Submission #1194494

#	Time	Username	Problem	Language	Result	Execution time	Memory
1194494		aykhn	Message (IOI24_message)	C++20	58.63 / 100	417 ms	868 KiB

message

#include "message.h"
#include <bits/stdc++.h>

using namespace std;

int o[31] = {28, 26, 6, 29, 17, 18, 13, 24, 4, 12, 5, 25, 21, 19, 16, 20, 8, 9, 14, 15, 2, 27, 11, 22, 23, 1, 7, 10, 30, 0, 3};

void send_message(vector<bool> M, vector<bool> C) 
{
  int n = M.size();
  vector<vector<bool>> res;
  vector<int> unlock;
  for (int i = 0; i < 31;)
  {
    vector<bool> v;
    if (unlock.empty())
    {
      if (C[o[i]] == 0) v = vector<bool>(31, 1);
      else v = vector<bool>(31, 0);
      send_packet(v);
      if (v.back()) unlock.push_back(o[i]);
      i++;
      continue;
    }
    v = vector<bool>(31, 0);
    int j = 0;
    while (i < 31 && j < unlock.size())
    {
      if (C[o[i]] == 0) v[unlock[j]] = 1, unlock.push_back(o[i]);
      else v[unlock[j]] = 0;
      i++, j++;
    }
    send_packet(v);
  }
  {
    vector<bool> v(31, 0);
    for (int i = 0; i <= 10; i++) v[unlock[i]] = (n >> i & 1);
    send_packet(v);
  }
  for (int i = 0; i < (n + 15) / 16; i++)
  {
    vector<bool> v(31, 0);
    for (int j = 0; j < 16; j++)
    {
      if (i * 16 + j >= n) break;
      v[unlock[j]] = M[i * 16 + j];
    }
    send_packet(v);
  }
}

vector<bool> receive_message(vector<vector<bool>> R) 
{
  vector<int> unlock;
  int cur = -1;
  auto nxt = [&]()
  {
    return R[++cur];
  };
  auto get = [&](vector<bool> A)
  {
    int cnt = 0;
    for (auto i : A) cnt += (int)i;
    return cnt >= 16;
  };
  for (int i = 0; i < 31;)
  {
    vector<bool> v = nxt();
    if (unlock.empty())
    {
      if (get(v)) unlock.push_back(o[i]);
      i++;
      continue;
    }
    int j = 0;
    while (i < 31 && j < unlock.size())
    {
      if (v[unlock[j]] == 1) unlock.push_back(o[i]);
      i++, j++;
    }
  }
  vector<bool> sz = nxt();
  int n = 0;
  for (int i = 0; i <= 10; i++) 
  {
    if (sz[unlock[i]]) n |= (1 << i);
  }
  vector<bool> res(n, 0);
  for (int i = 0; i < (n + 15) / 16; i++)
  {
    vector<bool> v = nxt();
    for (int j = 0; j < 16; j++)
    {
      if (i * 16 + j >= n) break;
      res[i * 16 + j] = v[unlock[j]];
    }
  }
  return res;
}

• Subtask 0: 0 / 0
• Subtask 1: 10 / 10
• Subtask 2: 48.6324 / 90