[D3] 7732. 시간 개념

#include <stdio.h>
int main() {

	int test_case = 0;
	scanf("%d", &test_case);
	char buffer = 0;
	scanf("%c", &buffer);
	for (int q = 0; q < test_case; q++) {
		int present_hours = 0;
		int present_min = 0;
		int present_second = 0;
		int future_hours = 0;
		int future_min = 0;
		int future_second = 0;
		int remain_hours = 0;
		int remain_second = 0;
		int remain_min = 0;
		scanf("%d:%d:%d",&present_hours,&present_min,&present_second);
		scanf("%d:%d:%d", &future_hours, &future_min, &future_second);
		if (present_hours > future_hours||(present_hours==future_hours&&present_min>future_min)||(present_hours==future_hours&&present_min==future_min&&present_second>future_second)) {
			future_hours += 24;
		}
		if (future_second < present_second) {
			future_min--;
			future_second += 60;
		}
		remain_second = future_second - present_second;
		if (future_min < present_min) {
			future_hours--;
			future_min += 60;
		}
		remain_min = future_min - present_min;
		remain_hours = future_hours - present_hours;
		
		printf("#%d ", q+1);

		if (remain_hours < 10) 
			printf("0%d:", remain_hours);
		else
			printf("%d:", remain_hours);
		if(remain_min<10)
			printf("0%d:", remain_min);
		else
			printf("%d:", remain_min);
		if(remain_second<10)
			printf("0%d", remain_second);
		else
			printf("%d", remain_second);
		printf("\n");

	}

	return 0;
}