結果

問題 No.1081 和の和
ユーザー FF256grhy
提出日時 2020-06-21 17:25:10
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 3 ms / 2,000 ms
コード長 4,206 bytes
コンパイル時間 2,798 ms
コンパイル使用メモリ 195,528 KB
最終ジャッジ日時 2025-01-11 09:00:29
ジャッジサーバーID
（参考情報） 		judge5 / 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 * 8
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;
using LL = long long int;
#define incID(i, l, r) for(int i = (l)    ; i <  (r); ++i)
#define decID(i, l, r) for(int i = (r) - 1; i >= (l); --i)
#define incII(i, l, r) for(int i = (l)    ; i <= (r); ++i)
#define decII(i, l, r) for(int i = (r)    ; i >= (l); --i)
#define inc(i, n)  incID(i, 0, n)
#define dec(i, n)  decID(i, 0, n)
#define inc1(i, n) incII(i, 1, n)
#define dec1(i, n) decII(i, 1, n)
#define inID(v, l, r) ((l) <= (v) && (v) <  (r))
#define inII(v, l, r) ((l) <= (v) && (v) <= (r))
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define MT make_tuple
#define FI first
#define SE second
#define FR front()
#define BA back()
#define ALL(v) v.begin(), v.end()
#define RALL(v) v.rbegin(), v.rend()
auto setmin   = [](auto & a, auto b) { return (b <  a ? a = b, true : false); };
auto setmax   = [](auto & a, auto b) { return (b >  a ? a = b, true : false); };
auto setmineq = [](auto & a, auto b) { return (b <= a ? a = b, true : false); };
auto setmaxeq = [](auto & a, auto b) { return (b >= a ? a = b, true : false); };
#define SI(v) static_cast<int>(v.size())
#define RF(e, v) for(auto & e: v)
#define until(e) while(! (e))
#define if_not(e) if(! (e))
#define ef else if
#define UR assert(false)
#define IN(T, ...) T __VA_ARGS__; IN_(__VA_ARGS__);
void IN_() { };
template<typename T, typename ... U> void IN_(T &  a, U &  ... b) { cin >> a; IN_(b ...); };
template<typename T                > void OUT(T && a            ) { cout << a << endl; }
template<typename T, typename ... U> void OUT(T && a, U && ... b) { cout << a << " "; OUT(b ...); }
// ---- ----
template<LL M> class ModInt {
private:
    LL v;
    pair<LL, LL> ext_gcd(LL a, LL b) {
        if(b == 0) { assert(a == 1); return { 1, 0 }; }
        auto p = ext_gcd(b, a % b);
        return { p.SE, p.FI - (a / b) * p.SE };
    }
public:
    ModInt(LL vv = 0) { v = vv; if(abs(v) >= M) { v %= M; } if(v < 0) { v += M; } }
    LL get_v() { return v; }
    ModInt inv() { return ext_gcd(M, v).SE; }
    ModInt exp(LL b) {
        ModInt p = 1, a = v; if(b < 0) { a = a.inv(); b = -b; }
        while(b) { if(b & 1) { p *= a; } a *= a; b >>= 1; }
        return p;
    }
    friend bool      operator< (ModInt    a, ModInt   b) { return (a.v <  b.v); }
    friend bool      operator> (ModInt    a, ModInt   b) { return (a.v >  b.v); }
    friend bool      operator<=(ModInt    a, ModInt   b) { return (a.v <= b.v); }
    friend bool      operator>=(ModInt    a, ModInt   b) { return (a.v >= b.v); }
    friend bool      operator==(ModInt    a, ModInt   b) { return (a.v == b.v); }
    friend bool      operator!=(ModInt    a, ModInt   b) { return (a.v != b.v); }
    friend ModInt    operator+ (ModInt    a            ) { return ModInt(+a.v); }
    friend ModInt    operator- (ModInt    a            ) { return ModInt(-a.v); }
    friend ModInt    operator+ (ModInt    a, ModInt   b) { return ModInt(a.v + b.v); }
    friend ModInt    operator- (ModInt    a, ModInt   b) { return ModInt(a.v - b.v); }
    friend ModInt    operator* (ModInt    a, ModInt   b) { return ModInt(a.v * b.v); }
    friend ModInt    operator/ (ModInt    a, ModInt   b) { return a * b.inv(); }
    friend ModInt    operator^ (ModInt    a, LL       b) { return a.exp(b); }
    friend ModInt  & operator+=(ModInt  & a, ModInt   b) { return (a = a + b); }
    friend ModInt  & operator-=(ModInt  & a, ModInt   b) { return (a = a - b); }
    friend ModInt  & operator*=(ModInt  & a, ModInt   b) { return (a = a * b); }
    friend ModInt  & operator/=(ModInt  & a, ModInt   b) { return (a = a / b); }
    friend ModInt  & operator^=(ModInt  & a, LL       b) { return (a = a ^ b); }
    friend istream & operator>>(istream & s, ModInt & b) { s >> b.v; b = ModInt(b.v); return s; }
    friend ostream & operator<<(ostream & s, ModInt   b) { return (s << b.v); }
};
// ----
using MI = ModInt<1'000'000'007>;
template<typename T> istream & operator>>(istream & s, vector<T> & v) { RF(e, v) { s >> e; } return s; }
template<typename T> ostream & operator<<(ostream & s, vector<T> const & v) {
    inc(i, SI(v)) { s << (i == 0 ? "" : " ") << v[i]; }
    return s;
}
int main() {
    IN(int, n);
    vector<int> a(n);
    cin >> a;
    
    MI ans = 0, c = 1;
    inc(i, n) {
        ans += a[i] * c;
        c *= n - 1 - i;
        c /= i + 1;
    }
    OUT(ans);
}
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