Submission #1227880

#	Time	Username	Problem	Language	Result	Execution time	Memory
1227880		jasonic	Monster Game (JOI21_monster)	C++20	0 / 100	3 ms	432 KiB

monster

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

#define ll long long
#define fastIO cin.tie(0); ios::sync_with_stdio(false)

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

vector<int> dnc(vector<int> idcs, int l, int r) {
    if(idcs.size() == 1) return idcs;
    if(l == r) return idcs;
    if(l == r+1) {
        if(! Query(idcs[0], idcs[1])) { // 0 is less than
            swap(idcs[0], idcs[1]);
        }
        return idcs;
    }

    int rand = rng();
    int pivot = abs(rand)%idcs.size();
    vector<int> la, ra;

    for(int i = 0; i < idcs.size(); i++) {
        if(i == pivot) continue;
        if(Query(idcs[pivot], idcs[i])) {
            la.push_back(idcs[i]);
        } else ra.push_back(idcs[i]);
    }

    // cout << idcs[pivot] << '\n';
    // for(auto &i : la) cout << i << ' '; cout << '\n';
    // for(auto &i : ra) cout << i << ' '; cout << '\n';

    la = dnc(la, l, l+la.size()-1);
    ra = dnc(ra, l+la.size()+1, r);

    vector<int> ans;
    
    // case 1, we dont break
    if(min(la.size(), ra.size()) != 1) {
        ans.insert(ans.end(), la.begin(), la.end());
        ans.push_back(idcs[pivot]);
        ans.insert(ans.end(), ra.begin(), ra.end());
        swap(ans[la.size()-1], ans[la.size()+1]);
    } else {
        // case 2.1 we are on the edge
        if(la.size() == 1) {
            if(Query(la[0], ra[0])) {
                // the pivot is the smallest
                ans.push_back(idcs[pivot]);
                ans.push_back(la[0]);
                ans.insert(ans.end(), ra.begin(), ra.end());
            } else {
                ans.insert(ans.end(), la.begin(), la.end());
                ans.push_back(idcs[pivot]);
                ans.insert(ans.end(), ra.begin(), ra.end());
                swap(ans[la.size()-1], ans[la.size()+1]);
            }
        } else {
            if(Query(ra[0], la[la.size()-1])) {
                // the pivot is the biggest
                ans.insert(ans.end(), la.begin(), la.end());
                ans.push_back(ra[0]);
                ans.push_back(idcs[pivot]);
            } else {
                ans.insert(ans.end(), la.begin(), la.end());
                ans.push_back(idcs[pivot]);
                ans.insert(ans.end(), ra.begin(), ra.end());
                swap(ans[la.size()-1], ans[la.size()+1]);
            }
        }
    }

    return ans;
}

vector<int> Solve(int n) {
    vector<int> arr; for(int i = 0; i < n; i++) arr.push_back(i);
    vector<int> ans1 = dnc(arr, 0, n-1);
    vector<int> ans2(n);

    for(int i = 0; i < n; i++) ans2[ans1[i]] = i;

    return ans2;
}

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