题解 | #小乐乐定闹钟#

#include <stdio.h>

int main()
 {
    int k,a,b;
    char c;
    scanf("%d%c%d%d",&a,&c,&b,&k);
    int n=a+k/60;
    int m=b+k%60;
    if(m>=60)
    {
        m=m%60;
        n++;//进来的m范围为60<=m<120
    }//以免m>=60
    if(n>=24)
    n=n%24;//以免n>=24
    printf("%02d:%02d",n,m);
    return 0;
}