Submission #924727

#	Time	Username	Problem	Language	Result	Execution time	Memory
924727		boris_mihov	Monster Game (JOI21_monster)	C++17	0 / 100	70 ms	712 KiB

monster

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

typedef long long llong;
const int MAXN = 1000 + 10;
const int INF  = 1e9;

std::mt19937 rng(69420);
void rec(std::vector <int> &v)
{
    if (v.size() <= 1)
    {
        return;
    }

    if (v.size() == 2)
    {
        if (!Query(v[0], v[1])) std::swap(v[0], v[1]);
        return;
    }

    int idx = rng() % v.size();
    std::swap(v[0], v[idx]);
    int pivot = v[0];

    std::vector <int> left, right;
    for (int i = 1 ; i < v.size() ; ++i)
    {
        if (Query(pivot, v[i])) left.push_back(v[i]);
        else right.push_back(v[i]);
    }

    left.push_back(pivot);
    rec(left);
    rec(right);

    v.clear();
    for (const int &i : left)
    {
        v.push_back(i);
    }

    for (const int &i : right)
    {
        v.push_back(i);
    }
}

std::vector <int> res;
std::vector <int> Solve(int n) 
{
    std::vector <int> v(n);
    std::iota(v.begin(), v.end(), 0);
    rec(v); res.resize(n);
    for (int i = 0 ; i < n ; ++i)
    {
        res[v[i]] = i;
    }

    return res;
}

Compilation message (stderr)

monster.cpp: In function 'void rec(std::vector<int>&)':
monster.cpp:32:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for (int i = 1 ; i < v.size() ; ++i)
      |                      ~~^~~~~~~~~~

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