Submission #806653

#	Time	Username	Problem	Language	Result	Execution time	Memory
806653		Ronin13	Rarest Insects (IOI22_insects)	C++17	99.78 / 100	55 ms	416 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>
#define ll long long 
#define ull unsigned ll
#define f first
#define s second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pb push_back
#define epb emplace_back 
using namespace std;

int d;

int min_cardinality(int n) {
  vector <int> act;
  bool used[n + 1];
  fill(used, used + n + 1, false);
  for(int i = 0; i < n; i++){
    move_inside(i);
    int x = press_button();
    if(x == 2) move_outside(i);
    else act.pb(i);
  }
  //for(int to : act) cout << to << ' ';
  //int l = 0, r = act.size();
  for(int to : act) move_outside(to);
  int d = act.size();
  int l = 1, r = n / d + 1;
  vector <int> cur;
  while(l + 1 < r){
    int mid = (l + r) / 2;
    vector <int> vv;
    for(int i = 0; i < n; i++){
      if(used[i]) continue;
      move_inside(i);
      int x = press_button();
      if(x > mid) move_outside(i);
      else vv.pb(i);
    }
    int x = cur.size() + vv.size();
    if(x == mid * d){
      l = mid;
      for(int to : vv) used[to] = true, cur.pb(to);
    }
    else{
      r = mid;
      for(int i = 0; i < n; i++) used[i] =true;
      for(int to : vv) used[to] = false, move_outside(to);
    }
  }
  return l;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 74.78 / 75