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<cstdio>
int s[2][11];
int e[2][11];
int main()
{
	int i,j,n,t=0;
	scanf("%d",&n);
	for(i=0;i<2;i++)for(j=0;j<n;j++)scanf("%d%d",&s[i][j],&e[i][j]);
    for(j=0;j<n;j++)
	{
		if(s[0][j]<s[1][j])s[0][j]=s[1][j];
		if(e[0][j]>e[1][j])e[0][j]=e[1][j];
		if(s[0][j]>e[0][j])
		{
			puts("-1");
			return 0;
		}
        t+=s[0][j]<e[0][j];
	}
	printf("%d",t);
}
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