제출 #794407

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
794407		IvanJ	드문 곤충 (IOI22_insects)	C++17	53.37 / 100	143 ms	572 KiB

insects

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

#define pb push_back
#define x first
#define y second
#define all(a) (a).begin(), (a).end()

using namespace std;

typedef long long ll;
typedef pair<int, int> ii;

const int maxn = 2005;

int n, D, step;
int vis[maxn];
int forb[maxn];
vector<ii> in;
vector<int> p;

int check(int x) {
	for(int i : p) {
		if(vis[i] || forb[i]) continue;
		move_inside(i);
		if(press_button() > x) 
			move_outside(i), forb[i] = 1;
		else in.pb({i, step}), vis[i] = 1;
		if((int)in.size() == x * D) return 1;
	}
	return 0;
}

int min_cardinality(int N) {
	srand(time(0));
	n = N, D = 0, step = 1;
	
	for(int i = 0;i < n;i++) p.pb(i);
	random_shuffle(all(p));
	
	for(int i : p) {
		move_inside(i);
		if(press_button() > 1) 
			move_outside(i);
		else in.pb({i, step}), vis[i] = 1, D++;
	}
	
	int lo = 1, hi = n, ans = 1;
	while(lo <= hi) {
		step++;
		int mid = (lo + hi + 1) / 2;
		int flag = check(mid);
		if(flag) {
			ans = mid, lo = mid + 1;
			for(int i = 0;i < n;i++) forb[i] = 0;
		} else {
			hi = mid - 1;
			while(in.back().y == step)
				move_outside(in.back().x), vis[in.back().x] = 0, in.pop_back();
		}
	}
	return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 28.37 / 75