Submission #492691

#TimeUsernameProblemLanguageResultExecution timeMemory
492691Jarif_RahmanMonster Game (JOI21_monster)C++17
100 / 100
118 ms4416 KiB
#include "monster.h"
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

vector<vector<int>> QQ;
bool query(int a, int b){
  if(a > b){
    if(QQ[b][a] == -1) QQ[b][a] = Query(b, a);
    return !QQ[b][a];
  }
  else{
    if(QQ[a][b] == -1) QQ[a][b] = Query(a, b);
    return QQ[a][b];
  }
}

template<typename it>
    void merge_sort(it a, it b){
        int n = b-a;
        if(n == 1) return;
        merge_sort(a, a+n/2);
        merge_sort(a+n/2, b);
        int* ab = new int[n];
        merge(a, a+n/2, a+n/2, b, ab, [&](int x, int y){
            return query(y, x);
        });
        for(int i = 0; i < n; i++) *(a+i) = *(ab+i);
    }

    vector<int> Solve(int n){
        QQ = vector<vector<int>>(n, vector<int>(n, -1));

        vector<int> sth(n);
        for(int i = 0; i < n; i++) sth[i] = i;
        random_shuffle(sth.begin(), sth.end());
        merge_sort(sth.begin(), sth.end());

        auto win = [=](int x){
            vector<int> rt;
            for(int i = 0; i < n; i++) if(i != x && query(x, i)) rt.pb(i);
            return rt;
        };

        int z = -1, k = min(n, 10);
        vector<int> cnt(k, 0), ss(k);
        for(int i = 0; i < k; i++) ss[i] = i;
        for(int i = 0; i < k; i++){
            for(int j = 0; j < k; j++) if(i != j) cnt[i]+=query(sth[i], sth[j]);
        }

        sort(ss.begin(), ss.end(), [&](int x, int y){
            return cnt[x] < cnt[y];
        });
        if(query(sth[ss[0]], sth[ss[1]])) z = ss[0];
        else z = ss[1];

        reverse(sth.begin(), sth.begin()+z+1);

        for(;z+1 < n; z++){
            for(int i = z+1; i < n; i++) if(query(sth[z], sth[i])){
                reverse(sth.begin()+z+1, sth.begin()+i+1);
                z = i;
            }
        }

        vector<int> ans(n);
        for(int i = 0; i < n; i++) ans[sth[i]] = i;
        return ans;
    }

Compilation message (stderr)

monster.cpp: In function 'std::vector<int> Solve(int)':
monster.cpp:43:14: warning: variable 'win' set but not used [-Wunused-but-set-variable]
   43 |         auto win = [=](int x){
      |              ^~~
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