Submission #629763

#	Time	Username	Problem	Language	Result	Execution time	Memory
629763		hltk	Rarest Insects (IOI22_insects)	C++17	54.96 / 100	195 ms	424 KiB

insects

#include "insects.h"

#include <vector>
#include <numeric>

using namespace std;

int min_cardinality(int n) {
  int inside = 0;
  vector<int> avail(n), navail, used;
  iota(avail.begin(), avail.end(), 0);
  int types = 0;
  for (int i : avail) {
    inside++;
    move_inside(i);
    if (press_button() == 1) {
      types++;
      used.push_back(i);
    } else {
      navail.push_back(i);
      move_outside(i);
      inside--;
    }
  }
  swap(avail, navail);
  navail.clear();
  if (types == 1 || types == n) {
    return 1 ^ n ^ types;
  }
  int l = 1, r = n - 1;
  while (l < r) {
    int m = (l + r) / 2;
    int k = m + 1;
    vector<int> vin, vout;
    for (int i : avail) {
      move_inside(i);
      inside++;
      if (press_button() > k) {
        move_outside(i);
        inside--;
        vout.push_back(i);
      } else {
        vin.push_back(i);
      }
    }
    if (inside < k * types) {
      for (int u : vin) {
        move_outside(u);
        inside--;
      }
      avail = vin;
      r = m;
    } else {
      avail = vout;
      l = m + 1;
    }
  }
  return l;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 29.96 / 75