题解 | #小乐乐定闹钟#

#include <stdio.h>

int main() {
    int h,m,k;
    scanf("%d:%d %d",&h,&m,&k);

    m=m+k%60;
    if(m>=60){
        m=m-60;
        h++;
    }

    h=h+k/60;
    if(h>=24){
    h=h%24;
    }
    
    printf("%02d:%02d",h,m);
    return 0;
}