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<bits/stdc++.h>
#include "trilib.h"
using namespace std;
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n=get_n();
set<int>st;
for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++){
if(i==j){
continue;
}
int f1=0,f2=0;
for(int h=1;h<=n;h++){
if(h==i||h==j){
continue;
}
if(is_clockwise(i,j,h)){
f1=1;
}
else{
f2=1;
}
}
if(f1==1&&f2==1){
continue;
}
st.insert(i);
st.insert(j);
}
}
give_answer((int)st.size());
}
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