Submission #1215225

#	Time	Username	Problem	Language	Result	Execution time	Memory
1215225		dosts	Rarest Insects (IOI22_insects)	C++20	0 / 100	4 ms	8232 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
//#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define sp << " " <<
#define all(x) x.begin(),x.end()
#define big(x) ((int)(x.size()))
using namespace std;
const int MOD = 1e9+7, LIM = 1e6+1, inf = 2e9;

vi inside(LIM,0);
int total = 0;
void add(int p) {
  if (inside[p]) return;
  inside[p] = 1;
  total++;
  move_inside(p);
}
void remove(int p) {
  if (!inside[p]) return;
  inside[p] = 0;
  total--;
  move_outside(p);
}

int D = 0;

vi placed;
vi skip(LIM,0);
bool check(int N,int x) {
  placed.clear();
  assert(total <= D*x);
  for (int i = 0;i<N;i++) {
    if (inside[i] || skip[i]) continue;
    placed.push_back(i);
    add(i);
    int y = press_button();
    if (y > x) {
      placed.pop_back();
      remove(i);
    }
    if (total == D*x) return true;
  }
  return false;
}

int min_cardinality(int N) {
  for (int i = 0;i<N;i++) {
    add(i);
    int y = press_button();
    if (y == 1) {
      D++;
      continue;
    }
    remove(i);
  }
  int l = 1;
  int r = N/D;
  while (l<=r)  {
    int m = (l+r) >> 1;
    if (check(N,m)) l = m+1;
    else {
      for (auto it : placed) {
        skip[it] = 1;
        remove(it);
      }
      r = m-1;
    }
  }
  return r;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 75