Submission #630798

#	Time	Username	Problem	Language	Result	Execution time	Memory
630798		Mahtimursu	Rarest Insects (IOI22_insects)	C++17	59.03 / 100	166 ms	540 KiB

insects

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

using namespace std;

vector<int> v; 
int inside = 0;

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

int min_cardinality(int n) {
    int uniq = 0;
    for (int i = 0; i < n; ++i) {
        move_inside(i);

        if (press_button() > 1) {
            move_outside(i);
            v.push_back(i);
        } else uniq++;
    }

    if (uniq == 1) return n;
    if (uniq > n / 2) return 1;

    inside = uniq;
    int ans = 1;

    for (int k = 2 << 10; k >= 1; k /= 2) {
        if (ans + k > n / 2) continue;
        
        vector<int> in;

        int mx = ans + k;
        int gc = 0;

        shuffle(v.begin(), v.end(), rng);

        for (int x : v) {
            move_inside(x);

            if (press_button() > mx) {
                move_outside(x);
            } else {
                in.push_back(x);
                gc++;
            }
        }
 
        if ((inside + gc) / mx == uniq) {
            ans += k;
            inside += gc;
            for (int x : in) v.erase(find(v.begin(), v.end(), x));
        } else {
            v = in;
            for (int x : in) move_outside(x);
        }
    }

    return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 34.03 / 75