結果

問題 No.1081 和の和
ユーザー rokahikou1
提出日時 2020-06-19 21:40:30
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 3,686 bytes
コンパイル時間 914 ms
コンパイル使用メモリ 98,852 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-07-03 14:08:54
合計ジャッジ時間 1,273 ms
ジャッジサーバーID
(参考情報)
judge1 / judge2
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 <algorithm>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
using namespace std;
#define rep(i, n) for(int(i) = 0; (i) < (n); (i)++)
#define FOR(i, m, n) for(int(i) = (m); (i) < (n); (i)++)
#define All(v) (v).begin(), (v).end()
#define pb push_back
#define MP(a, b) make_pair((a), (b))
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
const int INF = 1 << 30;
const ll LINF = 1LL << 60;
const int MOD = 1e9 + 7;
template <uint_fast64_t MOD> class ModInt {
using u64 = uint_fast64_t;
public:
u64 val;
ModInt(const u64 x = 0) : val(x % MOD) {}
constexpr u64 &value() { return val; }
constexpr ModInt operator-() { return val ? MOD - val : 0; }
constexpr ModInt operator+(const ModInt &rhs) const {
return ModInt(*this) += rhs;
}
constexpr ModInt operator-(const ModInt &rhs) const {
return ModInt(*this) -= rhs;
}
constexpr ModInt operator*(const ModInt &rhs) const {
return ModInt(*this) *= rhs;
}
constexpr ModInt operator/(const ModInt &rhs) const {
return ModInt(*this) /= rhs;
}
constexpr ModInt &operator+=(const ModInt &rhs) {
val += rhs.val;
if(val >= MOD) {
val -= MOD;
}
return *this;
}
constexpr ModInt &operator-=(const ModInt &rhs) {
if(val < rhs.val) {
val += MOD;
}
val -= rhs.val;
return *this;
}
constexpr ModInt &operator*=(const ModInt &rhs) {
val = val * rhs.val % MOD;
return *this;
}
constexpr ModInt &operator/=(const ModInt &rhs) {
*this *= rhs.inv();
return *this;
}
constexpr bool operator==(const ModInt &rhs) { return this->a == rhs.a; }
constexpr bool operator!=(const ModInt &rhs) { return this->a != rhs.a; }
friend constexpr ostream &operator<<(ostream &os, const ModInt<MOD> &x) {
return os << x.val;
}
friend constexpr istream &operator>>(istream &is, ModInt<MOD> &x) {
return is >> x.val;
}
constexpr ModInt inv() const {
u64 x = val, y = MOD, u = 1, v = 0, t = 0;
while(y > 0) {
t = x / y;
x -= t * y;
swap(x, y);
u -= t * v;
swap(u, v);
}
return ModInt(u);
}
constexpr ModInt pow(int e) const {
u64 x = 1, p = val;
while(e > 0) {
if(e % 2 == 0) {
p = (p * p) % MOD;
e /= 2;
} else {
x = (x * p) % MOD;
e--;
}
}
return ModInt(x);
}
};
//nCk mod.p;1<=k<=n<=1e7,pfor ModInt
template <class T> struct BiCoefficient {
vector<T> fac, finv, inv;
BiCoefficient(const int MAX) : fac(MAX), finv(MAX), inv(MAX) {
fac[0] = fac[1] = 1;
finv[0] = finv[1] = 1;
inv[1] = 1;
for(int i = 2; i < MAX; i++) {
fac[i] = fac[i - 1] * i;
inv[i] = -inv[MOD % i] * (MOD / i);
finv[i] = finv[i - 1] * inv[i];
}
}
T comb(int n, int k) {
if(n < k)
return 0;
if(n < 0 || k < 0)
return 0;
return fac[n] * finv[k] * finv[n - k];
}
};
using mint = ModInt<MOD>;
int main() {
int N;
cin >> N;
vector<int> A(N);
rep(i, N) cin >> A[i];
BiCoefficient<mint> Bicoef(200);
mint res = 0;
rep(i, N) { res += Bicoef.comb(N - 1, i) * mint(A[i]); }
cout << res << endl;
return 0;
}
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