Submission #658615

#	Time	Username	Problem	Language	Result	Execution time	Memory
658615		pere_gil	Rarest Insects (IOI22_insects)	C++17	0 / 100	38 ms	288 KiB

insects

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

const int MAX_N=2005;
int f[MAX_N];
bool in[MAX_N];
int tot_in;

int get_dif(int n){
	int dif=0;
	bool in[n]={};
	int prev=0;
	for(int i=0;i<n;i++){
		move_inside(i);
		int q=press_button();

		if(q!=prev) f[i]=q;
		
		if(q>1) move_outside(i);
		else{
			in[i]=true;
			dif++;
		}

		prev=q;
	}
	for(int i=0;i<n;i++) if(in[i]) move_outside(i);
	return dif;
}

bool check(int n, int dif, int x){
	vector<int> aux;
	int prev=0;
	for(int i=0;i<n;i++){
		if(in[i] || f[i]>x) continue;

		move_inside(i);
		int q=press_button();

		if(q!=prev) f[i]=q;

		if(q>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_dif(n);
	
	if(dif==n) return 1;
	if(dif==1) return n;
	
	memset(f,0,sizeof f);
	memset(in,false,sizeof in);
	tot_in=0;

	int l=1,r=n/dif;
	while(l+1<=r){
		int med=(l+r)/2;
		if(check(n,dif,med)) l=med;
		else r=med;
	}
	
	return l;
}

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