}

/*
"12:01"
"12:44"
"04:54"
"18:51"
"00:01"
"00:00"
"20:00"
"06:00"
"00:00"
"23:59"
*/

func main() {
	fmt.Println(numberOfRounds("04:54", "18:51"))
}