Submission #658609

#	Time	Username	Problem	Language	Result	Execution time	Memory
658609		pere_gil	Rarest Insects (IOI22_insects)	C++17	53.13 / 100	185 ms	332 KiB

insects

#include "insects.h"
#include "bits/stdc++.h"
using namespace std;

vector<bool> in;
int tot_in;

int get(int n){
	int res=0;
	bool in[n]={};
	for(int i=0;i<n;i++){
		move_inside(i);
		if(press_button()>1) move_outside(i);
		else{
			res++;
			in[i]=true;
		}
	}
	for(int i=0;i<n;i++) if(in[i]) move_outside(i);
	return res;
}
     
bool check(int n, int x, int dif){
	vector<int> aux;
	for(int i=0;i<n;i++){
		if(in[i]) continue;
		move_inside(i);
		if(press_button()>x) move_outside(i);
		else{
			in[i]=true;
			tot_in++;
			aux.push_back(i);
		}
		if(tot_in==x*dif) return true;
	}

	for(int i: aux){
		in[i]=false;
		tot_in--;
		move_outside(i);
	}
	return false;
}
     
int min_cardinality(int n) {
	int dif=get(n);
     
	if(dif==1) return n;
     
	in.assign(n,false);
	tot_in=0;
    	
	int l=1,r=n/dif+1;
	while(l+1<r){
		int med=(l+r)/2;
		if(check(n,med,dif)) l=med;
		else r=med;
	}
	return l;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 28.13 / 75