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답안 #538372

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
538372 2022-03-16T17:04:27 Z Sorting The Forest of Fangorn (CEOI14_fangorn) C++17
0 / 100
 2 ms 340 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long double ld;
typedef long long ll;
template<class T> void check_min(T &a, const T &b){ a = (a < b) ? a : b; }
template<class T> void check_max(T &a, const T &b){ a = (a > b) ? a : b; }
#define all(x) (x).begin(), (x).end()

const ll N = 2000 + 3;
const ll C = 1e4 + 3;
const ll INF = 1e9;

ll n, c, w, h;
ll x, y;
pair<ll, ll> cp[C], tp[N];

ll orient(ll x1, ll y1, ll x2, ll y2, ll x3, ll y3){
    return x1 * y2 + x2 * y3 + x3 * y1 - x1 * y3 - x2 * y1 - x3 * y2;
}

ll sign(ll x){
    return (x == 0) ? 0 : ((x > 0) ? 1 : -1);
}

bool intersect(ll x1, ll y1, ll x2, ll y2, ll x3, ll y3, ll x4, ll y4){
    ll a1 = sign(orient(x1, y1, x2, y2, x3, y3));
    ll a2 = sign(orient(x1, y1, x2, y2, x4, y4));
    ll a3 = sign(orient(x3, y3, x4, y4, x1, y1));
    ll a4 = sign(orient(x3, y3, x4, y4, x2, y2));

    if(a1 + a2 == 2) return false;
    if(a1 + a2 == -2) return false;
    if(a3 + a4 == 2) return false;
    if(a3 + a4 == -2) return false;
    
    return true;
}

array<ll, 4> segmentToLine(ll x1, ll y1, ll x2, ll y2){
    ll x3 = x1 + (x1 - x2) * INF;
    ll y3 = y1 + (y1 - y2) * INF;
    ll x4 = x2 + (x2 - x1) * INF;
    ll y4 = y2 + (y2 - y1) * INF;
    return array<ll, 4>{x3, y3, x4, y4};
}

bool check(ll x1, ll y1, ll x2, ll y2){
    for(int i = 0; i < n; ++i){
        for(int j = i + 1; j < n; ++j){
            auto [x3, y3, x4, y4] = segmentToLine(tp[i].first, tp[i].second, tp[j].first, tp[j].second);
            bool in1 = intersect(x1, y1, x2, y2, tp[i].first, tp[i].second, tp[j].first, tp[j].second);
            bool in2 = intersect(x1, y1, x2, y2, x3, y3, x4, y4);
            if(in2){
                if(!in1){
                    return false;
                }
            }
        }
    }

    return true;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> w >> h >> x >> y;
    w *= 2, h *= 2;
    x *= 2, y *= 2;


    cin >> c;
    for(ll i = 0; i < c; ++i){
        cin >> cp[i].first >> cp[i].second;
        cp[i].first *= 2;
        cp[i].second *= 2;
    }

    cin >> n;
    for(ll i = 0; i < n; ++i){
        cin >> tp[i].first >> tp[i].second;
        tp[i].first *= 2;
        tp[i].second *= 2;
    }

    ll midx = 0, midy = 0;
    for(int i = 0; i < n; ++i){
        midx += tp[i].first;
        midy += tp[i].second;
    }

    midx /= n;
    midy /= n;

    vector<int> ans;
    for(int i = 0; i < c; ++i){
        if(check(x, y, cp[i].first, cp[i].second))
            ans.push_back(i + 1);
        else if(check(x, y, midx, midy) && check(midx, midy, cp[i].first, cp[i].second))
            ans.push_back(i + 1);
    }

    cout << ans.size() << "\n";
    for(int x: ans)
        cout << x << " ";
    cout << "\n";
}

Subtask #1
0.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Correct 1 ms 212 KB Output is correct
3 Incorrect 1 ms 212 KB Output isn't correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Incorrect 1 ms 212 KB Output isn't correct
7 Correct 1 ms 212 KB Output is correct
8 Incorrect 1 ms 212 KB Output isn't correct

Subtask #2
0.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Incorrect 0 ms 212 KB Output isn't correct
4 Correct 0 ms 328 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 324 KB Output is correct
7 Incorrect 0 ms 212 KB Output isn't correct
8 Correct 0 ms 212 KB Output is correct
9 Incorrect 1 ms 212 KB Output isn't correct
10 Incorrect 1 ms 340 KB Output isn't correct
11 Incorrect 1 ms 340 KB Output isn't correct
12 Correct 1 ms 212 KB Output is correct

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Incorrect 1 ms 212 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -