This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<stdio.h>
int n, w[12][4], i, C;
int main()
{
	scanf("%d", &n);
	for (i = 0; i < n; i++){
		scanf("%d%d", &w[i][0], &w[i][1]);
	}
	for (i = 0; i < n; i++){
		scanf("%d%d", &w[i][2], &w[i][3]);
	}
	for (i = 0; i < n; i++){
		if (w[i][1] < w[i][2] || w[i][3] < w[i][0])break;
		if (w[i][1] != w[i][2] && w[i][3] != w[i][0]) C++;
	}
	if (i != n)printf("-1\n");
	else printf("%d\n", C);
}
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