結果
| 問題 |
No.8048 Order and Harmony
|
| コンテスト | |
| ユーザー |
risujiroh
|
| 提出日時 | 2019-04-01 23:06:12 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 126 ms / 2,000 ms |
| コード長 | 3,648 bytes |
| コンパイル時間 | 1,585 ms |
| コンパイル使用メモリ | 170,044 KB |
| 実行使用メモリ | 5,248 KB |
| 最終ジャッジ日時 | 2024-11-27 04:08:03 |
| 合計ジャッジ時間 | 4,689 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 61 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
using lint = long long;
template<class T = int> using V = vector<T>;
template<class T = int> using VV = V< V<T> >;
template<unsigned P> struct ModInt {
using M = ModInt;
unsigned v;
ModInt() : v(0) {}
template<class Z> ModInt(Z x) : v(x >= 0 ? x % P : (P - -x % P) % P) {}
constexpr ModInt(unsigned v, int) : v(v) {}
static constexpr unsigned p() { return P; }
M operator+() const { return *this; }
M operator-() const { return {v ? P - v : 0, 0}; }
explicit operator bool() const noexcept { return v; }
bool operator!() const noexcept { return !(bool) *this; }
M operator*(M r) const { return M(*this) *= r; }
M operator/(M r) const { return M(*this) /= r; }
M operator+(M r) const { return M(*this) += r; }
M operator-(M r) const { return M(*this) -= r; }
bool operator==(M r) const { return v == r.v; }
bool operator!=(M r) const { return !(*this == r); }
M& operator*=(M r) { v = (uint64_t) v * r.v % P; return *this; }
M& operator/=(M r) { return *this *= r.inv(); }
M& operator+=(M r) { if ((v += r.v) >= P) v -= P; return *this; }
M& operator-=(M r) { if ((v += P - r.v) >= P) v -= P; return *this; }
M inv() const {
int a = v, b = P, x = 1, u = 0;
while (b) {
int q = a / b;
swap(a -= q * b, b);
swap(x -= q * u, u);
}
assert(a == 1);
return x;
}
template<class Z> M pow(Z n) const {
if (n < 0) return pow(-n).inv();
M res = 1;
for (M a = *this; n; a *= a, n >>= 1) if (n & 1) res *= a;
return res;
}
template<class Z> friend M operator*(Z l, M r) { return M(l) *= r; }
template<class Z> friend M operator/(Z l, M r) { return M(l) /= r; }
template<class Z> friend M operator+(Z l, M r) { return M(l) += r; }
template<class Z> friend M operator-(Z l, M r) { return M(l) -= r; }
friend ostream& operator<<(ostream& os, M r) { return os << r.v; }
friend istream& operator>>(istream& is, M& r) { lint x; is >> x; r = x; return is; }
template<class Z> friend bool operator==(Z l, M r) { return M(l) == r; }
template<class Z> friend bool operator!=(Z l, M r) { return !(l == r); }
};
using Mint = ModInt<(unsigned) 1e9 + 7>;
V<Mint> tab{1, 682498929, 491101308, 76479948, 723816384, 67347853, 27368307, 625544428, 199888908, 888050723, 927880474, 281863274, 661224977, 623534362, 970055531, 261384175, 195888993, 66404266, 547665832, 109838563, 933245637, 724691727, 368925948, 268838846, 136026497, 112390913, 135498044, 217544623, 419363534, 500780548, 668123525, 128487469, 30977140, 522049725, 309058615, 386027524, 189239124, 148528617, 940567523, 917084264, 429277690, 996164327, 358655417, 568392357, 780072518, 462639908, 275105629, 909210595, 99199382, 703397904, 733333339, 97830135, 608823837, 256141983, 141827977, 696628828, 637939935, 811575797, 848924691, 131772368, 724464507, 272814771, 326159309, 456152084, 903466878, 92255682, 769795511, 373745190, 606241871, 825871994, 957939114, 435887178, 852304035, 663307737, 375297772, 217598709, 624148346, 671734977, 624500515, 748510389, 203191898, 423951674, 629786193, 672850561, 814362881, 823845496, 116667533, 256473217, 627655552, 245795606, 586445753, 172114298, 193781724, 778983779, 83868974, 315103615, 965785236, 492741665, 377329025, 847549272};
constexpr int N = 1e7;
Mint fact(int n) {
int i = n;
Mint res = 1;
while (i % N) {
res *= i--;
}
res *= tab[i / N];
return res;
}
int main() {
cin.tie(nullptr); ios::sync_with_stdio(false);
int n; cin >> n;
if (n & 1) {
cout << 0 << '\n';
} else {
auto res = fact(n) / fact(n / 2) / fact(n / 2);
cout << res << '\n';
}
}
risujiroh