Submission #3604672

---

Source Code Expand

#include <bits/stdc++.h>
const int INF = 1e9;
const int MOD = 1e9+7;
using LL = long long;
const LL LINF = 1e18;
const double EPS = 1e-10;
using namespace std;
#define COUT(v) cout<<(v)<<endl
#define COUTDOUBLE(v) cout << std::setprecision(10)<<(v)<<endl;
#define CIN(n)  int(n);cin >> (n)
#define LCIN(n) LL(n);cin >> (n)
#define SCIN(n) string(n);cin >> (n)
#define YES(n) cout<<((n)? "YES" : "NO")<<endl
#define Yes(n) cout<<((n)? "Yes" : "No")<<endl
#define POSSIBLE(n) cout << ((n) ? "POSSIBLE" : "IMPOSSIBLE"  ) << endl
#define Possible(n) cout << ((n) ? "Possible" : "Impossible"  ) <<endl

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) for(int i=0;i<(n);++i)
#define REPR(i,n) for(int i=n;i>=0;i--)

#define FOREACH(x,a) for(auto& (x) : (a) )

#define ALL(obj) (obj).begin(),(obj).end()

#define P pair<LL,LL>
#define I vector<int>
#define pb(v) push_back(v)
#define V vector
#define rt return
#define rmsame(a) sort(ALL(a)),a.erase(unique(ALL(a)), a.end())
#define ENDL cout<<endl
#define f first
#define s second

typedef string::const_iterator State;
class PalseError {};
class Edge{
public:
    int from,to,value;
    Edge(LL a,LL b,LL c){
        from = a;
        to = b;
        value = c;
    }
    Edge(LL a,LL b){
        from = a;
        to = b;
    }
};


bool Judge(P p1, P p2, P p3){
    long double ans = 1.0*1/2 *abs((p1.first-p3.first)*(p2.second-p3.second)-(p2.first-p3.first)*(p1.second-p3.second));
    int ins = ans;
    double ans_ins = ins;
    if(ans_ins == ans && ans != 0.0){
        return true;
    }else{
        return false;
    }
}
int main(){
    CIN(N);
    V<P> vec;
    REP(a,N){
        CIN(A);CIN(B);
        vec.push_back(P(A,B));
    }
    LL ans = 0;
    for(int a = 0;a < N-2;a++){
        for(int b = a+1;b < N-1;b++){
            for(int c = b+1;c < N;c++){
                if(Judge(vec.at(a),vec.at(b),vec.at(c))){
                    ans++;
                }
            }
        }
    }
    COUT(ans);
    return 0;
}

Submission Info

Judge Result