Submission #1032230

#	Time	Username	Problem	Language	Result	Execution time	Memory
1032230		NeroZein	Chameleon's Love (JOI20_chameleon)	C++17	44 / 100	48 ms	524 KiB

chameleon

#include "chameleon.h"
#include <bits/stdc++.h>
using namespace std;  

bool bad(vector<int> ask, int v) {
  ask.push_back(v);
  return Query(ask) != (int) ask.size();
}

void Solve(int N) {
  vector<bool> vis(N * 2 + 1);
  vector<vector<int>> g(N * 2 + 1);
  function<void(int, int, vector<vector<int>>&)> dfs = [&](int v, int parity, vector<vector<int>>& p) {
    if (vis[v] == true) {
      return;
    }
    vis[v] = true;
    p[parity].push_back(v);
    for (int u : g[v]) {
      dfs(u, parity ^ 1, p);
    }
  };
  for (int i = 2; i <= 2 * N; ++i) {
    vector<vector<int>> p(2);
    for (int j = 1; j < i; ++j) {
      vis[j] = false; 
    }
    for (int j = 1; j < i; ++j) {
      if (!vis[j]) {
        dfs(j, 0, p);
      }
    }
    //cerr << "V: " << i << ' ' << p[0].size() << ' ' << p[1].size() << '\n';
    for (int rep = 0; rep < 2; ++rep) {
      while (true) {
        int m = (int) p[rep].size();
        int l = -1, r = m - 1;
        while (l < r) {
          int mid = (l + r + 1) >> 1;
          vector<int> ask;
          for (int j = 0; j <= mid; ++j) {
            ask.push_back(p[rep][j]);
          }
          if (bad(ask, i)) {
            r = mid - 1; 
          } else {
            l = mid;
          }
        }
        if (r == m - 1) {
          break; 
        }
        //cerr << "u, v: " << i << ' ' << p[rep][l + 1] << '\n'; 
        g[p[rep][l + 1]].push_back(i);
        g[i].push_back(p[rep][l + 1]);
        vector<int> np;
        for (int j = l + 2; j < m; ++j) {
          np.push_back(p[rep][j]);
        }
        swap(p[rep], np); 
      }
    }
  }
  vector<bool> f(2 * N + 1);
  vector<int> love(2 * N + 1);
  for (int v = 1; v <= 2 * N; ++v) {
    if (g[v].size() == 1) {
      if (!f[v]) {
        Answer(v, g[v][0]);        
      }
      f[v] = true;
      f[g[v][0]] = true; 
      continue; 
    }
    assert(g[v].size() == 3);
    int x = g[v][0] ^ g[v][1] ^ g[v][2];
    for (int i = 0; i < 3 && !love[v]; ++i) {
      for (int j = i + 1; j < 3; ++j) {
        int u = g[v][i], w = g[v][j];
        int k = Query({u, v, w});
        if (k == 1) {
          love[v] = x ^ u ^ w;
          break; 
        }
      }
    }
  }
  for (int v = 1; v <= N * 2; ++v) {
    if (f[v]) {
      continue; 
    }
    for (int u : g[v]) {
      if (u != love[v] && love[u] != v) {
        f[u] = true;
        f[v] = true; 
        Answer(u, v);
        break; 
      }
    }
  }
}

• Subtask 1: 4 / 4
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36