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답안 #283874

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
283874 2020-08-26T08:34:54 Z rama_pang Golf (JOI17_golf) C++14
100 / 100
 6773 ms 426312 KB 
#include <bits/stdc++.h>
using namespace std;

class SegmentTree {
 public:
  int sz;
  vector<set<pair<int, int>>> tree;

  SegmentTree() {}
  SegmentTree(int sz) : sz(sz), tree(2 * sz) {}

  void Add(int l, int r, int v, int id = -1) {
    for (l += sz, r += sz + 1; l < r; l /= 2, r /= 2) {
      if (l & 1) tree[l++].emplace(v, id);
      if (r & 1) tree[--r].emplace(v, id);
    }
  }

  int FindMax(int p, int x) { // Find maximum <= x
    int res = 0;
    for (p += sz; p > 0; p /= 2) {
      if (!tree[p].empty()) {
        auto it = tree[p].upper_bound({x, sz + 1});
        if (it != begin(tree[p])) {
          res = max(res, prev(it)->first);
        }
      }
    }
    return res;
  }

  int FindMin(int p, int x) { // Find minimum >= x
    int res = sz - 1;
    for (p += sz; p > 0; p /= 2) {
      if (!tree[p].empty()) {
        auto it = tree[p].lower_bound({x, -1});
        if (it != end(tree[p])) {
          res = min(res, it->first);
        }        
      }
    }
    return res;
  }

  vector<int> FindIntersection(int p, int x, int y) {
    vector<int> res;
    for (p += sz; p > 0; p /= 2) {
      if (tree[p].empty()) {
        continue;
      }
      auto &s = tree[p];
      auto it = s.lower_bound({x, -1});
      while (it != end(s) && it->first <= y) {
        res.emplace_back(it->second);
        it = s.erase(it);
      }
    }
    sort(begin(res), end(res));
    res.resize(unique(begin(res), end(res)) - begin(res));
    return res;
  }
};

void Read(int &S, int &T, int &U, int &V, int &N, 
          vector<int> &A, vector<int> &B, vector<int> &C, vector<int> &D) {

  cin >> S >> T >> U >> V >> N;
  A.resize(N), B.resize(N), C.resize(N), D.resize(N);

  vector<int> xcoord = {S, U};
  vector<int> ycoord = {T, V};
  for (int i = 0; i < N; i++) {
    cin >> A[i] >> B[i] >> C[i] >> D[i];
    xcoord.emplace_back(A[i]);
    xcoord.emplace_back(B[i]);
    ycoord.emplace_back(C[i]);
    ycoord.emplace_back(D[i]);
  }

  sort(begin(xcoord), end(xcoord));
  sort(begin(ycoord), end(ycoord));
  xcoord.resize(unique(begin(xcoord), end(xcoord)) - begin(xcoord));
  ycoord.resize(unique(begin(ycoord), end(ycoord)) - begin(ycoord));

  const auto GetPosition = [&](const vector<int> &a, int x) {
    return lower_bound(begin(a), end(a), x) - begin(a);
  };

  S = GetPosition(xcoord, S);
  T = GetPosition(ycoord, T);
  U = GetPosition(xcoord, U);
  V = GetPosition(ycoord, V);

  for (int i = 0; i < N; i++) {
    A[i] = GetPosition(xcoord, A[i]);
    B[i] = GetPosition(xcoord, B[i]);
    C[i] = GetPosition(ycoord, C[i]);
    D[i] = GetPosition(ycoord, D[i]);
  }
}

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);

  int S, T, U, V, N;
  vector<int> A, B, C, D;
  Read(S, T, U, V, N, A, B, C, D);

  vector<SegmentTree> boundary(2, SegmentTree(2 * N + 2));
  for (int i = 0; i < N; i++) {
    boundary[0].Add(C[i] + 1, D[i] - 1, A[i]);
    boundary[0].Add(C[i] + 1, D[i] - 1, B[i]);
    boundary[1].Add(A[i] + 1, B[i] - 1, C[i]);
    boundary[1].Add(A[i] + 1, B[i] - 1, D[i]);
  }

  vector<array<int, 4>> lines;
  for (int i = 0; i < N; i++) {
    lines.push_back({A[i], C[i], D[i], 0});
    lines.push_back({B[i], C[i], D[i], 0});
    lines.push_back({C[i], A[i], B[i], 1});
    lines.push_back({D[i], A[i], B[i], 1});
  }

  lines.push_back({S, T, T, 0});
  lines.push_back({T, S, S, 1});
  lines.push_back({U, V, V, 0});
  lines.push_back({V, U, U, 1});

  for (auto &l : lines) {
    l[1] = boundary[l[3] ^ 1].FindMax(l[0], l[1] - 1);
    l[2] = boundary[l[3] ^ 1].FindMin(l[0], l[2] + 1);
  }

  vector<SegmentTree> intersect(2, SegmentTree(2 * N + 2));
  for (int i = 0; i < (int) lines.size(); i++) {
    intersect[lines[i][3]].Add(lines[i][1], lines[i][2], lines[i][0], i);
  }

  queue<int> q;
  vector<int> dist(4 * N + 4, -1);
  for (int i = 0; i < (int) lines.size(); i++) {
    if (lines[i][3] == 0) { // vertical
      if (lines[i][0] == S && lines[i][1] <= T && T <= lines[i][2]) {
        q.emplace(i);
        dist[i] = 1;
      }
    } else { // horizontal
      if (lines[i][0] == T && lines[i][1] <= S && S <= lines[i][2]) {
        q.emplace(i);
        dist[i] = 1;
      }
    }
  }

