9.5 综合实战

// 综合运用时间计算和取整
int students, capacity, start_hour, start_minute;
scanf("%d%d%d:%d", &students, &capacity, &start_hour, &start_minute);

// 计算需要的批次（向上取整）
int batches = (students + capacity - 1) / capacity;

// 每批需要的时间（分钟）
int time_per_batch = 45;

// 计算总共需要的时间
int total_minutes = batches * time_per_batch;

// 计算结束时间
int start_in_minutes = start_hour * 60 + start_minute;
int end_in_minutes = (start_in_minutes + total_minutes) % (24 * 60);

// 转换为时分格式
int end_hour = end_in_minutes / 60;
int end_minute = end_in_minutes % 60;

printf("%d:%dn", end_hour, end_minute);