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 <iostream>
using namespace std;
int main()
{
int N;
cin >> N;
int A[24], B[24];
for(int i=0; i<N*2; i++) cin >> A[i];
for(int i=0; i<N*2; i++) cin >> B[i];
int Cnt = 0;
for(int i=0; i<N*2; i+=2)
{
if((A[i]<B[i] && B[i]<A[i+1]) || (A[i]<B[i+1] && B[i+1]<A[i+1])) Cnt++;
}
if(Cnt == 0) cout << "-1";
else cout << Cnt;
cout << endl;
}
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