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답안 #839317

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
839317 2023-08-29T16:35:03 Z asdfgrace 열대 식물원 (Tropical Garden) (IOI11_garden) C++17
100 / 100
 3544 ms 123448 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops,O3")
#pragma GCC target("avx,avx2")
#include "garden.h"
#include "gardenlib.h"
using namespace std;

void count_routes(int N, int M, int P, int R[][2], int Q, int G[]) {
  const int INF = (int) 1e9;
  vector<vector<int>> edges(N);
  for (int i = 0; i < M; ++i) {
    edges[R[i][0]].push_back(R[i][1]);
    edges[R[i][1]].push_back(R[i][0]);
  }
  vector<int> next(2 * N, -1);
  for (int i = 0; i < N; ++i) {
    int x = edges[i][0];
    next[2 * i] = (i == edges[x][0] ? 2 * x + 1 : 2 * x);
    x = ((int) edges[i].size() == 1 ? edges[i][0] : edges[i][1]);
    next[2 * i + 1] = (i == edges[x][0] ? 2 * x + 1 : 2 * x);
  }
  vector<vector<int>> pred(2 * N);
  for (int i = 0; i < 2 * N; ++i) {
    pred[next[i]].push_back(i);
  }
  vector<bool> visited(2 * N, false), active(2 * N, false);
  vector<int> st, cyc_sz(2 * N, 0), cyc_dist(2 * N, INF), elem(2 * N, -1),
    cyc_root(2 * N, -1), cyc_id(2 * N, -1);
  int cycles = -1, start = 0;
  function<void(int)> dfs = [&](int node) {
    if (active[node]) {
      ++cycles;
      int sz = (int) st.size();
      int bgn = 0;
      while (st[bgn] != node) {
        ++bgn;
      }
      sz -= bgn;
      for (int i = bgn; i < (int) st.size(); ++i) {
        cyc_id[st[i]] = i - bgn;
        cyc_sz[st[i]] = sz;
        cyc_dist[st[i]] = 0;
        cyc_root[st[i]] = st[i];
        elem[st[i]] = cycles;
      }
    }
    if (visited[node]) {
      return;
    }
    visited[node] = true;
    active[node] = true;
    st.push_back(node);
    dfs(next[node]);
    active[node] = false;
    st.pop_back();
  };
  vector<vector<bool>> anc(Q, vector<bool>(2 * N, false));
  bool p2 = false, p2_1 = false;
  function<void(int, int)> tree_dfs = [&](int node, int root) -> void {
    if (node == 2 * P) {
      p2 = true;
    }
    if (node == 2 * P + 1) {
      p2_1 = true;
    }
    if (p2) {
      int p_dist = cyc_dist[node] - cyc_dist[2 * P];
      for (int i = 0; i < Q; ++i) {
        if (G[i] == p_dist) {
          anc[i][node] = true;
        }
      }
    }
    if (p2_1) {
      int p_dist = cyc_dist[node] - cyc_dist[2 * P + 1];
      for (int i = 0; i < Q; ++i) {
        if (G[i] == p_dist) {
          anc[i][node] = true;
        }
      }
    }
    for (auto x : pred[node]) {
      cyc_dist[x] = cyc_dist[node] + 1;
      elem[x] = elem[root];
      cyc_root[x] = cyc_root[node];
      tree_dfs(x, root);
    }
    if (node == 2 * P) {
      p2 = false;
    }
    if (node == 2 * P + 1) {
      p2_1 = false;
    }
  };
  for (start = 0; start < 2 * N; start += 2) {
    if (!visited[start]) {
      dfs(start);
    }
  }
  for (int i = 0; i < 2 * N; ++i) {
    if (cyc_dist[i] == INF && cyc_dist[next[i]] == 0) {
      cyc_dist[i] = 1;
      cyc_root[i] = next[i];
      elem[i] = elem[next[i]];
      tree_dfs(i, i);
    }
  }
  for (int j = 0; j < Q; ++j) {
    int k = G[j], cnt = 0;
    for (int i = 0; i < N; ++i) {
      if (anc[j][2 * i]) {
        ++cnt;
      }
      for (int p = 2 * P; p <= 2 * P + 1; ++p) {
        int node = 2 * i, dist = 0;
        if (elem[node] != elem[p]) continue;
        if (cyc_dist[p] != 0) {
          continue;
        } else if (cyc_dist[node] != 0) {
          dist += cyc_dist[node];
          node = cyc_root[node];
        }
        dist += (cyc_id[p] >= cyc_id[node] ? cyc_id[p] - cyc_id[node]
          : cyc_sz[node] - cyc_id[node] + cyc_id[p]);
        if (k >= dist && dist % cyc_sz[node] == k % cyc_sz[node]) {
          ++cnt;
        } 
      }
    }
    answer(cnt);
  }
}

Subtask #1
49.0 / 49.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 2 ms 704 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 2 ms 704 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 10 ms 5460 KB Output is correct
12 Correct 22 ms 8916 KB Output is correct
13 Correct 41 ms 36800 KB Output is correct
14 Correct 100 ms 27980 KB Output is correct
15 Correct 94 ms 28488 KB Output is correct
16 Correct 91 ms 20556 KB Output is correct
17 Correct 85 ms 17612 KB Output is correct
18 Correct 28 ms 8396 KB Output is correct
19 Correct 84 ms 28012 KB Output is correct
20 Correct 110 ms 28484 KB Output is correct
21 Correct 67 ms 20372 KB Output is correct
22 Correct 55 ms 17580 KB Output is correct
23 Correct 100 ms 31264 KB Output is correct

Subtask #3
31.0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 2 ms 704 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 10 ms 5460 KB Output is correct
12 Correct 22 ms 8916 KB Output is correct
13 Correct 41 ms 36800 KB Output is correct
14 Correct 100 ms 27980 KB Output is correct
15 Correct 94 ms 28488 KB Output is correct
16 Correct 91 ms 20556 KB Output is correct
17 Correct 85 ms 17612 KB Output is correct
18 Correct 28 ms 8396 KB Output is correct
19 Correct 84 ms 28012 KB Output is correct
20 Correct 110 ms 28484 KB Output is correct
21 Correct 67 ms 20372 KB Output is correct
22 Correct 55 ms 17580 KB Output is correct
23 Correct 100 ms 31264 KB Output is correct
24 Correct 2 ms 468 KB Output is correct
25 Correct 101 ms 16724 KB Output is correct
26 Correct 145 ms 27380 KB Output is correct
27 Correct 3544 ms 78648 KB Output is correct
28 Correct 997 ms 94176 KB Output is correct
29 Correct 3432 ms 95396 KB Output is correct
30 Correct 2102 ms 65484 KB Output is correct
31 Correct 1943 ms 55232 KB Output is correct
32 Correct 351 ms 26912 KB Output is correct
33 Correct 998 ms 94172 KB Output is correct
34 Correct 3483 ms 95380 KB Output is correct
35 Correct 2216 ms 65244 KB Output is correct
36 Correct 1999 ms 55212 KB Output is correct
37 Correct 848 ms 104892 KB Output is correct
38 Correct 3129 ms 123448 KB Output is correct