Submission #931707

#	Time	Username	Problem	Language	Result	Execution time	Memory
931707		boris_mihov	Chameleon's Love (JOI20_chameleon)	C++17	40 / 100	15 ms	472 KiB

chameleon

#include "chameleon.h"
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <vector>

const int MAXN = 500 + 10;

int perm[MAXN];
bool found[2 * MAXN];
std::vector <int> candidates[MAXN];
void Solve(int n) 
{
    for (int i = 1 ; i <= 2 * n ; ++i)
    {
        for (int j = 1 ; j <= 2 * n ; ++j)
        {
            if (i == j)
            {
                continue;
            }

            if (Query({i, j}) == 1)
            {
                // std::cout << "here: " << i << ' ' << j << '\n';
                candidates[i].push_back(j);
            }
        }

        if (candidates[i].size() == 3)
        {
            if (Query({candidates[i][0], candidates[i][2], i}) == 1)
            {
                std::swap(candidates[i].back(), candidates[i][1]);
            } else if (Query({candidates[i][1], candidates[i][2], i}) == 1)
            {
                std::swap(candidates[i].back(), candidates[i][0]);
            }

            candidates[i].pop_back();
        }

        // std::cout << "size: " << i << ' ' << candidates[i].size() << '\n';
        // for (const int &j : candidates[i]) std::cout << j << ' '; std::cout << '\n';
    }

    std::iota(perm + 1, perm + 1 + 2 * n, 1);
    std::sort(perm + 1, perm + 1 + 2 * n, [&](int x, int y)
    {
        return candidates[x].size() < candidates[y].size();
    });

    for (int idx = 1 ; idx <= 2 * n ; ++idx)
    {
        int i = perm[idx];
        if (found[i])
        {
            continue;
        }

        if (candidates[i].size() == 1)
        {
            Answer(i, candidates[i][0]);
            found[candidates[i][0]] = true;
            // std::cout << "answer: " << i << ' ' << candidates[i][0] << '\n';   
            continue;
        }
        
        assert(candidates[i].size() == 2);
        bool shouldBreak = false;

        for (const int &j : candidates[i])
        {
            for (const int &x : candidates[j])
            {
                if (x == i)
                {
                    // std::cout << "answer: " << i << ' ' << j << '\n';
                    Answer(i, j);
                    found[j] = true;
                    shouldBreak = true;
                    break;
                }
            }
            
            if (shouldBreak)
            {
                break;
            }
        }
    }
}

• Subtask 1: 0 / 4
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36