Submission #1205616

#	Time	Username	Problem	Language	Result	Execution time	Memory
1205616		countless	The Collection Game (BOI21_swaps)	C++20	21 / 100	20 ms	424 KiB

swaps

//
// --- Sample implementation for the task swaps ---
//
// To compile this program with the sample grader, place:
//     swaps.h swaps_sample.cpp sample_grader.cpp
// in a single folder and run:
//     g++ swaps_sample.cpp sample_grader.cpp
// in this folder.
//

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

typedef long long ll;
typedef long double ld;

const ll MOD = 998244353;
const ll INF = 1e18;
const ld EPS = 1e-12;

#define endl "\n"
#define sp <<" "<<
#define REP(i, a, b) for(ll i = a; i < b; i++)
#define dbg(x) cout << #x << " = " << x << endl
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define fast_io() ios_base::sync_with_stdio(false); cin.tie(NULL)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) ((ll)(x).size())

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

template <typename Key, typename Value>
using hash_map = unordered_map<Key, Value, custom_hash>;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// uniform_int_distribution<int>(a, b)(rng);
// shuffle(all(a), rng);

void solve(int n, int v) {
    // st 1-2
    // int m = n;
    // vector<pair<int, int>> cnt(n+1);
    // REP(i, 1, n+1) {
    //     cnt[i] = {0, i};
    // }

    // vector<int> a(n), ans(n);
    // iota(all(a), 1);
    // if (n % 2) a.push_back(n+1), m++;

    // auto steal = [&](vector<pair<int, int>> &queries) -> void {
    //     for (auto &[a, b] : queries) {
    //         schedule(a, b);
    //     }

    //     vector<int> res = visit();

    //     REP(i, 0, queries.size()) {
    //         if (res[i] == 1) {
    //             cnt[queries[i].first].first++;
    //         } else {
    //             cnt[queries[i].second].first++;
    //         }
    //     }
    // };

    // REP(i, 0, m - 1) {
    //     vector<pair<int, int>> queries;
    //     REP(j, 0, m / 2) {
    //         int p1 = a[j], p2 = a[m - j - 1];
    //         if (p1 != n+1 and p2 != n+1) {
    //             queries.push_back({p1, p2});
    //         }
    //     }

    //     steal(queries);

    //     vector<int> b(m);
    //     b[0] = a[0], b[1] = a[m-1];
    //     REP(i, 2, m) {
    //         b[i] = a[i-1];
    //     }

    //     a.swap(b);
    // }

    // sort(all(cnt));

    // REP(i, 1, n+1) {
    //     ans[i-1] = cnt[i].second;
    // }

    // reverse(all(ans));

    // answer(ans);

    // st 3-5
    int m = n;
    vector<int> a(n), ans(n);
    iota(all(a), 1);
    if (n % 2) a.push_back(n+1), m++;

    auto left = [&]() -> void {
        for (int i = 1; i < n; i+=2) {
            schedule(i, i+1);
        }

        visit();
    };

    auto right = [&]() -> void {
        for (int i = 2; i < n; i+=2) {
            schedule(i, i+1);
        }

        visit();
    };

    REP(i, 0, n) {
        if (i % 2 == 0) {
            left();
        } else {
            right();
        }
    }

    iota(all(ans), 1);

    answer(ans);
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3-1: 3 / 3
• Subtask 3-2: 0 / 2
• Subtask 4-1: 9 / 9
• Subtask 4-2: 0 / 6
• Subtask 5-1: 9 / 9
• Subtask 5-2: 0 / 6
• Subtask 6-1: 0 / 21
• Subtask 6-2: 0 / 14
• Subtask 7-1: 0 / 9
• Subtask 7-2: 0 / 6