Submission #3182696

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
  int n;
  cin>>n;
  ll x[111],y[111];
  for(int i=0;i<n;i++)cin>>x[i]>>y[i];
  int ans=0;
  for(int i=0;i<n;i++)
    for(int j=i+1;j<n;j++)
      for(int k=j+1;k<n;k++){
	ll x1=x[i]-x[k];
	ll x2=x[j]-x[k];
	ll y1=y[i]-y[k];
	ll y2=y[j]-y[k];
	ll t=abs(x1*y2-x2*y1);
	if(t&&t%2==0)ans++;
      }
  cout<<ans<<endl;
  return 0;
}

Submission Info

Judge Result