結果

問題 No.644 G L C C D M
ユーザー 👑 はまやんはまやんはまやんはまやん
提出日時 2018-02-04 20:47:25
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
TLE  
実行時間 -
コード長 4,112 bytes
コンパイル時間 1,503 ms
コンパイル使用メモリ 168,876 KB
実行使用メモリ 8,752 KB
最終ジャッジ日時 2023-09-12 16:07:02
合計ジャッジ時間 5,378 ms
ジャッジサーバーID
(参考情報)
judge15 / judge11
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 4 ms
4,508 KB
testcase_01 AC 3 ms
4,376 KB
testcase_02 AC 3 ms
4,376 KB
testcase_03 AC 3 ms
4,376 KB
testcase_04 AC 3 ms
4,376 KB
testcase_05 AC 4 ms
4,376 KB
testcase_06 AC 4 ms
4,376 KB
testcase_07 AC 3 ms
4,376 KB
testcase_08 AC 3 ms
4,376 KB
testcase_09 AC 4 ms
4,376 KB
testcase_10 AC 3 ms
4,380 KB
testcase_11 AC 59 ms
4,376 KB
testcase_12 AC 4 ms
4,376 KB
testcase_13 TLE -
testcase_14 -- -
testcase_15 -- -
testcase_16 -- -
testcase_17 -- -
testcase_18 -- -
testcase_19 -- -
testcase_20 -- -
testcase_21 -- -
testcase_22 -- -
testcase_23 -- -
testcase_24 -- -
testcase_25 -- -
testcase_26 -- -
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 #

#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;
}
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