Submission #1185974

#	Time	Username	Problem	Language	Result	Execution time	Memory
1185974		anmattroi	Rarest Insects (IOI22_insects)	C++17	0 / 100	97 ms	412 KiB

insects

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

using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

vector<int> p;

int cnt;

int pressButton() {
    return press_button();
}

void moveInside(int i) {
    move_inside(p[i]);
}

void moveOutside(int i) {
    move_outside(p[i]);
}

int minCardinality(int N) {
    vector<int> candidates(N);
    iota(candidates.begin(), candidates.end(), 0);

    while (1) {
        int MAX = N / cnt;
        if (candidates.size() == MAX) return MAX;
        vector<int> inside;
        for (int i : candidates) {
            moveInside(i);
            if (pressButton() > MAX) moveOutside(i);
            else inside.emplace_back(i);
        }
        if (int(inside.size()) == cnt * MAX) return MAX;
        assert(int(inside.size()) < cnt * MAX);

        for (int i : inside) moveOutside(i);
        candidates = inside;
    }
}

int min_cardinality(int N) {
    p.assign(N, 0);
    iota(p.begin(), p.end(), 0);
    shuffle(p.begin(), p.end(), rng);

    vector<int> e;
    for (int i = 0; i < N; i++) {
        moveInside(i);
        e.emplace_back(i);
        if (pressButton() > 1) moveOutside(i);
        else ++cnt;
    }

    for (int i : e) moveOutside(i);

    if (cnt == 1) return N;

    return minCardinality(N);
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 75