제출 #839172

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
839172		asdfgrace	열대 식물원 (Tropical Garden) (IOI11_garden)	C++17	0 / 100	1 ms	596 KiB

garden

#include <bits/stdc++.h>
#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 LOG = 31, 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;
  function<void(int)> dfs = [&](int node) {
    if (active[node]) {
      ++cycles;
      for (int i = 0; i < (int) st.size(); ++i) {
        cyc_id[st[i]] = i;
        cyc_sz[st[i]] = (int) st.size();
        cyc_dist[st[i]] = 0;
        cyc_root[st[i]] = st[i];
        elem[st[i]] = cycles;
      }
      return;
    }
    visited[node] = true;
    active[node] = true;
    st.push_back(node);
    for (auto x : pred[node]) {
      dfs(x);
    }
    active[node] = false;
    st.pop_back();
  };
  function<void(int, int)> tree_dfs = [&](int node, int root) -> void {
    for (auto x : pred[node]) {
      if (cyc_dist[x] == 0) continue;
      cyc_dist[x] = cyc_dist[node] + 1;
      cyc_root[x] = root;
      elem[x] = elem[root];
      tree_dfs(x, root);
    }
  };
  for (int i = 0; i < N; ++i) {
    if (!visited[2 * i]) {
      dfs(2 * i);
    }
  }
  for (int i = 0; i < 2 * N; ++i) {
    if (cyc_dist[i] == 0) {
      tree_dfs(i, i);
    }
  }
  for (int j = 0; j < Q; ++j) {
    int k = G[j], cnt = 0;
    for (int i = 0; i < N; ++i) {
      int node = 2 * i;
      if (elem[node] != elem[2 * P]) continue;
      int dist = 0;
      if (cyc_dist[node] != 0) {
        dist += cyc_dist[node];
        node = cyc_root[node];
      }
      for (int p = 2 * P; p <= 2 * P + 1; ++p) {
        int pos1 = cyc_id[p], pos2 = cyc_id[node];
        int d = dist + (pos1 > pos2 ? pos1 - pos2 : cyc_sz[node] - pos2 + pos1);
        if (d >= k && d % cyc_sz[node] == k % cyc_sz[node]) ++cnt;
      }
    }
    answer(cnt);
  }
}

컴파일 시 표준 에러 (stderr) 메시지

garden.cpp: In function 'void count_routes(int, int, int, int (*)[2], int, int*)':
garden.cpp:7:13: warning: unused variable 'LOG' [-Wunused-variable]
    7 |   const int LOG = 31, INF = (int) 1e9;
      |             ^~~

• Subtask 1: 0 / 49
• Subtask 2: 0 / 20
• Subtask 3: 0 / 31