Submission #628935

#	Time	Username	Problem	Language	Result	Execution time	Memory
628935		flashmt	Rarest Insects (IOI22_insects)	C++17	57.14 / 100	163 ms	464 KiB

insects

#include <bits/stdc++.h>
#include "insects.h"
using namespace std;
 
vector<int> findFirstOccurrences(int n, int maxC)
{
  vector<int> res;
  for (int i = 0; i < n; i++)
  {
    move_inside(i);
    if (press_button() > maxC) move_outside(i);
    else res.push_back(i);
  }
  for (int i : res)
    move_outside(i);
  return res;
}
 
int min_cardinality(int n)
{
  auto occurrences = findFirstOccurrences(n, 1);
  int typeCnt = size(occurrences);
 
  if (typeCnt <= 7)
  {
    vector<int> cnt(n);
    for (int i = 0; i < n; i++)
    {
      move_inside(i);
      for (int j : occurrences)
      {
        move_inside(j);
        if (press_button() == 2)
        {
          cnt[j]++;
          move_outside(j);
          break;
        }
        move_outside(j);
      }
      move_outside(i);
    }
 
    int ans = n;
    for (int x : occurrences)
      ans = min(ans, cnt[x] + 1);
    return ans;
  }
 
  int low = 2, high = n / typeCnt, ans = 1;
  while (low <= high)
  {
    int mid = (low + high) / 2;
    auto occ = findFirstOccurrences(n, mid);
    if (size(occ) == typeCnt * mid)
    {
      ans = mid;
      low = mid + 1;
    }
    else high = mid - 1;
  }
  return ans;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:55:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   55 |     if (size(occ) == typeCnt * mid)
      |         ~~~~~~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 32.14 / 75