题解 | #小乐乐定闹钟#

#include <cstdio>
#include<iostream>
using namespace std;
int main()
{
    int hour,minute,k;
    scanf("%d:%d %d",&hour,&minute,&k);
    int h,m;
    m=(k%60+minute)%60;
    h=(k/60+hour)%24+(k%60+minute)/60;
    
    printf("%02d:%02d",h,m);
    return 0;
}