結果

問題 No.329 全射
ユーザー minami
提出日時 2019-03-30 10:56:34
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 23 ms / 2,000 ms
コード長 3,924 bytes
コンパイル時間 2,055 ms
コンパイル使用メモリ 178,408 KB
実行使用メモリ 7,552 KB
最終ジャッジ日時 2024-11-08 09:04:00
合計ジャッジ時間 4,030 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 40
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 #
プレゼンテーションモードにする

#include "bits/stdc++.h"
using namespace std;
#ifdef _DEBUG
#include "dump.hpp"
#else
#define dump(...)
#endif
//#define int long long
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define all(c) begin(c),end(c)
const int INF = sizeof(int) == sizeof(long long) ? 0x3f3f3f3f3f3f3f3fLL : 0x3f3f3f3f;
const int MOD = 1'000'000'007;
template<class T> bool chmax(T &a, const T &b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, const T &b) { if (b < a) { a = b; return true; } return false; }
template<int MOD>
struct ModInt {
    static const int kMod = MOD;
    unsigned x;
    ModInt() :x(0) {}
    ModInt(signed x_) { x_ %= MOD; if (x_ < 0)x_ += MOD; x = x_; }
    ModInt(signed long long x_) { x_ %= MOD; if (x_ < 0)x_ += MOD; x = x_; }
    int get()const { return (int)x; }
    ModInt &operator+=(ModInt m) { if ((x += m.x) >= MOD)x -= MOD; return *this; }
    ModInt &operator-=(ModInt m) { if ((x += MOD - m.x) >= MOD)x -= MOD; return *this; }
    ModInt &operator*=(ModInt m) { x = (unsigned long long)x*m.x%MOD; return *this; }
    ModInt &operator/=(ModInt m) { return *this *= m.inverse(); }
    ModInt operator+(ModInt m)const { return ModInt(*this) += m; }
    ModInt operator-(ModInt m)const { return ModInt(*this) -= m; }
    ModInt operator*(ModInt m)const { return ModInt(*this) *= m; }
    ModInt operator/(ModInt m)const { return ModInt(*this) /= m; }
    ModInt operator-()const { return ModInt(kMod - x); }
    bool operator==(ModInt m)const { return x == m.x; }
    bool operator!=(ModInt m)const { return x != m.x; }
    ModInt inverse()const {
        signed a = x, b = MOD, u = 1, v = 0;
        while (b) {
            signed t = a / b;
            a -= t * b; swap(a, b);
            u -= t * v; swap(u, v);
        }
        if (u < 0)u += MOD;
        return ModInt(u);
    }
};
template<int MOD>
ostream &operator<<(ostream &os, const ModInt<MOD> &m) { return os << m.x; }
template<int MOD>
istream &operator>>(istream &is, ModInt<MOD> &m) { signed long long s; is >> s; m = ModInt<MOD>(s); return is; };
using mint = ModInt<MOD>;
template<int MOD>
ModInt<MOD> pow(ModInt<MOD> a, unsigned long long k) {
    ModInt<MOD> r = 1;
    while (k) {
        if (k & 1)r *= a;
        a *= a;
        k >>= 1;
    }
    return r;
}
// n < 10^7
// 前計算 O(n)
// 計算 O(1)
vector<mint> fact, factinv;
void precomputeFact(int n) {
    n = min(n, mint::kMod - 1); //  N >= kMod  =>  N! = 0 (mod kMod)
    fact.resize(n + 1); factinv.resize(n + 1);
    fact[0] = 1;
    for (int i = 1; i < n + 1; i++)
        fact[i] = fact[i - 1] * i;
    factinv[n] = fact[n].inverse();
    for (int i = n; i >= 1; i--)
        factinv[i - 1] = factinv[i] * i; // ((i-1)!)^(-1) = (i!)^(-1) * i
}
mint binom(int n, int r) {
    if (n >= mint::kMod)
        return binom(n % mint::kMod, r % mint::kMod) * binom(n / mint::kMod, r / mint::kMod);
    return r > n ? 0 : fact[n] * factinv[n - r] * factinv[r];
}
// スターリング数
vector<vector<mint>> stirlingNumbers(int n) {
    vector<vector<mint>> S(n + 1, vector<mint>(n + 1, 0));
    S[0][0] = 1;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= i; j++) {
            S[i + 1][j] += S[i][j] * j;
            S[i + 1][j + 1] += S[i][j];
        }
    }
    return S;
}
signed main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N, M; cin >> N >> M;
    vector<int> w(N); rep(i, 0, N) {
        cin >> w[i];
    }
    vector<int> I(M), J(M); rep(i, 0, M) {
        cin >> I[i] >> J[i];
        I[i]--, J[i]--;
    }
    vector<vector<int>> wf(N, vector<int>(N, 0));
    rep(i, 0, N)wf[i][i] = w[i];
    rep(i, 0, M) {
        int s = I[i], d = J[i];
        wf[s][d] = max(wf[s][d], w[s]); // 有向
    }
    rep(k, 0, N)rep(i, 0, N)rep(j, 0, N) {
        if (wf[i][k] != INF && wf[k][j] != INF)
            wf[i][j] = max(wf[i][j], min(wf[i][k], wf[k][j]));
    }
    dump(wf);
    int maxi = *max_element(all(w));
    precomputeFact(maxi);
    auto S = stirlingNumbers(maxi);
    mint ans = 0;
    rep(i, 0, N)rep(j, 0, N) {
        if (wf[i][j] >= w[j]) {
            mint s = fact[w[j]] * S[w[i]][w[j]];
            dump(i, j, s);
            ans += s;
        }
    }
    cout << ans << endl;
    return 0;
}
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