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 main(void)
{
	int N, s[11], e[11], si, ei, M = 0;
	scanf("%d", &N);
	for (int i = 0; i < N; i++)
	{
		scanf("%d %d", &s[i], &e[i]);
	}
	for (int i = 0; i < N; i++)
	{
		scanf("%d %d", &si, &ei);
		if ((si<s[i] || si>e[i]) && (ei<s[i] || ei>e[i]))
		{
			return -1;
		}
		if ((si>s[i] && si<e[i]) || (ei>s[i] && ei < e[i]))
		{
			M++;
		}
	}
	printf("%d", M);
	return 0;
}
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