2022-day4.c

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
	char line[1024];
	FILE *f;
	int count = 0, count2 = 0;

	f = fopen("day4.txt", "r");

	while(1)
	{
		if(!fgets(line, 128, f))
			break;

		int a = -1, b = -1, c = -1, d = -1;

		sscanf(line, "%d-%d,%d-%d\n", &a, &b, &c, &d);

		if((c >= a && d <= b) || (c <= a && d >= b))
		{
			printf("%d-%d,%d-%d matches\n", a, b, c, d);
			count++;
		}

		if((c >= a && c <= b) || (d >= a && d <= b) || (a >= c && b <= d))
		{
			printf("%d-%d,%d-%d overlaps\n", a, b, c, d);
			count2++;
		}
	}

	printf("Count: %d, count2: %d\n", count, count2);

	return 0;
}