#605007 (C++17) No.1336 Union on Blackboard

• 問題: No.1336 Union on Blackboard
• ユーザー: otera
• 提出日時: 2021-01-16 04:50:27
• 言語: C++17 (gcc 12.3.0 + boost 1.83.0)
• 結果: AC
• 実行時間: 6 ms / 2,000 ms
• コード長: 4,336 bytes
• コンパイル時間: 2,050 ms
• コンパイル使用メモリ: 204,184 KB
• 実行使用メモリ: 5,376 KB
• 最終ジャッジ日時: 2024-05-05 08:16:20
• 合計ジャッジ時間: 3,411 ms
• ジャッジサーバーID （参考情報）: judge1 / judge2

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	2 ms; 5,248 KB
testcase_01	AC	3 ms; 5,376 KB
testcase_02	AC	3 ms; 5,376 KB
testcase_03	AC	4 ms; 5,376 KB
testcase_04	AC	3 ms; 5,376 KB
testcase_05	AC	3 ms; 5,376 KB
testcase_06	AC	3 ms; 5,376 KB
testcase_07	AC	3 ms; 5,376 KB
testcase_08	AC	3 ms; 5,376 KB
testcase_09	AC	3 ms; 5,376 KB
testcase_10	AC	5 ms; 5,376 KB
testcase_11	AC	5 ms; 5,376 KB
testcase_12	AC	5 ms; 5,376 KB
testcase_13	AC	5 ms; 5,376 KB
testcase_14	AC	5 ms; 5,376 KB
testcase_15	AC	5 ms; 5,376 KB
testcase_16	AC	5 ms; 5,376 KB
testcase_17	AC	5 ms; 5,376 KB
testcase_18	AC	5 ms; 5,376 KB
testcase_19	AC	5 ms; 5,376 KB
testcase_20	AC	5 ms; 5,376 KB
testcase_21	AC	5 ms; 5,376 KB
testcase_22	AC	5 ms; 5,376 KB
testcase_23	AC	5 ms; 5,376 KB
testcase_24	AC	5 ms; 5,376 KB
testcase_25	AC	6 ms; 5,376 KB
testcase_26	AC	5 ms; 5,376 KB
testcase_27	AC	5 ms; 5,376 KB
testcase_28	AC	5 ms; 5,376 KB
testcase_29	AC	5 ms; 5,376 KB
testcase_30	AC	2 ms; 5,376 KB
testcase_31	AC	2 ms; 5,376 KB

ソースコード

/**
 *    author:  otera    
**/
#include<bits/stdc++.h>
using namespace std;

#define int long long
typedef long long ll;
typedef long double ld;
const int inf=1e9+7;
const ll INF=1LL<<60;
#define rep(i, n) for(int i = 0; i < n; ++ i)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
typedef pair<int, int> P;
typedef pair<ll, ll> LP;
#define fr first
#define sc second
#define all(c) c.begin(),c.end()
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

// modint: mod 計算を int を扱うように扱える構造体
template<int MOD> struct Fp {
    long long val;
    constexpr Fp(long long v = 0) noexcept : val(v % MOD) {
        if (val < 0) val += MOD;
    }
    constexpr int getmod() { return MOD; }
    constexpr Fp operator - () const noexcept {
        return val ? MOD - val : 0;
    }
    constexpr Fp operator + (const Fp& r) const noexcept { return Fp(*this) += r; }
    constexpr Fp operator - (const Fp& r) const noexcept { return Fp(*this) -= r; }
    constexpr Fp operator * (const Fp& r) const noexcept { return Fp(*this) *= r; }
    constexpr Fp operator / (const Fp& r) const noexcept { return Fp(*this) /= r; }
    constexpr Fp& operator += (const Fp& r) noexcept {
        val += r.val;
        if (val >= MOD) val -= MOD;
        return *this;
    }
    constexpr Fp& operator -= (const Fp& r) noexcept {
        val -= r.val;
        if (val < 0) val += MOD;
        return *this;
    }
    constexpr Fp& operator *= (const Fp& r) noexcept {
        val = val * r.val % MOD;
        return *this;
    }
    constexpr Fp& operator /= (const Fp& r) noexcept {
        long long a = r.val, b = MOD, u = 1, v = 0;
        while (b) {
            long long t = a / b;
            a -= t * b; swap(a, b);
            u -= t * v; swap(u, v);
        }
        val = val * u % MOD;
        if (val < 0) val += MOD;
        return *this;
    }
    constexpr bool operator == (const Fp& r) const noexcept {
        return this->val == r.val;
    }
    constexpr bool operator != (const Fp& r) const noexcept {
        return this->val != r.val;
    }
    friend constexpr ostream& operator << (ostream &os, const Fp<MOD>& x) noexcept {
        return os << x.val;
    }
    friend constexpr istream& operator >> (istream &is, Fp<MOD>& x) noexcept {
        return is >> x.val;
    }
    friend constexpr Fp<MOD> modpow(const Fp<MOD> &a, long long n) noexcept {
        if (n == 0) return 1;
        auto t = modpow(a, n / 2);
        t = t * t;
        if (n & 1) t = t * a;
        return t;
    }
};

// 二項係数ライブラリ
template<class T> struct BiCoef {
    vector<T> fact_, inv_, finv_;
    constexpr BiCoef() {}
    constexpr BiCoef(int n) noexcept : fact_(n, 1), inv_(n, 1), finv_(n, 1) {
        init(n);
    }
    constexpr void init(int n) noexcept {
        fact_.assign(n, 1), inv_.assign(n, 1), finv_.assign(n, 1);
        int MOD = fact_[0].getmod();
        for(int i = 2; i < n; i++){
            fact_[i] = fact_[i-1] * i;
            inv_[i] = -inv_[MOD%i] * (MOD/i);
            finv_[i] = finv_[i-1] * inv_[i];
        }
    }
    constexpr T com(int n, int k) const noexcept {
        if (n < k || n < 0 || k < 0) return 0;
        return fact_[n] * finv_[k] * finv_[n-k];
    }
    constexpr T fact(int n) const noexcept {
        if (n < 0) return 0;
        return fact_[n];
    }
    constexpr T inv(int n) const noexcept {
        if (n < 0) return 0;
        return inv_[n];
    }
    constexpr T finv(int n) const noexcept {
        if (n < 0) return 0;
        return finv_[n];
    }
};

const int MOD = 1000000007;
//const int MOD = 998244353;
using mint = Fp<MOD>;
BiCoef<mint> bc;

void solve() {
    int n; cin >> n;
    vector<int> a(n);
    rep(i, n) {
        cin >> a[i];
    }
    vector<mint> dp(n + 1, 0);
    rep(i, n) {
        for(int j = n; j >= 1; -- j) {
            dp[j + 1] += dp[j] * a[i]; 
        }
        dp[1] += a[i];
    }
    mint ans = 0;
    for(int j = 1; j <= n; ++ j) ans += dp[j];
    cout << ans << "\n";
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	//cout << fixed << setprecision(20);
	int t; cin >> t; rep(i, t)solve();
	// solve();
    return 0;
}