Submission #1518374

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Source Code Expand

#include<bits/stdc++.h>

using namespace std;
using ll = long long;
using ld = long double;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define reps(i,s,n) for(int i=(int)(s);i<(int)(n);i++)
#define all(c) begin(c),end(c)


int main() {
	cin.sync_with_stdio(false);
	int N;
	cin >> N;
	vector<int>x(N), y(N);
	rep(i, N)cin >> x[i] >> y[i];
	int ans = 0;
	rep(i, N) {
		reps(j, i+1, N) {
			reps(k, j + 1, N) {
				ll x1 = x[j] - x[i], y1 = y[j] - y[i];
				ll x2 = x[k] - x[i], y2 = y[k] - y[i];
				if (x1*y2-y1*x2!=0&&abs(x1*y2 - y1*x2) % 2 == 0)ans++;
			}
		}
	}
	cout << ans << endl;
	return 0;
}

Submission Info

Judge Result