Submission #1200918

#	Time	Username	Problem	Language	Result	Execution time	Memory
1200918		Zbyszek99	Rarest Insects (IOI22_insects)	C++20	100 / 100	20 ms	520 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;


int min_cardinality(int n) 
{
    random_start();
    vi nums;
    rep(i,n) nums.pb(i);
    shuffle(all(nums),mt);
    int P = 0;
    set<int> cur_in;
    set<int> not_add;
    forall(it,nums)
    {
        move_inside(it);
        if(press_button() == 2)
        {
            move_outside(it);
        }
        else
        {
            P++;
            cur_in.insert(it); 
        }
    }
    int l = 1;
    int r = n/P;
    int ans = 1;
    while(l <= r)
    {
        int mid = (l+r)/2;
        vi new_ = {};
        vi new_del = {};
        forall(it,nums)
        {
            if(mid * P == siz(cur_in)) break;
            if(cur_in.find(it) == cur_in.end() && not_add.find(it) == not_add.end())
            {
                move_inside(it);
                cur_in.insert(it);
                if(press_button() <= mid)
                {
                    new_.pb(it);
                }
                else
                {
                    move_outside(it);
                    cur_in.erase(cur_in.find(it));
                    new_del.pb(it);
                }
            }
        }
        if(mid*P == siz(cur_in))
        {
            ans = mid;
            l = mid+1;
        }
        else
        {
            r = mid-1;
            forall(it,new_del) not_add.insert(it);
            forall(it,new_)
            {
                move_outside(it);
                cur_in.erase(cur_in.find(it));
            }
        }
    }
    return ans;
}

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