Submission #783335

#	Time	Username	Problem	Language	Result	Execution time	Memory
783335		FEDIKUS	Rarest Insects (IOI22_insects)	C++17	0 / 100	96 ms	320 KiB

insects

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

using namespace std;

const int maxn=2010;

int n;
int tren[maxn];
int perm[maxn];
int klk[maxn];
int unutra=0;
int korak=1;
int raz;

void ubaci(int i){
  if(tren[i]!=0) return;
  tren[i]=korak;
  move_inside(perm[i]);
  unutra++;
}
void izbaci(int i){
  if(tren[i]==0) return;
  tren[i]=0;
  move_outside(perm[i]);
  unutra--;
}
int pitaj(){
  return press_button();
}
int nadji(){
  for(int i=0;i<n;i++){
    ubaci(i);
    if(pitaj()>1){
      izbaci(i);
    }
  }
  return unutra;
}

mt19937 rng(23479);

bool probaj(int gran,int sled){ // da li je >=
  korak++;
  for(int i=0;i<n;i++){
    if(unutra==raz*gran) return true;
    if(tren[i]!=0) continue;
    ubaci(i);
    if((klk[i]=pitaj())>gran){
      izbaci(i);
    }
  }
  if(unutra==raz*gran) return true;
  for(int i=0;i<n;i++) if(tren[i]==korak && klk[i]>sled) izbaci(i);
  return false;
}

int min_cardinality(int _n){
  n=_n;
  for(int i=0;i<n;i++) perm[i]=i;
  shuffle(perm,perm+n,rng);
  raz=nadji();
  int l=1,r=n/raz;
  int res=-1;
  while(l<=r){
    int mid=l+(r-l)/2;
    int sled=l+(mid-1-l)/2;
    if(probaj(mid,sled)){
      res=mid;
      l=mid+1;
    }else r=mid-1;
  }
  return res;
}

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