题解 | #小乐乐定闹钟#

int main()
{
    int hour,minute,k,i;
    scanf("%d:%d %d", &hour, &minute, &k);
    hour += k / 60;
    minute += k % 60;
    while(minute >= 60)
    {
        minute -= 60;
        hour += 1;
    }
    while(hour > 24)
    {
        hour -= 24;
    }

    printf("%02d:%02d", hour, minute);
    return 0;
}