Submission #658600

#	Time	Username	Problem	Language	Result	Execution time	Memory
658600		pere_gil	Rarest Insects (IOI22_insects)	C++17	47.50 / 100	238 ms	488 KiB

insects

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

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){
	int tot_in=0;
	bool in[n]={};
	for(int i=0;i<n;i++){
		move_inside(i);
		if(press_button()>x) move_outside(i);
		else{
			in[i]=true;
			tot_in++;
		}
	}
	for(int i=0;i<n;i++) if(in[i]) move_outside(i);

	//printf("%d: %d | %d\n",x,tot_in,x*dif);
	
	return x*dif==tot_in;
}

int min_cardinality(int n) {
	int dif=get(n);

	if(dif==1) return n;

	//printf("%d\n",dif);
	
	int l=1,r=n;
	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: 22.5 / 75