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답안 #955944

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
955944 2024-03-31T17:51:02 Z chrisvilches Dragon 2 (JOI17_dragon2) C++14
100 / 100
 1869 ms 5056 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));
}

short bit[30'001];

void clear(const int n) { memset(bit, 0, sizeof(short) * n); }

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

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

void add(int idx, const short delta) {
  for (; idx < 30'001; idx = idx | (idx + 1)) bit[idx] += delta;
}

unordered_map<int, vector<Point>> order_by_b;

bool cmp_by_b(const Point& p, const Point& q) {
  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;

  clear(points2.size());

  for (const auto& q : points2) {
    if (!q.above()) {
      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;
      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 - B, cmp_by_b);
    const auto it2 = lower_bound(ord_b.begin(), ord_b.end(), to_point - B, cmp_by_b);

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

    total += 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;
    }

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

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

      for (auto& p : tribe_points.at(m)) p = p - B;
      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& p : tribe_points.at(m)) p = p + B;
    }

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

    // 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 (false && (tribe_points[i].size() > 14900 || tribe_points[j].size() > 14900)) {
        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 7 ms 604 KB Output is correct
2 Correct 13 ms 668 KB Output is correct
3 Correct 24 ms 604 KB Output is correct
4 Correct 24 ms 852 KB Output is correct
5 Correct 21 ms 860 KB Output is correct
6 Correct 2 ms 860 KB Output is correct
7 Correct 2 ms 860 KB Output is correct
8 Correct 7 ms 604 KB Output is correct
9 Correct 6 ms 624 KB Output is correct
10 Correct 7 ms 604 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 589 ms 2108 KB Output is correct
2 Correct 1082 ms 2132 KB Output is correct
3 Correct 33 ms 2396 KB Output is correct
4 Correct 11 ms 2336 KB Output is correct
5 Correct 13 ms 4560 KB Output is correct
6 Correct 476 ms 2188 KB Output is correct
7 Correct 435 ms 2412 KB Output is correct
8 Correct 634 ms 1876 KB Output is correct
9 Correct 522 ms 1988 KB Output is correct
10 Correct 624 ms 1988 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 604 KB Output is correct
2 Correct 13 ms 668 KB Output is correct
3 Correct 24 ms 604 KB Output is correct
4 Correct 24 ms 852 KB Output is correct
5 Correct 21 ms 860 KB Output is correct
6 Correct 2 ms 860 KB Output is correct
7 Correct 2 ms 860 KB Output is correct
8 Correct 7 ms 604 KB Output is correct
9 Correct 6 ms 624 KB Output is correct
10 Correct 7 ms 604 KB Output is correct
11 Correct 589 ms 2108 KB Output is correct
12 Correct 1082 ms 2132 KB Output is correct
13 Correct 33 ms 2396 KB Output is correct
14 Correct 11 ms 2336 KB Output is correct
15 Correct 13 ms 4560 KB Output is correct
16 Correct 476 ms 2188 KB Output is correct
17 Correct 435 ms 2412 KB Output is correct
18 Correct 634 ms 1876 KB Output is correct
19 Correct 522 ms 1988 KB Output is correct
20 Correct 624 ms 1988 KB Output is correct
21 Correct 572 ms 1876 KB Output is correct
22 Correct 1114 ms 2128 KB Output is correct
23 Correct 1134 ms 2752 KB Output is correct
24 Correct 408 ms 2640 KB Output is correct
25 Correct 37 ms 3172 KB Output is correct
26 Correct 34 ms 4788 KB Output is correct
27 Correct 15 ms 4616 KB Output is correct
28 Correct 14 ms 4792 KB Output is correct
29 Correct 1869 ms 4896 KB Output is correct
30 Correct 48 ms 4636 KB Output is correct
31 Correct 36 ms 4504 KB Output is correct
32 Correct 47 ms 4792 KB Output is correct
33 Correct 394 ms 4800 KB Output is correct
34 Correct 37 ms 4788 KB Output is correct
35 Correct 33 ms 4792 KB Output is correct
36 Correct 34 ms 4792 KB Output is correct
37 Correct 34 ms 4908 KB Output is correct
38 Correct 640 ms 5040 KB Output is correct
39 Correct 541 ms 4784 KB Output is correct
40 Correct 417 ms 5056 KB Output is correct
41 Correct 1493 ms 4828 KB Output is correct
42 Correct 982 ms 4796 KB Output is correct
43 Correct 830 ms 4756 KB Output is correct
44 Correct 1049 ms 3380 KB Output is correct
45 Correct 523 ms 3416 KB Output is correct
46 Correct 299 ms 3364 KB Output is correct
47 Correct 688 ms 3468 KB Output is correct
48 Correct 541 ms 3340 KB Output is correct
49 Correct 262 ms 3500 KB Output is correct