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답안 #956276

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
956276 2024-04-01T13:25:23 Z chrisvilches Dragon 2 (JOI17_dragon2) C++14
100 / 100
 2564 ms 3908 KB 
#include <bits/stdc++.h>
using namespace std;

vector<int> mid_it;

struct Point {
  int 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}; }
  long long cross(const Point& p) const {
    return x * (long long)p.y - y * (long long)p.x;
  }

  Point negate() const { return {-x, -y, idx}; }
};

short orientation(const Point& o, const Point& a, const Point& b) {
  const long long x = (a - o).cross(b - o);
  return (x > 0) - (x < 0);
}

Point A, B;

bool above(const Point& p) { return B.cross(p) > 0; }

Point to_upper(const Point& p) { return above(p) ? p : p.negate(); }
bool operator<(const Point& p, const Point& q) {
  return to_upper(p).cross(to_upper(q)) > 0;
}

bool cmp_by_b(const Point& p, const Point& q) {
  const bool a1 = above(p);
  const bool a2 = above(q);
  if (a1 != a2) return a1;
  return p.cross(q) > 0;
}

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

  int total = 0;
  int events[]{0, 0};
  int j = 0;

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

      if (p < q) break;

      events[above(q)]++;
      j++;
    }

    const auto mid = ord_b.begin() + mid_it[attacked_idx];

    if (above(p)) {
      const auto it = lower_bound(mid, ord_b.end(), B - p, cmp_by_b);

      const int count = it - mid;
      total += count - events[0];

      for (auto it = mid == ord_b.end() ? mid - 1 : mid;; it--) {
        const Point q = *it + B;
        total += above(q) && p.cross(q) < 0 && orientation(B, p, q) > 0;
        if (it == ord_b.begin()) break;
      }

    } else {
      const auto it = lower_bound(ord_b.begin(), mid, B - p, cmp_by_b);
      const int count = it - ord_b.begin();
      total += events[1] - count;

      for (auto it = mid; it != ord_b.end(); it++) {
        const Point q = *it + B;
        total += p.cross(q) > 0 && orientation(B, p, q) < 0;
      }
    }
  }

  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);
    vector<vector<Point>> order_by_b(M + 1);
    mid_it.resize(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);
    }

    cin >> A.x >> A.y;
    cin >> B.x >> B.y;
    cin >> Q;
    B = B - A;

    for (int m = 0; m <= M; m++) {
      auto& points = tribe_points[m];
      for (auto& p : points) p = p - A;
      for (auto& p : points) p = p - B;
      sort(points.begin(), points.end(), cmp_by_b);
      for (int i = 0; i < (int)points.size(); i++) points[i].idx = i;
      auto& b = order_by_b[m];
      b = points;
      mid_it[m] = lower_bound(b.begin(), b.end(), B.negate(), cmp_by_b) - b.begin();
      for (auto& p : points) p = p + B;
      sort(points.begin(), points.end());
    }

    while (Q--) {
      int i, j;
      cin >> i >> j;
      cout << query(tribe_points[i], tribe_points[j], order_by_b[j], j) << '\n';
    }
  }
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 13 ms 348 KB Output is correct
3 Correct 19 ms 348 KB Output is correct
4 Correct 31 ms 772 KB Output is correct
5 Correct 22 ms 904 KB Output is correct
6 Correct 2 ms 600 KB Output is correct
7 Correct 2 ms 856 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 4 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 351 ms 1288 KB Output is correct
2 Correct 603 ms 1276 KB Output is correct
3 Correct 26 ms 1284 KB Output is correct
4 Correct 11 ms 1372 KB Output is correct
5 Correct 12 ms 3280 KB Output is correct
6 Correct 597 ms 1492 KB Output is correct
7 Correct 430 ms 1280 KB Output is correct
8 Correct 14 ms 1244 KB Output is correct
9 Correct 344 ms 1276 KB Output is correct
10 Correct 9 ms 1212 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 13 ms 348 KB Output is correct
3 Correct 19 ms 348 KB Output is correct
4 Correct 31 ms 772 KB Output is correct
5 Correct 22 ms 904 KB Output is correct
6 Correct 2 ms 600 KB Output is correct
7 Correct 2 ms 856 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 4 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 351 ms 1288 KB Output is correct
12 Correct 603 ms 1276 KB Output is correct
13 Correct 26 ms 1284 KB Output is correct
14 Correct 11 ms 1372 KB Output is correct
15 Correct 12 ms 3280 KB Output is correct
16 Correct 597 ms 1492 KB Output is correct
17 Correct 430 ms 1280 KB Output is correct
18 Correct 14 ms 1244 KB Output is correct
19 Correct 344 ms 1276 KB Output is correct
20 Correct 9 ms 1212 KB Output is correct
21 Correct 345 ms 1244 KB Output is correct
22 Correct 596 ms 1276 KB Output is correct
23 Correct 728 ms 1728 KB Output is correct
24 Correct 381 ms 1744 KB Output is correct
25 Correct 44 ms 2128 KB Output is correct
26 Correct 35 ms 3416 KB Output is correct
27 Correct 14 ms 3676 KB Output is correct
28 Correct 14 ms 3908 KB Output is correct
29 Correct 2564 ms 3372 KB Output is correct
30 Correct 62 ms 3132 KB Output is correct
31 Correct 34 ms 3160 KB Output is correct
32 Correct 51 ms 3328 KB Output is correct
33 Correct 459 ms 3500 KB Output is correct
34 Correct 32 ms 3408 KB Output is correct
35 Correct 35 ms 3420 KB Output is correct
36 Correct 34 ms 3408 KB Output is correct
37 Correct 35 ms 3408 KB Output is correct
38 Correct 657 ms 3408 KB Output is correct
39 Correct 422 ms 3420 KB Output is correct
40 Correct 359 ms 3408 KB Output is correct
41 Correct 2029 ms 3576 KB Output is correct
42 Correct 1156 ms 3380 KB Output is correct
43 Correct 750 ms 3152 KB Output is correct
44 Correct 2015 ms 2532 KB Output is correct
45 Correct 1031 ms 2136 KB Output is correct
46 Correct 638 ms 2240 KB Output is correct
47 Correct 870 ms 2472 KB Output is correct
48 Correct 479 ms 2388 KB Output is correct
49 Correct 314 ms 2280 KB Output is correct