結果
問題 | No.644 G L C C D M |
ユーザー | はまやんはまやん |
提出日時 | 2018-02-04 20:44:51 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 4,109 bytes |
コンパイル時間 | 1,636 ms |
コンパイル使用メモリ | 171,724 KB |
実行使用メモリ | 6,948 KB |
最終ジャッジ日時 | 2024-06-30 04:02:35 |
合計ジャッジ時間 | 2,468 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
(要ログイン)
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 | WA | - |
testcase_01 | WA | - |
testcase_02 | AC | 2 ms
6,944 KB |
testcase_03 | WA | - |
testcase_04 | AC | 2 ms
6,944 KB |
testcase_05 | WA | - |
testcase_06 | WA | - |
testcase_07 | WA | - |
testcase_08 | WA | - |
testcase_09 | WA | - |
testcase_10 | WA | - |
testcase_11 | WA | - |
testcase_12 | WA | - |
testcase_13 | WA | - |
testcase_14 | WA | - |
testcase_15 | WA | - |
testcase_16 | WA | - |
testcase_17 | AC | 2 ms
6,940 KB |
testcase_18 | AC | 3 ms
6,944 KB |
testcase_19 | AC | 2 ms
6,940 KB |
testcase_20 | AC | 2 ms
6,940 KB |
testcase_21 | AC | 2 ms
6,940 KB |
testcase_22 | WA | - |
testcase_23 | WA | - |
testcase_24 | WA | - |
testcase_25 | WA | - |
testcase_26 | WA | - |
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 (n % g || a % g) return 0; if (1 < g) return countGcd(n / g, a / g, 1); if (a == 1) return n; /*int res = 0; rep(i, 1, n + 1) if (gcd(i, a) == g) res++; return res;*/ return phi[a]; } //--------------------------------------------------------------------------------------------------- void _main() { 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; }