BOJ13223 소금폭탄

https://www.acmicpc.net/problem/13223

13223번: 소금 폭탄

import java.util.*;
import java.io.*;
public class Main
{
	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		String[] str1 = br.readLine().split(":");
		int second1 = Integer.valueOf(str1[0])*60*60+Integer.valueOf(str1[1])*60+Integer.valueOf(str1[2]);
        String[] str2 = br.readLine().split(":");
		int second2 = Integer.valueOf(str2[0])*60*60+Integer.valueOf(str2[1])*60+Integer.valueOf(str2[2]);
        
        int ans = second2-second1;
        if(ans<=0){
            ans+= 24*60*60;
        }
        
        int hours = ans / (60 * 60);
        int minutes = (ans % (60 * 60)) / 60;
        int seconds = ans % 60;

        
        String formattedTime = String.format("%02d:%02d:%02d", hours, minutes, seconds);
        System.out.println(formattedTime);

		
	}
}