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, s1[12], e1[12], s2[12], e2[12];
int main() {
	scanf("%d", &n);
	for (int i=0; i<n; ++i)
		scanf("%d%d", s1+i, e1+i);
	for (int i=0; i<n; ++i)
		scanf("%d%d", s2+i, e2+i);
	int ans = n;
	for (int i=0; i<n; ++i) {
		if (s1[i] > e2[i] || s2[i] > e1[i]) {
			ans = -1;
			break;
		}
		if (s1[i] == e2[i] || s2[i] == e1[i])
			--ans;
	}
	printf("%d\n", ans);
	return 0;
}
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