C++ 代码

#include<iostream>

using namespace std;

int main(){

    int n;
    cin>>n;
    int hour,minute,second;
    hour = n/3600;
    minute = (n%3600)/60;
    second = n - hour*3600 - minute*60;

    printf("%d:%d:%d",hour,minute,second);
    return 0;
}