  while (!q.empty()) {
    int u = q.front();
    q.pop();
    auto l = lines[u];
    auto adj = intersect[l[3] ^ 1].FindIntersection(l[0], l[1], l[2]);
    for (auto v : adj) {
      if (dist[v] == -1) {
        dist[v] = dist[u] + 1;
        q.emplace(v);
      }
    }
  }

  int ans = 1e9;
  for (int i = 0; i < (int) lines.size(); i++) {
    if (lines[i][3] == 0) { // vertical
      if (lines[i][0] == U && lines[i][1] <= V && V <= lines[i][2]) {
        ans = min(ans, dist[i]);
      }
    } else { // horizontal
      if (lines[i][0] == V && lines[i][1] <= U && U <= lines[i][2]) {
        ans = min(ans, dist[i]);
      }
    }
  }

  cout << ans << "\n";
  return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 512 KB Output is correct
5 Correct 13 ms 2760 KB Output is correct
6 Correct 13 ms 2756 KB Output is correct
7 Correct 12 ms 2760 KB Output is correct
8 Correct 13 ms 2884 KB Output is correct
9 Correct 14 ms 2884 KB Output is correct
10 Correct 13 ms 2884 KB Output is correct
11 Correct 13 ms 2884 KB Output is correct
12 Correct 16 ms 2756 KB Output is correct
13 Correct 13 ms 2756 KB Output is correct
14 Correct 13 ms 2884 KB Output is correct
15 Correct 5 ms 1536 KB Output is correct
16 Correct 13 ms 2920 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 512 KB Output is correct
5 Correct 13 ms 2760 KB Output is correct
6 Correct 13 ms 2756 KB Output is correct
7 Correct 12 ms 2760 KB Output is correct
8 Correct 13 ms 2884 KB Output is correct
9 Correct 14 ms 2884 KB Output is correct
10 Correct 13 ms 2884 KB Output is correct
11 Correct 13 ms 2884 KB Output is correct
12 Correct 16 ms 2756 KB Output is correct
13 Correct 13 ms 2756 KB Output is correct
14 Correct 13 ms 2884 KB Output is correct
15 Correct 5 ms 1536 KB Output is correct
16 Correct 13 ms 2920 KB Output is correct
17 Correct 16 ms 3272 KB Output is correct
18 Correct 19 ms 3176 KB Output is correct
19 Correct 15 ms 3268 KB Output is correct
20 Correct 15 ms 3268 KB Output is correct
21 Correct 18 ms 3268 KB Output is correct
22 Correct 16 ms 3396 KB Output is correct
23 Correct 15 ms 3268 KB Output is correct
24 Correct 15 ms 3268 KB Output is correct
25 Correct 15 ms 3268 KB Output is correct
26 Correct 15 ms 3268 KB Output is correct
27 Correct 5 ms 1792 KB Output is correct
28 Correct 11 ms 3160 KB Output is correct
29 Correct 11 ms 3160 KB Output is correct

Subtask #3
70.0 / 70.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 512 KB Output is correct
5 Correct 13 ms 2760 KB Output is correct
6 Correct 13 ms 2756 KB Output is correct
7 Correct 12 ms 2760 KB Output is correct
8 Correct 13 ms 2884 KB Output is correct
9 Correct 14 ms 2884 KB Output is correct
10 Correct 13 ms 2884 KB Output is correct
11 Correct 13 ms 2884 KB Output is correct
12 Correct 16 ms 2756 KB Output is correct
13 Correct 13 ms 2756 KB Output is correct
14 Correct 13 ms 2884 KB Output is correct
15 Correct 5 ms 1536 KB Output is correct
16 Correct 13 ms 2920 KB Output is correct
17 Correct 16 ms 3272 KB Output is correct
18 Correct 19 ms 3176 KB Output is correct
19 Correct 15 ms 3268 KB Output is correct
20 Correct 15 ms 3268 KB Output is correct
21 Correct 18 ms 3268 KB Output is correct
22 Correct 16 ms 3396 KB Output is correct
23 Correct 15 ms 3268 KB Output is correct
24 Correct 15 ms 3268 KB Output is correct
25 Correct 15 ms 3268 KB Output is correct
26 Correct 15 ms 3268 KB Output is correct
27 Correct 5 ms 1792 KB Output is correct
28 Correct 11 ms 3160 KB Output is correct
29 Correct 11 ms 3160 KB Output is correct
30 Correct 5815 ms 413968 KB Output is correct
31 Correct 6003 ms 417272 KB Output is correct
32 Correct 6483 ms 421208 KB Output is correct
33 Correct 6103 ms 421576 KB Output is correct
34 Correct 5887 ms 426312 KB Output is correct
35 Correct 6371 ms 425820 KB Output is correct
36 Correct 6773 ms 425428 KB Output is correct
37 Correct 6283 ms 424836 KB Output is correct
38 Correct 6173 ms 425904 KB Output is correct
39 Correct 6233 ms 425012 KB Output is correct
40 Correct 4345 ms 405180 KB Output is correct
41 Correct 4428 ms 404904 KB Output is correct
42 Correct 4470 ms 409100 KB Output is correct
43 Correct 4483 ms 409116 KB Output is correct
44 Correct 4490 ms 413260 KB Output is correct
45 Correct 4550 ms 413244 KB Output is correct
46 Correct 4484 ms 413232 KB Output is correct
47 Correct 4508 ms 413024 KB Output is correct
48 Correct 4366 ms 413024 KB Output is correct
49 Correct 4419 ms 413204 KB Output is correct
50 Correct 11 ms 3164 KB Output is correct
51 Correct 11 ms 3160 KB Output is correct
52 Correct 11 ms 3160 KB Output is correct