結果
| 問題 |
No.644 G L C C D M
|
| コンテスト | |
| ユーザー |
はまやんはまやん
|
| 提出日時 | 2018-02-04 20:47:25 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 4,112 bytes |
| コンパイル時間 | 1,585 ms |
| コンパイル使用メモリ | 171,260 KB |
| 実行使用メモリ | 13,760 KB |
| 最終ジャッジ日時 | 2024-06-30 04:02:54 |
| 合計ジャッジ時間 | 5,065 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 13 TLE * 1 -- * 13 |
ソースコード
#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
//---------------------------------------------------------------------------------------------------
template<int MOD> struct ModInt {
static const int Mod = MOD; unsigned x; ModInt() : x(0) { }
ModInt(signed sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
ModInt(signed long long sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
int get() const { return (int)x; }
ModInt &operator+=(ModInt that) { if ((x += that.x) >= MOD) x -= MOD; return *this; }
ModInt &operator-=(ModInt that) { if ((x += MOD - that.x) >= MOD) x -= MOD; return *this; }
ModInt &operator*=(ModInt that) { x = (unsigned long long)x * that.x % MOD; return *this; }
ModInt &operator/=(ModInt that) { return *this *= that.inverse(); }
ModInt operator+(ModInt that) const { return ModInt(*this) += that; }
ModInt operator-(ModInt that) const { return ModInt(*this) -= that; }
ModInt operator*(ModInt that) const { return ModInt(*this) *= that; }
ModInt operator/(ModInt that) const { return ModInt(*this) /= that; }
ModInt inverse() const { long long a = x, b = MOD, u = 1, v = 0;
while (b) { long long t = a / b; a -= t * b; std::swap(a, b); u -= t * v; std::swap(u, v); }
return ModInt(u); }
bool operator==(ModInt that) const { return x == that.x; }
bool operator!=(ModInt that) const { return x != that.x; }
ModInt operator-() const { ModInt t; t.x = x == 0 ? 0 : Mod - x; return t; }
};
template<int MOD> ostream& operator<<(ostream& st, const ModInt<MOD> a) { st << a.get(); return st; };
template<int MOD> ModInt<MOD> operator^(ModInt<MOD> a, unsigned long long k) {
ModInt<MOD> r = 1; while (k) { if (k & 1) r *= a; a *= a; k >>= 1; } return r; }
typedef ModInt<1000000007> mint;
/*---------------------------------------------------------------------------------------------------
∧_∧
∧_∧ (´<_` ) Welcome to My Coding Space!
( ´_ゝ`) / ⌒i
/ \ | |
/ / ̄ ̄ ̄ ̄/ |
__(__ニつ/ _/ .| .|____
\/____/ (u ⊃
---------------------------------------------------------------------------------------------------*/
int N, M;
//---------------------------------------------------------------------------------------------------
vector<int> makePrimes(int n) {
vector<int> res, primes(n + 1, 1);
primes[0] = primes[1] = 0;
rep(i, 2, sqrt(n)) if (primes[i]) for (int j = 0; i * (j + 2) < n; j++) primes[i * (j + 2)] = 0;
rep(i, 2, n + 1) if (primes[i]) res.push_back(i);
return res;
}
int phi[101010];
void init() {
auto ep = makePrimes(101010);
rep(i, 0, 101010) phi[i] = i;
fore(p, ep) for (int x = p; x < 101010; x += p) phi[x] -= phi[x] / p;
}
int gcd(int a, int b) { return a ? gcd(b%a, a) : b; }
ll countGcd(int n, int a, int g) {
if (a % g) return 0;
if (1 < g) return countGcd(n / g, a / g, 1);
if (a == 1) return n;
//return phi[a];
int res = 0;
rep(i, 1, n + 1) if (gcd(i, a) == g) res++;
return res;
}
//---------------------------------------------------------------------------------------------------
void _main() {
init();
cin >> N >> M;
mint ans = 0;
mint cmb = 1;
rep(i, 1, N - 1) cmb = cmb * i;
rep(a1, 1, N + 1) {
mint a2cnt = countGcd(N, a1, M);
if (a1 == M) a2cnt = a2cnt - 1;
ans += a2cnt * cmb;
}
cout << ans << endl;
}
はまやんはまやん