B --1026 program run time

#include<stdio.h>
int main () {
    int C1,C2,hh,mm,ss,time;
    scanf("%d %d",&C1,&C2);
    time = (C2 - C1 + 50) / 100; // add 50
    hh = time/3600;
    time = time%3600;
    ss = time%60;
    mm = time/60;
    printf("%02d:%02d:%02d",hh,mm,ss);
    return 0;
}