Submission #1223789

#	Time	Username	Problem	Language	Result	Execution time	Memory
1223789		bangan	Rarest Insects (IOI22_insects)	C++20	25 / 100	55 ms	420 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>
using namespace std;

#define pb push_back

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

int n;
int unq;

bool ok(int k) {
    vector<int> in;
    for (int i=0; i<n; i++) {
        move_inside(i);
        if (press_button() > k) move_outside(i);
        else in.pb(i);
    }
    bool ret = unq * k == in.size();
    while (!in.empty()) {
        move_outside(in.back());
        in.pop_back();
    }
    return ret;
}

int min_cardinality(int N) {
    vector<int> in;
    for (int i = 0; i < N; i++) {
        move_inside(i);
        if (press_button() == 2) move_outside(i);
        else in.pb(i);
    }

    unq = in.size();
    while (!in.empty()) {
        move_outside(in.back());
        in.pop_back();
    }

    n = N;
    int l = 1, r = 1000 + 4;
    while (l != r) {
        int mid = (l+r+1) / 2;
        ok(mid) ? l = mid : r = mid - 1;
    }
    return r;
}

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