oj.uz

답안 #955922

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
955922 2024-03-31T17:33:12 Z chrisvilches Dragon 2 (JOI17_dragon2) C++14
60 / 100
 4000 ms 5300 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

ll Bx, By;

struct Point {
  ll x, y;
  int idx;
  Point operator-(const Point p) const { return {x - p.x, y - p.y, idx}; }
  Point operator+(const Point p) const { return {x + p.x, y + p.y, idx}; }
  ll cross(const Point p) const { return x * p.y - y * p.x; }
  bool operator<(const Point p) const { return to_upper().cross(p.to_upper()) > 0; }
  Point to_upper() const { return above() ? *this : negate(); }
  bool above() const {
    // TODO: Improve this
    const Point B{Bx, By, idx};
    return B.cross(*this) > 0;
  }
  ll operator*(const Point p) const { return x * p.x + y * p.y; }
  bool deg0(const Point p) const { return cross(p) == 0 && *this * p >= 0; }
  bool deg180(const Point p) const { return cross(p) == 0 && *this * p < 0; }
  Point negate() const { return {-x, -y, -1}; }
};

short sgn(const ll x) { return (x > 0) - (x < 0); }

short orientation(const Point& o, const Point& a, const Point& b) {
  // assert((a - o).cross(b - o) != 0);
  return sgn((a - o).cross(b - o));
}

template <class T>
struct BIT {
  BIT(const int n) : n(n) { bit.assign(n, 0); }
  // void clear(const int n) { memset(bit, 0, n * sizeof(T)); }

  T sum(int l, int r) { return sum(r) - sum(l - 1); }

  void add(int idx, const T delta) {
    for (; idx < n; idx = idx | (idx + 1)) bit[idx] += delta;
  }

 private:
  int n;
  vector<T> bit;

  T sum(int r) {
    T ret = 0;
    for (; r >= 0; r = (r & (r + 1)) - 1) ret += bit[r];
    return ret;
  }
};

unordered_map<int, vector<Point>> order_by_b;

bool cmp_by_b(Point p, Point q) {
  p.x -= Bx;
  q.x -= Bx;
  p.y -= By;
  q.y -= By;
  const bool a1 = p.above();
  const bool a2 = q.above();
  if (a1 != a2) return a1;
  return p.cross(q) > 0;
}

int handle_query(const vector<Point>& points1, const vector<Point>& points2,
                 const vector<Point>& ord_b, const Point B) {
  if (points1.empty() || points2.empty()) return 0;

  BIT<short> active(points2.size());

  for (const auto& q : points2) {
    if (!q.above()) {
      active.add(q.idx, 1);
    }
  }

  int total = 0;

  int j = 0;
  for (const Point& p : points1) {
    while (j < (int)points2.size()) {
      const Point q = points2[j];

      if (q.to_upper().cross(p.to_upper()) < 0) break;
      active.add(q.idx, q.above() ? 1 : -1);

      j++;
    }

    Point from_point = p;
    Point to_point = B + (p - B).negate();

    if (!p.above()) swap(from_point, to_point);

    // total += 1;
    // continue;

    const auto it1 = lower_bound(ord_b.begin(), ord_b.end(), from_point, cmp_by_b);
    const auto it2 = lower_bound(ord_b.begin(), ord_b.end(), to_point, cmp_by_b);

    const int from = it1 - ord_b.begin();
    const int to = it2 - ord_b.begin();

    total += active.sum(from, to - 1);
  }

  return total;
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int N, M, Q;

  while (cin >> N >> M) {
    vector<vector<Point>> tribe_points(M + 1);
    for (int i = 0; i < N; i++) {
      Point p;
      int tribe;
      cin >> p.x >> p.y >> tribe;
      tribe_points[tribe].push_back(p);
    }

    Point A;
    cin >> A.x >> A.y;
    cin >> Bx >> By;
    cin >> Q;

