結果

問題 No.2351 Butterfly in Summer
ユーザー みしあ
提出日時 2023-07-27 16:00:07
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 5,416 bytes
コンパイル時間 3,315 ms
コンパイル使用メモリ 251,180 KB
最終ジャッジ日時 2025-02-15 19:33:21
ジャッジサーバーID
（参考情報） 		judge4 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 21
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 #
プレゼンテーションモードにする

#pragma region Macros
#include <bits/stdc++.h>
#include <atcoder/all>
#if defined(LOCAL) || defined(_DEBUG)
#include "debug.hpp"
#else
#define O(...)
#define START()
#define STOP()
#define MEMORY()
#endif
using namespace std;
#define REP(i, n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define REPR(i, n) for(int i=(n); i>=0; --i)
#define FOR(i, n, m) for(int i=(m), i##_len=(n); i<i##_len; ++i)
#define EACH(i, v) for(const auto& i : v)
#define ALL(x) (x).begin(),(x).end()
#define ALLR(x) (x).rbegin(),(x).rend()
template<class T, class U>bool chmax(T &a, const U &b) { if (a<(T)b) { a=(T)b; return 1; } return 0; }
template<class T, class U>bool chmin(T &a, const U &b) { if (b<(T)a) { a=(T)b; return 1; } return 0; }
#define vec vector
#define umap unordered_map
#define uset unordered_set
using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
using Tup = tuple<ll, ll, ll>;
using vl = vec<ll>;
#define fi first
#define se second
#define el endl
constexpr ll INF = numeric_limits<ll>::max()/2-1;
template<class T> istream &operator>>(istream &stream, vec<T>& o){REP(i, o.size())stream >> o[i];return stream;}
template<class T, class U> istream &operator>>(istream &stream, pair<T, U>& o){cin >> o.fi >> o.se; return stream;}
namespace myinput {
    void input() {}
    template<class T, class... Ts> void input(T&& o, Ts&&... args){cin >> o;input(forward<Ts>(args)...);}
    void assign_vl(size_t siz) {};
    template<class T, class... Ts> void assign_vl(size_t siz, T&& o, Ts&&... args){o.resize(siz);assign_vl(siz, forward<Ts>(args)...);}
    void input_horizon_sub(size_t index) {};
    template<class T, class... Ts> void input_horizon_sub(size_t index, T&& o, Ts&&... args) {cin>>o[index];input_horizon_sub(index, forward<Ts>(args
        )...);}
    template<class... Ts> void input_horizon(size_t siz, Ts&&... args){REP(i, siz) input_horizon_sub(i, forward<Ts>(args)...);}
}
#define _I(T, ...) ;myinput::input(__VA_ARGS__);
#define I(T, ...) ;T __VA_ARGS__;_I(T, __VA_ARGS__);
#define _Iv(T, siz, ...) ;myinput::assign_vl(siz, __VA_ARGS__);myinput::input(__VA_ARGS__);
#define Iv(T, siz, ...) ;vec<T> __VA_ARGS__;_Iv(T, siz, __VA_ARGS__);
#define _Ih(T, siz, ...) ;myinput::assign_vl(siz, __VA_ARGS__);myinput::input_horizon(siz, __VA_ARGS__);
#define Ih(T, siz, ...) ;vec<T> __VA_ARGS__;_Ih(T, siz, __VA_ARGS__);
#pragma endregion
void Main();
int main(){
    std::cin.tie(nullptr);
    std::cout << std::fixed << std::setprecision(15);
    Main();
    MEMORY();
    return 0;
}
// mod Pのための型
#pragma region modint
template<ll m> struct modint{
protected:
    ll v=0;
public:
    //コンストラクタ
    modint(ll x=0){while(x<0)x+=m;v=x%m;}
    modint(const modint &r){v=r.val();}
    //算術演算子(単項)
    modint operator -(){return modint(-v);} 
    modint& operator ++(){if(++v>=m)v-=m; return *this;}
    modint operator ++(int){modint t = *this; ++*this; return t;}
    modint& operator --(){if(--v<0)v+=m; return *this;}
    modint operator --(int){modint t = *this; --*this; return t;}
    //算術演算子(二項)
    friend modint operator +(const modint &l, const modint &r){return modint(l)+=r;}
    friend modint operator -(const modint &l, const modint &r){return modint(l)-=r;}
    friend modint operator *(const modint &l, const modint &r){return modint(l)*=r;}
    friend modint operator /(const modint &l, const modint &r){return modint(l)/=r;}
    // キャスト演算子
    explicit operator int() const {return val();}
    explicit operator ll() const {return val();}
    //代入演算子
    modint &operator +=(const modint &r){
        v+=r.val();
        if(v>=m)v-=m;
        return *this;
    }
    modint &operator -=(const modint &r){
        if(v<r.val())v+=m;
        v-=r.val();
        return *this;
    }
    modint &operator *=(const modint &r){
        v=v*r.val()%m;
        return *this;
    }
    modint &operator /=(const modint &r){
        v=v*r.inv().val()%m;
        return *this;
    }
    //等価比較演算子
    friend bool operator ==(const modint &l, const modint& r){return l.val()==r.val();}
    friend bool operator <(const modint &l, const modint& r){return l.val()<r.val();}
    friend bool operator >(const modint &l, const modint& r){return l.val()>r.val();}
    friend bool operator !=(const modint &l, const modint& r){return l.val()!=r.val();}
    // 各種関数
    int val() const{return v;}
    constexpr static ll mod(){return m;}
    static modint raw(ll x){modint r;r.v=x;return r;}
    modint inv() const{
        ll a=v,b=m,u=1,v=0;
        while(b){
            ll t=a/b;
            a-=t*b;swap(a,b);
            u-=t*v;swap(u,v);
        }
        u %= m; 
        if (u < 0) u += m;
        return u;
    }
    modint pow(ll n) const{
        modint ret = 1, x(v);
        while (n > 0) {
            if (n & 1) ret *= x;
            x *= x;
            n >>= 1;
        }
        return ret;
    }
    //入出力ストリーム
    friend istream &operator>>(istream &is,modint& x){ll t;is>>t;x=t;return (is);}
    friend ostream &operator<<(ostream &os,const modint& x){return os<<x.val();}
    
};
using modint1000000007 = modint<1000000007>;
using modint998244353 = modint<998244353>;
#pragma endregion
using mint = modint998244353;
void Main(){
    I(ll, n, k);
    mint x = (k * (k-1)) / 2;
    x *= n;
    x *= 2;
    mint y = mint(k).pow(n);
    O(x, y);
    cout << x/y << el;
}
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