Submission #1056242

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056242		vjudge1	Rarest Insects (IOI22_insects)	C++17	65.19 / 100	99 ms	1372 KiB

insects

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

using namespace std;

using vi = vector<int>;
using ii = pair<int, int>;

bool gasit = false;

set<int> Cur;

vector<ii> cauta(vi Cul, vi V) {
    vector<ii> Re;
    if(gasit) return Re;
    if(V.empty()) {
        gasit = true;
        return vector<ii>();
    }
    if(Cul.size() == 1) {
        for(auto it : V) Re.push_back({it, Cul[0]});
        return Re;
    }
    vi C1, C2;
    for(int i = 0; i < int(Cul.size()) / 2; ++i) {
        C1.push_back(Cul[i]);
    }
    for(int i = int(Cul.size()) / 2; i < int(Cul.size()); ++i) {
        C2.push_back(Cul[i]);
    }
    set<int> SC1;
    for(auto it : C1) SC1.insert(it);
    
    vi de_scos;

    for(auto it : Cur) {
        if(!SC1.count(it))
            de_scos.push_back(it);
    }

    for(auto it : de_scos) {
        Cur.erase(it);
        move_outside(it);
    }

    for(auto it : C1) {
        if(!Cur.count(it)) {
            move_inside(it);
            Cur.insert(it);
        }
    }
    vi V1, V2;
    for(auto it : V) {
        move_inside(it);
        if(press_button() == 2) V1.push_back(it);
        else V2.push_back(it);
        move_outside(it);
    }
//    for(auto it : C1) {
//        move_outside(it);
//    }

    auto Re1 = cauta(C1, V1), Re2 = cauta(C2, V2);
    for(auto it : Re1) Re.push_back(it);
    for(auto it : Re2) Re.push_back(it);
    return Re;
}

int min_cardinality(int n) {
    vi Cul, Rest;
    for(int i = 0; i < n; ++i) {
        move_inside(i);
        if(press_button() == 1) {
            Cur.insert(i);
            Cul.push_back(i);
        } else {
            move_outside(i);
            Rest.push_back(i);
        }
    }
    if(Cul.size() > Rest.size()) return 1;
    auto Per = cauta(Cul, Rest);
    if(gasit) return 1;
    map<int, int> Fr;
    for(auto it : Cul) ++Fr[it];
    for(auto [p, cul] : Per) ++Fr[cul];
    int mi = n;
    for(auto [cul, fr] : Fr) mi = min(mi, fr);
    return mi;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 40.19 / 75