Java 代码

import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
         Scanner cin=new Scanner(System.in);
         int t=cin.nextInt();
         System.out.println(t/3600+":"+t%3600/60+":"+t%60);
    }
}

C++ 代码

/*
1 hour= 60*60 s
1 minute= 60 s
*/
#include<cstdio>
#include<algorithm>
#include<iostream>
using namespace std;
int main()
{
    int t;
    cin>>t;
    printf("%d:%d:%d\n",t/3600,t%3600/60,t%60);
    return 0;
}