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답안 #956279

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
956279 2024-04-01T13:39:53 Z chrisvilches Dragon 2 (JOI17_dragon2) C++14
60 / 100
 4000 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;

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;
}

const int bit_n = 30'001;
short bit[bit_n];

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

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

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

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

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

  clear(points2.size());

  int total = 0;
  int j = 0;

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

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

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

      j++;
    }

    Point from = p - B;
    Point to = B - p;

    if (!above(p)) swap(from, to);

    const int a = lower_bound(ord_b.begin(), ord_b.end(), from, cmp_by_b) - ord_b.begin();
    const int b = lower_bound(ord_b.begin(), ord_b.end(), to, cmp_by_b) - ord_b.begin();

    total += sum(a, b - 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);
    vector<vector<Point>> order_by_b(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;
      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]) << '\n';
    }
  }
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 348 KB Output is correct
2 Correct 4 ms 348 KB Output is correct
3 Correct 22 ms 584 KB Output is correct
4 Correct 43 ms 756 KB Output is correct
5 Correct 24 ms 860 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 348 KB Output is correct
9 Correct 1 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 18 ms 1172 KB Output is correct
2 Correct 45 ms 1116 KB Output is correct
3 Correct 17 ms 1372 KB Output is correct
4 Correct 11 ms 1368 KB Output is correct
5 Correct 12 ms 3164 KB Output is correct
6 Correct 13 ms 1264 KB Output is correct
7 Correct 13 ms 1244 KB Output is correct
8 Correct 15 ms 1244 KB Output is correct
9 Correct 10 ms 1244 KB Output is correct
10 Correct 10 ms 1212 KB Output is correct

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 348 KB Output is correct
2 Correct 4 ms 348 KB Output is correct
3 Correct 22 ms 584 KB Output is correct
4 Correct 43 ms 756 KB Output is correct
5 Correct 24 ms 860 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 18 ms 1172 KB Output is correct
12 Correct 45 ms 1116 KB Output is correct
13 Correct 17 ms 1372 KB Output is correct
14 Correct 11 ms 1368 KB Output is correct
15 Correct 12 ms 3164 KB Output is correct
16 Correct 13 ms 1264 KB Output is correct
17 Correct 13 ms 1244 KB Output is correct
18 Correct 15 ms 1244 KB Output is correct
19 Correct 10 ms 1244 KB Output is correct
20 Correct 10 ms 1212 KB Output is correct
21 Correct 17 ms 1244 KB Output is correct
22 Correct 45 ms 1320 KB Output is correct
23 Correct 302 ms 1512 KB Output is correct
24 Correct 453 ms 1776 KB Output is correct
25 Correct 57 ms 2132 KB Output is correct
26 Correct 38 ms 3160 KB Output is correct
27 Correct 14 ms 3672 KB Output is correct
28 Correct 14 ms 3664 KB Output is correct
29 Execution timed out 4054 ms 3400 KB Time limit exceeded
30 Halted 0 ms 0 KB -