oj.uz

답안 #567137

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
567137 2022-05-23T08:22:16 Z 600Mihnea The Forest of Fangorn (CEOI14_fangorn) C++17
50 / 100
 939 ms 468 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef double ld;

struct Vector {
  ll x;
  ll y;
};

Vector operator + (Vector a, Vector b) {
  return { a.x + b.x, a.y + b.y };
}

Vector operator - (Vector a, Vector b) {
  return { a.x - b.x, a.y - b.y };
}

Vector operator * (Vector a, ll b) {
  return { a.x * b, a.y * b };
}


Vector operator * (ll b, Vector a) {
  return { a.x * b, a.y * b };
}


Vector readVector() {
  int x, y;
  cin >> x >> y;
  return { x, y };
}

const int N = 2000 + 7;
const int C = 10000 + 7;

int w, h;
int n, c;
int cnt_good[C];
Vector camps[C];
Vector trees[N];
Vector myself;


bool cmp(pair<Vector, int> a, pair<Vector, int> b) {
  return atan2((ld)a.first.y, (ld)a.first.x) < atan2((ld)b.first.y, (ld)b.first.x);
}

int get_type(Vector a) {

  if (a.x == w) return 0;
  if (a.y == h) return 1;
  if (a.x == 0) return 2;
  if (a.y == 0) return 3;
}

bool cmpOnRect(int i, int j) {
  Vector a = camps[i];
  Vector b = camps[j];

  int type_a = get_type(a);
  int type_b = get_type(b);
  if (type_a != type_b) return type_a < type_b;
  int type = type_a;

  if (type == 0) {
    return a.y < b.y;
  }
  if (type == 1) {
    return a.x > b.x;
  }
  if (type == 2) {
    return a.y > b.y;
  }
  if (type == 3) {
    return a.x < b.x;
  }
}

signed main() {
  ios::sync_with_stdio(0); cin.tie(0);

  cin >> w >> h;
  myself = readVector();

  vector<int> inds;

  cin >> c;
  for (int i = 1; i <= c; i++) {
    camps[i] = readVector();
    inds.push_back(i);
  }
  sort(inds.begin(), inds.end(), cmpOnRect);

  cin >> n;
  for (int i = 1; i <= n; i++) {
    trees[i] = readVector();
  }

  bool is = (n >= 1500);


  for (int tid = 1; tid <= n; tid++) {
    Vector origin = trees[tid];
    vector<pair<Vector, int>> events;
    for (int i = 1; i <= n; i++) {
      if (i == tid) continue;
      Vector delta = trees[i] - origin;
      events.push_back({ {-delta.x,-delta.y}, -1 });
    }
    events.push_back({ myself - origin, 0 });


    if (is) {
      continue;
    }
    auto cop_events = events;

    ld minAng = (ld)1e18;
    int start = -1;

    for (int P = 0; P < c; P++) {
      int i = inds[P];
      Vector vec = camps[i] - origin;
      ld ang = atan2(vec.y, vec.x);
      if (ang < minAng) {
        minAng = ang;
        start = P;
      }
    }

    vector<pair<Vector, int>> cps;
    for (int l = 0; l < c; l++) {
      int i = inds[(start + l) % c];
      cps.push_back({ camps[i] - origin, i });
    }

    sort(cop_events.begin(), cop_events.end(), cmp);
    vector<pair<Vector, int>> so;

    int p1 = 0, p2 = 0;
    while (p1 < (int)cps.size() && p2 < (int)cop_events.size()) {
      if (cmp(cps[p1], cop_events[p2])) {
        so.push_back(cps[p1++]);
      }
      else {
        so.push_back(cop_events[p2++]);
      }
    }
    while (p1 < (int)cps.size()) {
      so.push_back(cps[p1++]);
    }

    while (p2 < (int)cop_events.size()) {
      so.push_back(cop_events[p2++]);
    }

    events = so;
    int p0 = 0;
    while (events[p0].second != 0) p0++;

    int l = p0, r = p0, sz = (int)events.size();

    while (events[(l + sz - 1) % sz].second != -1) l = (l + sz - 1) % sz;
    while (events[(r + 1) % sz].second != -1) r = (r + 1) % sz;

    for (int j = l; j != (r + 1) % sz; j = (j + 1) % sz) {
      if (events[j].second > 0) {
        cnt_good[events[j].second]++;
      }
    }
  }
  vector<int> sol;
  for (int i = 1; i <= c; i++) {
    if (cnt_good[i] == n) {
      sol.push_back(i);
    }
  }
  cout << (int)sol.size() << "\n";
  for (auto& i : sol) {
    cout << i << " ";
  }
  cout << "\n";
}

Compilation message

fangorn.cpp: In function 'int get_type(Vector)':
fangorn.cpp:58:1: warning: control reaches end of non-void function [-Wreturn-type]
   58 | }
      | ^
fangorn.cpp: In function 'bool cmpOnRect(int, int)':
fangorn.cpp:81:1: warning: control reaches end of non-void function [-Wreturn-type]
   81 | }
      | ^

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 4 ms 340 KB Output is correct
8 Correct 3 ms 340 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 2 ms 212 KB Output is correct
3 Correct 4 ms 340 KB Output is correct
4 Correct 4 ms 340 KB Output is correct
5 Correct 6 ms 340 KB Output is correct
6 Correct 13 ms 340 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 3 ms 340 KB Output is correct
10 Correct 26 ms 340 KB Output is correct
11 Correct 22 ms 340 KB Output is correct
12 Correct 34 ms 340 KB Output is correct

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 939 ms 444 KB Output is correct
5 Correct 174 ms 376 KB Output is correct
6 Incorrect 53 ms 436 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 51 ms 468 KB Output isn't correct
2 Halted 0 ms 0 KB -