Submission #736442

#	Time	Username	Problem	Language	Result	Execution time	Memory
736442		puppy	Rarest Insects (IOI22_insects)	C++17	39.18 / 100	332 ms	440 KiB

insects

#include "insects.h"
#include <vector>
#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
pair<vector<int>, int> check(vector<int> vc, int tst)
{
    vector<bool> u(vc.size());
    vector<int> toremove;
    for (int i = 0; i < (int)vc.size(); i++) {
        move_inside(vc[i]);
        if (press_button() > tst) {
            move_outside(vc[i]);
            u[i] = true;
        }
        else toremove.push_back(vc[i]);
    }
    for (int i:toremove) move_outside(i);
    toremove.clear();
    int cnt = 0;
    for (int i = 0; i < (int)vc.size(); i++) {
        if (!u[i]) continue;
        move_inside(vc[i]);
        if (press_button() > 1) {
            move_outside(vc[i]);
        }
        else {
            toremove.push_back(vc[i]);
            cnt++;
        }
    }
    for (int i = 0; i < (int)vc.size(); i++) {
        if (u[i]) continue;
        move_inside(vc[i]);
        if (press_button() > 1) u[i] = true;
        move_outside(vc[i]);
    }
    for (int i:toremove) move_outside(i);
    vector<int> nxt;
    for (int i = 0; i < (int)vc.size(); i++) {
        if (!u[i]) nxt.push_back(vc[i]);
    }
    return make_pair(nxt, cnt);
}
int random(int l, int r)
{
    return rand() % (r - l + 1) + l;
}

int get_min(vector<int> vc, int spec)
{
    if (spec == 1) return vc.size();
    int mx = vc.size() / spec;
    int mi = 1;
    while (1) {
        int tst = random(mi, mx);
        auto [v, k] = check(vc, tst);
        if (v.size() == vc.size()) return mx;
        if (v.size() == 0) mi = tst + 1;
        else return get_min(v, spec - k);
    }
}
int min_cardinality(int N) {
    srand(time(NULL));
    vector<int> vc;
    for (int i = 0; i < N; i++) vc.push_back(i);
    int cnt = 0;
    vector<int> toremove;
    for (int i = 0; i < N; i++) {
        move_inside(i);
        if (press_button() >= 2) {
            move_outside(i);
        }
        else {
            toremove.push_back(i);
            cnt++;
        }
    }
    for (int i:toremove) move_outside(i);
    return get_min(vc, cnt);
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 14.18 / 75