Submission #546842

#	Time	Username	Problem	Language	Result	Execution time	Memory
546842		LucaDantas	Counting Mushrooms (IOI20_mushrooms)	C++17	91.87 / 100	12 ms	464 KiB

mushrooms

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

constexpr int repeticoes = 100;

vector<int> color[2];

int count_mushrooms(int N) {
    int cnt[2]{};
    color[0] = {0};
    
    vector<int> unknown(N-1);
    iota(unknown.begin(), unknown.end(), 1);
    
    bool foi = 0;
    while(unknown.size()) {
        int usar = color[1].size() > color[0].size(); // escolho o grupo que tem mais gente pra usar
        int sz = color[usar].size();

        if(sz == 2 && !foi) {
            // pego alguns caras q dao pra escolher duas vezes
            foi = 1;

            for(int sla = 0; sla < repeticoes && unknown.size(); sla++) {
                vector<int> qr;
                for(int i = 0; i < sz && unknown.size(); i++, unknown.pop_back())
                    qr.push_back(color[usar][i]), qr.push_back(unknown.back());

                int resp = use_machine(qr);

                color[usar ^ (resp&1)].push_back(qr.back());
                if(qr.size() < 4) continue;
                resp >>= 1;
                color[usar ^ (resp&1)].push_back(qr[1]);
            }

            continue;
        }

        vector<int> qr;
        for(int i = 0; i < sz && unknown.size(); i++, unknown.pop_back())
            qr.push_back(color[usar][i]), qr.push_back(unknown.back());

        int resp = use_machine(qr);

        color[usar ^ (resp&1)].push_back(qr.back());

        cnt[usar^1] += resp/2;
        cnt[usar] += (qr.size() / 2 - 1) - resp/2;
    }

    return cnt[0] + color[0].size();
}

• Subtask 1: 91.8699 / 100