    Bx -= A.x;
    By -= A.y;

    for (auto& points : tribe_points) {
      for (auto& p : points) p = p - A;
    }

    for (int m = 0; m <= M; m++) {
      auto& points = tribe_points[m];

      sort(points.begin(), points.end(), cmp_by_b);
      for (int i = 0; i < (int)points.size(); i++) {
        points[i].idx = i;
      }
      order_by_b[m] = tribe_points.at(m);
    }

    for (auto& points : tribe_points) {
      sort(points.begin(), points.end());
    }

    const Point B{Bx, By, -1};

    // map<pair<int, int>, int> memo;

    const Point origin{0, 0, -1};
    // const Point origin = A;

    while (Q--) {
      int i, j;
      cin >> i >> j;
      // if (memo.count({i, j})) {
      //   cout << memo.count({i, j}) << '\n';
      //   continue;
      // }

      if (tribe_points[i].size() > 1000 || tribe_points[j].size() > 1000) {
        const int ans =
            handle_query(tribe_points.at(i), tribe_points.at(j), order_by_b.at(j), B);
        cout << ans << '\n';
      } else {
        int total = 0;
        for (const Point& p : tribe_points[i]) {
          for (const Point& q : tribe_points[j]) {
            if (orientation(origin, B, p) == 1) {
              if (orientation(B, p, q) == 1 && orientation(p, origin, q) == 1) total++;
            } else {
              if (orientation(origin, p, q) == 1 && orientation(p, B, q) == 1) total++;
            }
          }
        }
        cout << total << '\n';
      }
    }
  }
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 600 KB Output is correct
2 Correct 16 ms 600 KB Output is correct
3 Correct 18 ms 600 KB Output is correct
4 Correct 25 ms 860 KB Output is correct
5 Correct 20 ms 856 KB Output is correct
6 Correct 2 ms 860 KB Output is correct
7 Correct 2 ms 860 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 2 ms 600 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 1928 KB Output is correct
2 Correct 46 ms 1880 KB Output is correct
3 Correct 36 ms 2392 KB Output is correct
4 Correct 11 ms 2136 KB Output is correct
5 Correct 17 ms 4776 KB Output is correct
6 Correct 15 ms 2192 KB Output is correct
7 Correct 14 ms 2168 KB Output is correct
8 Correct 15 ms 1872 KB Output is correct
9 Correct 11 ms 1880 KB Output is correct
10 Correct 11 ms 1876 KB Output is correct

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 600 KB Output is correct
2 Correct 16 ms 600 KB Output is correct
3 Correct 18 ms 600 KB Output is correct
4 Correct 25 ms 860 KB Output is correct
5 Correct 20 ms 856 KB Output is correct
6 Correct 2 ms 860 KB Output is correct
7 Correct 2 ms 860 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 2 ms 600 KB Output is correct
11 Correct 17 ms 1928 KB Output is correct
12 Correct 46 ms 1880 KB Output is correct
13 Correct 36 ms 2392 KB Output is correct
14 Correct 11 ms 2136 KB Output is correct
15 Correct 17 ms 4776 KB Output is correct
16 Correct 15 ms 2192 KB Output is correct
17 Correct 14 ms 2168 KB Output is correct
18 Correct 15 ms 1872 KB Output is correct
19 Correct 11 ms 1880 KB Output is correct
20 Correct 11 ms 1876 KB Output is correct
21 Correct 17 ms 2024 KB Output is correct
22 Correct 46 ms 2024 KB Output is correct
23 Correct 1193 ms 2708 KB Output is correct
24 Correct 424 ms 2524 KB Output is correct
25 Correct 38 ms 3264 KB Output is correct
26 Correct 38 ms 5300 KB Output is correct
27 Correct 15 ms 4792 KB Output is correct
28 Correct 18 ms 4600 KB Output is correct
29 Execution timed out 4026 ms 4804 KB Time limit exceeded
30 Halted 0 ms 0 KB -