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>
#include <algorithm>
using namespace std;
int main(){
int n, s1[11], e1[11], s2[11], e2[11];
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]);
s1[i] = max(s1[i],s2[i]);
e1[i] = min(e1[i],e2[i]);
}
int cnt = 0;
for (int i=0; i<n; i++) {
if(s1[i] > e1[i]){
puts("-1");
return 0;
}
if(s1[i] < e1[i]) cnt++;
}
printf("%d",cnt);
}
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