题解 | #kiki算数#

int main()
{
	int a_1 = 0,a_2 = 0,a_3 = 0;
	int b = 0;
	int c = 0;
	int d = 0;

	scanf("%d:%d %d", &a_1,&a_2,&a_3);
	
	c = (a_1 * 60 + a_2 + a_3) / 60;
	d = (a_1 * 60 + a_2 + a_3) % 60;

	if (c > 24)
	{
		c %= 24;
		printf("%02d:%02d\n", c, d);
	}
	else
	{
		printf("%02d:%02d\n", c, d);
	}

	return 0;
}