結果
| 問題 |
No.2141 Enumeratest
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2024-08-09 18:37:51 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 34 ms / 2,000 ms |
| コード長 | 5,007 bytes |
| コンパイル時間 | 2,059 ms |
| コンパイル使用メモリ | 200,456 KB |
| 最終ジャッジ日時 | 2025-02-23 21:10:11 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 34 |
ソースコード
// (◕ᴗ◕✿)
// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define rep(i, n) for (ll i = 0; i < (n); i++)
#define srep(i, s, n) for (ll i = s; i < (n); i++)
#define len(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()
using namespace std;
template<typename T> using vc = vector<T>;
template<typename T> using vv = vc<vc<T>>;
template<typename T> using vvv = vv<vc<T>>;
using vi = vc<int>;using vvi = vv<int>; using vvvi = vv<vi>;
using ll = long long;using vl = vc<ll>;using vvl = vv<ll>; using vvvl = vv<vl>;
using ld = long double; using vld = vc<ld>; using vvld = vc<vld>; using vvvld = vc<vvld>;
using uint = unsigned int;
using ull = unsigned long long;
const ld pi = acos(-1.0);
const int inf = 0x3f3f3f3f;
const ll INF = 0x3f3f3f3f3f3f3f3f;
// const ll mod = 1000000007;
const ll mod = 998244353;
inline bool inside(ll y, ll x, ll H, ll W) {return 0 <= (y) and (y) < (H) and 0 <= (x) and (x) < (W); }
#define debug(var) do{std::cout << #var << " : \n";view(var);}while(0)
template<typename T> void view(T e){cout << e << endl;}
template<typename T> void view(const vc<T>& v){for(const auto& e : v){ cout << e << " "; } cout << endl;}
template<typename T> void view(const vv<T>& vv){ for(const auto& v : vv){ view(v); } }
struct modint {
int Mod = mod;
int val;
using mint = modint;
modint() {};
modint(ll v) {
if (0 <= v && v < Mod) val = v;
else{
v %= Mod;
if (v < 0) v += Mod;
val = v;
}
}
mint operator++(int){
val++;
if (val == Mod) val = 0;
return *this;
}
mint operator--(int){
if (val == 0) val = Mod;
val--;
return *this;
}
mint& operator+=(const mint& v){
val += v.val;
if (val >= Mod) val -= Mod;
return *this;
}
mint& operator-=(const mint& v){
val -= v.val;
if (val < 0) val += Mod;
return *this;
}
mint& operator*=(const mint& v){
val = (int)(1ll * val * v.val % Mod);
return *this;
}
modint inverse() const {
int a = val, b = mod, u = 1, v = 0, t;
while (b > 0) {
t = a / b;
swap(a -= t * b, b), swap(u -= t * v, v);
}
return modint(u);
}
mint pow(ll n) const {
mint a = *this, ret = 1;
while (n > 0){
if (n & 1) ret *= a;
a *= a;
n >>= 1;
}
return ret;
}
mint& operator>>=(ll k){
*this *= mint(2).pow(k).pow(Mod - 2);
return *this;
}
mint& operator<<=(ll k){
*this *= mint(2).pow(k);
return *this;
}
mint operator/=(const mint& v){
*this *= v.inverse();
return *this;
}
mint operator-() const { return mint(-val);}
friend mint operator+(const mint& u, const mint& v){return mint(u) += v;}
friend mint operator-(const mint& u, const mint& v){return mint(u) -= v;}
friend mint operator*(const mint& u, const mint& v){return mint(u) *= v;}
friend mint operator/(const mint& u, const mint& v){return mint(u) /= v;}
friend bool operator==(const mint& u, const mint& v){return u.val == v.val;}
friend bool operator!=(const mint& u, const mint& v){return u.val != v.val;}
friend bool operator>(const mint& u, const mint& v){return u.val > v.val;}
friend bool operator<(const mint& u, const mint& v){return u.val < v.val;}
friend mint operator>>(mint& u, const ll k){return u >>= k;}
friend mint operator<<(mint& u, const ll k){return u <<= k;}
friend ostream& operator<<(ostream& stream, mint& v){
stream << v.val;
return stream;
}
};
using mint = modint;
struct Binoms {
public :
Binoms(int n){
fact = vc<mint>(1, 1);
inv_fact = vc<mint>(1, 1);
update(n);
};
void update(int n){
if (sz >= n) return;
fact.resize(n + 1, 1);
inv_fact.resize(n + 1, 1);
for (int i = sz; i < n; i++) fact[i + 1] = fact[i] * (i + 1);
inv_fact[n] = 1 / fact[n];
for (int i = n - 1; i >= sz + 1; i--) inv_fact[i] = inv_fact[i + 1] * (i + 1);
sz = n;
return;
}
mint C(int n, int k){
if (n < k || k < 0) return 0;
if (sz < n) update(n);
return fact[n] * inv_fact[n - k] * inv_fact[k];
}
mint fac(int n){
if (sz < n) update(n);
return fact[n];
}
mint invfac(int n){
if (sz < n) update(n);
return inv_fact[n];
}
private :
int sz = 0;
vc<mint> fact, inv_fact;
};
int main(){
int N, M; cin >> N >> M;
Binoms B(1);
mint ans = B.fac(M);
int rest = M % N;
ans /= B.fac(M / N + 1).pow(rest);
ans /= B.fac(M / N).pow(N - rest);
cout << ans << endl;
}