oj.uz

답안 #956280

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
956280 2024-04-01T13:41:55 Z chrisvilches Dragon 2 (JOI17_dragon2) C++14
100 / 100
 2512 ms 3672 KB 
#include <bits/stdc++.h>
using namespace std;

struct Point {
  int x, y, 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;
vector<int> mid_it;

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 4 ms 348 KB Output is correct
2 Correct 11 ms 572 KB Output is correct
3 Correct 19 ms 348 KB Output is correct
4 Correct 32 ms 760 KB Output is correct
5 Correct 22 ms 860 KB Output is correct
6 Correct 2 ms 600 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 348 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 1 ms 344 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 352 ms 1292 KB Output is correct
2 Correct 607 ms 1276 KB Output is correct
3 Correct 27 ms 1368 KB Output is correct
4 Correct 11 ms 1296 KB Output is correct
5 Correct 12 ms 3164 KB Output is correct
6 Correct 604 ms 1064 KB Output is correct
7 Correct 443 ms 1276 KB Output is correct
8 Correct 15 ms 1244 KB Output is correct
9 Correct 364 ms 1240 KB Output is correct
10 Correct 9 ms 1208 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 348 KB Output is correct
2 Correct 11 ms 572 KB Output is correct
3 Correct 19 ms 348 KB Output is correct
4 Correct 32 ms 760 KB Output is correct
5 Correct 22 ms 860 KB Output is correct
6 Correct 2 ms 600 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 348 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 352 ms 1292 KB Output is correct
12 Correct 607 ms 1276 KB Output is correct
13 Correct 27 ms 1368 KB Output is correct
14 Correct 11 ms 1296 KB Output is correct
15 Correct 12 ms 3164 KB Output is correct
16 Correct 604 ms 1064 KB Output is correct
17 Correct 443 ms 1276 KB Output is correct
18 Correct 15 ms 1244 KB Output is correct
19 Correct 364 ms 1240 KB Output is correct
20 Correct 9 ms 1208 KB Output is correct
21 Correct 350 ms 1488 KB Output is correct
22 Correct 597 ms 1272 KB Output is correct
23 Correct 750 ms 1372 KB Output is correct
24 Correct 411 ms 1668 KB Output is correct
25 Correct 44 ms 2404 KB Output is correct
26 Correct 36 ms 3408 KB Output is correct
27 Correct 19 ms 3672 KB Output is correct
28 Correct 15 ms 3672 KB Output is correct
29 Correct 2512 ms 3480 KB Output is correct
30 Correct 59 ms 3168 KB Output is correct
31 Correct 35 ms 3160 KB Output is correct
32 Correct 52 ms 3408 KB Output is correct
33 Correct 450 ms 3444 KB Output is correct
34 Correct 41 ms 3412 KB Output is correct
35 Correct 33 ms 3420 KB Output is correct
36 Correct 34 ms 3360 KB Output is correct
37 Correct 37 ms 3408 KB Output is correct
38 Correct 686 ms 3412 KB Output is correct
39 Correct 436 ms 3408 KB Output is correct
40 Correct 356 ms 3496 KB Output is correct
41 Correct 2021 ms 3428 KB Output is correct
42 Correct 1115 ms 3668 KB Output is correct
43 Correct 740 ms 3412 KB Output is correct
44 Correct 1968 ms 2484 KB Output is correct
45 Correct 1040 ms 2352 KB Output is correct
46 Correct 646 ms 2288 KB Output is correct
47 Correct 905 ms 2268 KB Output is correct
48 Correct 488 ms 2240 KB Output is correct
49 Correct 327 ms 2540 KB Output is correct