Submission #635406

#	Time	Username	Problem	Language	Result	Execution time	Memory
635406		Carmel_Ab1	Rarest Insects (IOI22_insects)	C++17	53.13 / 100	179 ms	336 KiB

insects

/*
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
 */
#include<bits/stdc++.h>
#include "insects.h"
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//using namespace __gnu_pbds;
using namespace std;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int>vi;
typedef vector<vector<int>>vvi;
typedef vector<ll>vl;
typedef vector<vl> vvl;
typedef pair<int,int>pi;
typedef pair<ll,ll> pl;
typedef vector<pl> vpl;
typedef vector<ld> vld;
typedef pair<ld,ld> pld;
typedef vector<pi> vpi;

//typedef tree<ll, null_type, less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
template<typename T> ostream& operator<<(ostream& os, vector<T>& a){os<<"[";for(int i=0; i<ll(a.size()); i++){os << a[i] << ((i!=ll(a.size()-1)?" ":""));}os << "]\n"; return os;}

#define all(x) x.begin(),x.end()
#define YES out("YES")
#define NO out("NO")
#define out(x){cout << x << "\n"; return;}
#define outfl(x){cout << x << endl;return;}
#define GLHF ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define print(x){for(auto ait:x) cout << ait << " "; cout << "\n";}
#define pb push_back
#define umap unordered_map

int small_distinct_vals(int n, int diff, vector<bool>in){
    int ans=1;
    while(1){
        int has=0;
        for(int i=0; i<n;i ++){
            if(in[i])continue;
            move_inside(i);
            in[i]=1;
            has++;
            if(press_button()!=ans+1)
                in[i]=0,has--, move_outside(i);
        }

        if(has!=diff)
            break;
        ans++;
    }
    return ans;

}

int min_cardinality(int n){
    int diff=0;
    vector<bool>in(n);

    vi a(n);
    iota(all(a),0);
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
    shuffle(all(a),rng);

    for(int i=0; i<n; i++){
        move_inside(a[i]),in[a[i]]=1;
        diff++;
        if(press_button()!=1)
            move_outside(a[i]),diff--,in[a[i]]=0;
    }

    if(n/diff<=10)
        return small_distinct_vals(n,diff,in);

    int l=2,r=n/diff,ans=1;


    while(l<=r){
        int m=(l+r)/2;

        int good=n;
        for(int i=0; i<n;i ++){
            if(in[a[i]])continue;
            move_inside(a[i]);
            in[a[i]]=1;
            int p=press_button();
            if(p>m)
                good--, move_outside(a[i]), in[a[i]]=0;
        }
        if(diff*m<=good)
            l=m+1,ans=m;
        else {
            r = m - 1;
            if(l>r)break;
            for(int i=0; i<n;i ++)
                if(in[a[i]])
                    in[a[i]]=0, move_outside(a[i]);
        }
    }

    return ans;

}

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