Submission #526248

#	Time	Username	Problem	Language	Result	Execution time	Memory
526248		pokmui9909	별자리 2 (JOI14_constellation2)	C++17	55 / 100	9030 ms	360 KiB

constellation2

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using lf = long double;

#define x first
#define y second
using Point = pair<ll, ll>;
Point operator+ (Point p, Point q) {return Point(p.x + q.x, p.y + q.y);}
Point operator- (Point p, Point q) {return Point(p.x - q.x, p.y - q.y);}
ll    operator* (Point p, Point q) {return p.x * q.x + p.y * q.y;}
ll    operator/ (Point p, Point q) {return p.x * q.y - q.x * p.y;}

ll CCW(Point p, Point q, Point r) {return (q - p) / (r - q);}

ll N;
Point A[3005];
ll T[3005];
  
int main(){
    cin.tie(0) -> sync_with_stdio(false);
    
    cin >> N;
    for(int i = 1; i <= N; i++){
        cin >> A[i].x >> A[i].y;
        cin >> T[i];
    }
    ll ans = 0;
    for(int i = 1; i <= N; i++){
        for(int j = i + 1; j <= N; j++){
            vector<ll> X(3), Y(3);
            for(int k = 1; k <= N; k++){
                if(k == i || k == j) continue;
                ll C = CCW(A[i], A[k], A[j]);
                if(C > 0){
                    X[T[k]]++;
                } else {
                    Y[T[k]]++;
                }
            }
            ll pxti = X[T[i]], pytj = Y[T[j]];
            X[T[i]] = Y[T[j]] = 1;

            ans += X[0] * X[1] * X[2] * Y[0] * Y[1] * Y[2];
            X[T[i]] = pxti, Y[T[j]] = pytj;

            X[T[j]] = Y[T[i]] = 1;
            ans += X[0] * X[1] * X[2] * Y[0] * Y[1] * Y[2];
        }
    }
    cout << ans / 2;
}

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 0 / 45