#891330 (C++14) No.2384 Permutations of Permutations

• 問題: No.2384 Permutations of Permutations
• ユーザー: shift_aaa
• 提出日時: 2023-07-14 22:39:10
• 言語: C++14 (gcc 13.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 3 ms / 2,000 ms
• コード長: 2,139 bytes
• コンパイル時間: 4,293 ms
• コンパイル使用メモリ: 250,384 KB
• 実行使用メモリ: 5,376 KB
• 最終ジャッジ日時: 2024-09-16 07:43:09
• 合計ジャッジ時間: 5,182 ms
• ジャッジサーバーID （参考情報）: judge2 / judge3

ファイルパターン	結果
sample	AC * 2
other	AC * 22

ソースコード

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//#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
#include <atcoder/all>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <typename T>
using ordered_set = tree<T, null_type, std::less<T>, rb_tree_tag, tree_order_statistics_node_update>;
using namespace std;
#define all(n) begin(n), end(n)
const long long INF = INT_MAX / 2;
typedef long long ll;
typedef vector<int> vint;
typedef vector<vector<int>> vvint;
typedef vector<ll> vll;
typedef vector<vector<ll>> vvll;
typedef unsigned long long ull;
template <class T>
bool chmax(T &a, const T &b)
{
    if (a < b)
    {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
bool chmin(T &a, const T &b)
{
    if (b < a)
    {
        a = b;
        return 1;
    }
    return 0;
}
template <typename T>
vector<T> make_v(size_t a) { return vector<T>(a); }
template <typename T, typename... Ts>
auto make_v(size_t a, Ts... ts)
{
    return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}
template <typename T, typename V>
typename enable_if<is_class<T>::value == 0>::type
fill_v(T &t, const V &v) { t = v; }
template <typename T, typename V>
typename enable_if<is_class<T>::value != 0>::type
fill_v(T &t, const V &v)
{
    for (auto &e : t)
        fill_v(e, v);
}
using mint = atcoder::modint998244353;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, k;
    cin >> n >> k;
    mint ans = 0;
    if (n != 2)
    {
        mint fact = 1;
        for (int i = 1; i <= n-k; i++)
        {
            fact *= i;
        }
        if (n != 6) {
            cout << (k * fact).val() << endl;
        }else {
            ans = k * fact;
            if (k == 2) {
                ans += 6 * 24;
            }
            if (k == 3) {
                ans += 36;
            }
            if (k == 4){
                ans += 8;
            }
            if(k == 5) {
                ans += 5;
            }
            if (k == 6)
            {
            }
            cout << ans.val() << endl;
        }
    }
    else if (n == 2)
    {
        // Aut(S_2) = 1
        cout << 1 << endl;
    }
    return 0;
}
 
 
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