Submission #2854476

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Source Code Expand

#include <bits/stdc++.h>
#define int long long
#define rep(i,n) for(int i=0;i<n;i++)
#define Rep(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a,b) for(int i=a;i<=b;i++)
#define rev(i,n) for(int i=n-1;i>=0;i--)
#define vi vector<int>
#define pb push_back
#define pi pair<int,int>
#define vp vector<pair<int,int> >
#define mp make_pair
#define all(v) (v).begin(),(v).end()
using namespace std;

signed main(){
    int n;
    cin>>n;
    int x[n],y[n];
    rep(i,n){
        cin>>x[i]>>y[i];
    }
    int ans=0;
    rep(i,n){
        Rep(j,i+1,n){
            Rep(k,j+1,n){
                int s=(x[k]-x[i])*(y[j]-y[i])-(x[j]-x[i])*(y[k]-y[i]);
                if(s%2==0&&s)ans++;
            }
        }
    }
    cout<<ans<<endl;
    return 0;
}

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