题解 | #小乐乐定闹钟#

#include <stdio.h>

int main() {
    int hour, minute, k;
    while ((scanf("%d:%d %d", &hour, &minute,
                  & k) == 3)) { // 注意 while 处理多个 case
        // 64 位输出请用 printf("%lld") to
        int minutes = hour * 60 + minute + k;	//计算所有分钟数
        if (minutes / 60 < 24) {
            printf("%#02d:%#02d\n", minutes / 60, minutes % 60);
        } else {
            printf("%#02d:%#02d\n", minutes / 60 % 24, minutes % 60);
        }
    }
    return 0;
}