結果
| 問題 | No.886 Direct |
| コンテスト | |
| ユーザー |
はまやんはまやん
|
| 提出日時 | 2019-09-14 09:15:53 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 192 ms / 4,000 ms |
| コード長 | 4,006 bytes |
| コンパイル時間 | 2,068 ms |
| コンパイル使用メモリ | 203,376 KB |
| 最終ジャッジ日時 | 2025-01-07 18:22:11 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 32 |
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; }
//---------------------------------------------------------------------------------------------------
vector<int> makePrimes(int n) { // [2,n]
vector<int> res, pr(n + 1, 1);
pr[0] = pr[1] = 0;
rep(p, 2, sqrt(n) + 2) if (pr[p]) for (int x = p * 2; x <= n; x += p) pr[x] = 0;
rep(p, 2, n + 1) if (pr[p]) res.push_back(p);
return res;
}
template<class T> vector<T> convolutionGcd(vector<T> a, vector<T> b) {
int na = a.size();
int nb = b.size();
int n = max(na, nb);
a.resize(n);
b.resize(n);
auto pr = makePrimes(n);
fore(p, pr) {
int m = (n - 1) / p;
rrep(i, m, 1) {
a[i] += a[i * p];
b[i] += b[i * p];
}
}
rep(i, 1, n) a[i] *= b[i];
fore(p, pr) {
int m = (n - 1) / p;
rep(i, 1, m+1) a[i] -= a[i * p];
}
return a;
}
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 @hamayanhamayan
/ \ | |
/ / ̄ ̄ ̄ ̄/ |
__(__ニつ/ _/ .| .|____
\/____/ (u ⊃
---------------------------------------------------------------------------------------------------*/
int H, W;
//---------------------------------------------------------------------------------------------------
void _main() {
cin >> H >> W;
vector<mint> h(H);
rep(i, 1, H) h[i] = H - i;
vector<mint> w(W);
rep(i, 1, W) w[i] = W - i;
auto v = convolutionGcd(h, w);
mint ans = v[1] * 2 + mint(H) * (W - 1) + mint(W) * (H - 1);
cout << ans << endl;
}
はまやんはまやん