题解 | #小乐乐定闹钟#

#include <stdio.h>

int main() {
    
    int hour = 0,min = 0,k = 0; //时、分、时长
    
    scanf("%d:%d %d", &hour, &min, &k); 
    if(k >= 60)     //时长超过1h
    {
        while (k>=60)   //把时长减小到60分钟内
        {
            hour += 1;
            k -= 60;
            if(hour >= 24)
            {
                hour = 0;
            }
        }
        if((min + k) >= 60) //加上剩余时长仍超过60
        {
            k -= 60;
            min += k;
            hour += 1;
        }
        else    //剩余时长不超过60
        {
            min += k;
        }
        printf("%02d:%02d",hour, min);
    }
    else    //时长不超过1h
    {
        printf("%02d:%02d",hour, min+k);
    }
    return 0;
}