Submission #1135071

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135071		Saul0906	Rarest Insects (IOI22_insects)	C++20	57.92 / 100	39 ms	512 KiB

insects

#include "insects.h"
#include <vector>
#include <bits/stdc++.h>
#define rep(a,b,c) for(ll a=b; a<c; a++)
#define repr(a,b,c) for(ll a=b-1; a>c-1; a--)
#define repa(a,b) for(auto a:b)
#define ll long long
#define pll pair<ll, ll>
#define fi first
#define se second
#define pb push_back
#define mid ((l+r)>>1)
#define ppb pop_back()

using namespace std;
using vi = vector<int>;

const int N=2005;
int dsu[N], sz[N];

int find(int x){
	if(dsu[x]==-1) return x;
	return dsu[x]=find(dsu[x]);
}

void join(int x, int y){
	x=find(x);
	y=find(y);
	if(x==y) return;
	dsu[x]=y;
	sz[y]+=sz[x];
}

vi a;

void solve(int l, int r, vi b){
	if(l==r){
		move_outside(a[l]);
		repa(e,b) join(e,a[l]);
		return;
	}
	rep(i,mid+1,r+1) move_outside(a[i]);
	vi bl, br;
	repa(e,b){
		move_inside(e);
		if(press_button()==2) bl.pb(e);
		else br.pb(e);
		move_outside(e);
	}
	solve(l,mid,bl);
	rep(i,mid+1,r+1) move_inside(a[i]);
	solve(mid+1,r,br);
}

int min_cardinality(int n) {
	int ans=n;
	fill(dsu,dsu+n,-1);
	fill(sz,sz+n,1);
	vi b;
	rep(i,0,n){
		move_inside(i);
		a.pb(i);
		if(press_button()==2){
			move_outside(i);
			a.pop_back();
			b.pb(i);
		}
	}
	solve(0,a.size()-1,b);
	rep(i,0,n) ans=min(ans,sz[find(i)]);
	return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 32.92 / 75