結果

問題 No.243 出席番号(2)
ユーザー 👑 はまやんはまやんはまやんはまやん
提出日時 2019-01-19 18:09:49
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
WA  
実行時間 -
コード長 4,198 bytes
コンパイル時間 1,800 ms
コンパイル使用メモリ 170,320 KB
実行使用メモリ 4,384 KB
最終ジャッジ日時 2023-09-25 06:09:33
合計ジャッジ時間 6,539 ms
ジャッジサーバーID
(参考情報)
judge14 / judge11
このコードへのチャレンジ(β)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 90 ms
4,376 KB
testcase_01 AC 89 ms
4,376 KB
testcase_02 AC 89 ms
4,376 KB
testcase_03 AC 89 ms
4,380 KB
testcase_04 AC 89 ms
4,376 KB
testcase_05 AC 89 ms
4,376 KB
testcase_06 AC 90 ms
4,376 KB
testcase_07 WA -
testcase_08 AC 89 ms
4,380 KB
testcase_09 AC 90 ms
4,380 KB
testcase_10 AC 89 ms
4,376 KB
testcase_11 AC 89 ms
4,376 KB
testcase_12 WA -
testcase_13 AC 89 ms
4,376 KB
testcase_14 AC 90 ms
4,376 KB
testcase_15 AC 89 ms
4,376 KB
testcase_16 AC 90 ms
4,376 KB
testcase_17 WA -
testcase_18 AC 89 ms
4,376 KB
testcase_19 AC 90 ms
4,376 KB
testcase_20 AC 90 ms
4,376 KB
testcase_21 AC 90 ms
4,380 KB
testcase_22 WA -
testcase_23 AC 90 ms
4,380 KB
testcase_24 AC 90 ms
4,376 KB
testcase_25 AC 89 ms
4,380 KB
testcase_26 AC 91 ms
4,376 KB
testcase_27 AC 90 ms
4,380 KB
testcase_28 AC 90 ms
4,380 KB
testcase_29 AC 89 ms
4,380 KB
testcase_30 AC 89 ms
4,376 KB
testcase_31 AC 89 ms
4,380 KB
testcase_32 AC 89 ms
4,380 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
//#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60;
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<int MOD> struct ModInt {
    static const int Mod = MOD; unsigned x; ModInt() : x(0) { }
    ModInt(signed sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    ModInt(signed long long sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    int get() const { return (int)x; }
    ModInt &operator+=(ModInt that) { if ((x += that.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator-=(ModInt that) { if ((x += MOD - that.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator*=(ModInt that) { x = (unsigned long long)x * that.x % MOD; return *this; }
    ModInt &operator/=(ModInt that) { return *this *= that.inverse(); }
    ModInt operator+(ModInt that) const { return ModInt(*this) += that; }
    ModInt operator-(ModInt that) const { return ModInt(*this) -= that; }
    ModInt operator*(ModInt that) const { return ModInt(*this) *= that; }
    ModInt operator/(ModInt that) const { return ModInt(*this) /= that; }
    ModInt inverse() const { long long a = x, b = MOD, u = 1, v = 0;
        while (b) { long long t = a / b; a -= t * b; std::swap(a, b); u -= t * v; std::swap(u, v); }
        return ModInt(u); }
    bool operator==(ModInt that) const { return x == that.x; }
    bool operator!=(ModInt that) const { return x != that.x; }
    ModInt operator-() const { ModInt t; t.x = x == 0 ? 0 : Mod - x; return t; }
};
template<int MOD> ostream& operator<<(ostream& st, const ModInt<MOD> a) { st << a.get(); return st; };
template<int MOD> ModInt<MOD> operator^(ModInt<MOD> a, unsigned long long k) {
    ModInt<MOD> r = 1; while (k) { if (k & 1) r *= a; a *= a; k >>= 1; } return r; }
template<typename T, int FAC_MAX> struct Comb { vector<T> fac, ifac;
    Comb(){fac.resize(FAC_MAX,1);ifac.resize(FAC_MAX,1);rep(i,1,FAC_MAX)fac[i]=fac[i-1]*i;
        ifac[FAC_MAX-1]=T(1)/fac[FAC_MAX-1];rrep(i,FAC_MAX-2,1)ifac[i]=ifac[i+1]*T(i+1);}
    T aPb(int a, int b) { if (b < 0 || a < b) return T(0); return fac[a] * ifac[a - b]; }
    T aCb(int a, int b) { if (b < 0 || a < b) return T(0); return fac[a] * ifac[a - b] * ifac[b]; }
    T nHk(int n, int k) { if (n == 0 && k == 0) return T(1); if (n <= 0 || k < 0) return 0;
        return aCb(n + k - 1, k); }}; // nHk = (n+k-1)Ck : n is separator
typedef ModInt<1000000007> mint;
/*---------------------------------------------------------------------------------------------------
            ∧_∧  
      ∧_∧  (´<_` )  Welcome to My Coding Space!
     ( ´_ゝ`) /  ⌒i     
    /   \     | |     
    /   / ̄ ̄ ̄ ̄/  |  
  __(__ニつ/     _/ .| .|____  
     \/____/ (u ⊃  
---------------------------------------------------------------------------------------------------*/









int N, A[5010];
int cnt[5010];
mint dp[2][5010];
Comb<mint, 101010> com;
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> N;
    rep(i, 0, N) {
        cin >> A[i];
        cnt[A[i]]++;
    }

    dp[0][0] = 1;
    rep(ai, 0, 5000) {
        int cu = ai % 2;
        int to = 1 - cu;

        rep(ng, 0, 5001) dp[to][ng] = 0;

        rep(ng, 0, 5000) {
            dp[to][ng] += dp[cu][ng];
            dp[to][ng + 1] += dp[cu][ng] * cnt[ai];
        }
    }

    mint ans = 0;
    rep(ng, 0, N+1) {
        mint d = dp[0][ng] * com.fac[N - ng];
        if (ng % 2 == 0) ans += d;
        else ans -= d;
    }
    cout << ans << endl;
}
0