제출 #1041960

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1041960		vjudge1	열대 식물원 (Tropical Garden) (IOI11_garden)	C++17	49 / 100	331 ms	94292 KiB

garden

#include "garden.h"
#include "gardenlib.h"
#include <bits/stdc++.h>

using namespace std;

void count_routes(int N, int M, int P, int R[][2], int Q, int G[])
{
  vector<vector<int>> adj(N);
  for (int i = 0; i < M; ++i) {
    adj[R[i][0]].push_back(R[i][1]);
    adj[R[i][1]].push_back(R[i][0]);
  }

  set<pair<int,int>> nodes;

  for (int i = 0; i < N; ++i) {
    nodes.insert({-1, i});
    for (int v : adj[i]) nodes.insert({i, v});
  }

  map<pair<int,int>,int> idx;
  map<int,pair<int,int>> inv;
  int idx_ = 0;
  for (auto node : nodes) {
    idx[node] = idx_;
    inv[idx_] = node;
    ++idx_;
  }

  int siz = nodes.size();
  const int J = 30;
  vector<vector<int>> succ(siz, vector<int>(J+1, -1));
  for (int i = 0; i < N; ++i) {
    succ[idx[{-1, i}]][0] = idx[{i, adj[i][0]}];
    for (int v : adj[i]) {
      if (v != adj[i][0])
        succ[idx[{v, i}]][0] = idx[{i, adj[i][0]}];
      else
        succ[idx[{v, i}]][0] = idx[{i, adj[i][1]}];
    }
  }

  for (int j = 1; j <= J; ++j) {
    for (int u = 0; u < siz; ++u) {
      succ[u][j] = succ[ succ[u][j-1] ][j-1];
    }
  }

  for(int it = 0; it < Q; ++it) {
    int K = G[it];
    int cnt = 0;

    for (int i = 0; i < N; ++i) {
      int u = idx[{-1, i}];
      
      int k = K;
      for (int j = J; j >= 0; --j) {
        if (k & (1 << j)) {
          k -= 1 << j;
          u = succ[u][j];
        }
      }

      auto node = inv[u];
      if (node.second == P) ++cnt;
    }

    answer(cnt);
  }
}

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