PAT(Basic Level)_1026_程序運行時間

#include<stdio.h>

int main(){
    int a,b,h,m,s;
    scanf("%d%d",&a,&b);
    b=(b-a+50)/100;
    h=b/3600;
    m=b/60%60;
    s=b%60;
    printf("%02d:%02d:%02d",h,m,s);

    return 0;
}