結果

問題 No.2058 Binary String
コンテスト
ユーザー eQe
提出日時 2025-04-17 09:30:56
言語 C++23
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 19 ms / 2,000 ms
コード長 5,587 bytes
コンパイル時間 5,356 ms
コンパイル使用メモリ 334,428 KB
実行使用メモリ 7,844 KB
最終ジャッジ日時 2025-04-17 09:31:04
合計ジャッジ時間 6,930 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge5
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 * 23
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>
#include<atcoder/all>
using namespace std;
namespace my{
#define LL(...) ll __VA_ARGS__;lin(__VA_ARGS__)
#define jo(a,b) a##b
#define FO_IMPL(n,c) for(ll jo(_i,c)=n;jo(_i,c)-->0;)
#define FO(n) FO_IMPL(n,__COUNTER__)
#define FOR(i,...) for(auto[i,i##stop,i##step]=range(0,__VA_ARGS__);i<i##stop;i+=i##step)
#define fo(i,...) FO##__VA_OPT__(R)(i __VA_OPT__(,__VA_ARGS__))
#define of(i,...) for(auto[i,i##stop,i##step]=range(1,__VA_ARGS__);i>=i##stop;i+=i##step)
#define fe(a,e,...) for(auto&&__VA_OPT__([)e __VA_OPT__(,__VA_ARGS__]):a)
#define schrodinger(p,c) (p?c:remove_cvref_t<decltype(c)>{})
#define base_operator(op,type) auto operator op(const type&v)const{auto copy=*this;return copy op##=v;}
#define single_testcase void solve();}int main(){my::io();my::solve();}namespace my{
#define use_ml998244353 using ml=atcoder::modint998244353;
void io(){cin.tie(nullptr)->sync_with_stdio(0);cout<<fixed<<setprecision(15);}
auto&operator>>(istream&i,atcoder::modint&x){int t;i>>t;x=t;return i;}
auto&operator<<(ostream&o,const atcoder::modint&x){return o<<(int)x.val();}
auto&operator>>(istream&i,atcoder::modint998244353&x){int t;i>>t;x=t;return i;}
auto&operator<<(ostream&o,const atcoder::modint998244353&x){return o<<(int)x.val();}
auto&operator>>(istream&i,atcoder::modint1000000007&x){int t;i>>t;x=t;return i;}
auto&operator<<(ostream&o,const atcoder::modint1000000007&x){return o<<(int)x.val();}
using ll=long long;
using ull=unsigned long long;
using lll=__int128_t;
using ulll=__uint128_t;
istream&operator>>(istream&i,ulll&x){ull t;i>>t;x=t;return i;}
ostream&operator<<(ostream&o,const ulll&x){return(x<10?o:o<<x/10)<<ll(x%10);}
istream&operator>>(istream&i,lll&x){ll t;i>>t;x=t;return i;}
ostream&operator<<(ostream&o,const lll&x){return o<<(x<0?"-":"")<<ulll(x>0?x:-x);}
constexpr auto range(ll s,ll b){ll a=0;if(s)swap(a,b);return array{a-s,b,1-s*2};}
constexpr auto range(ll s,ll a,ll b,ll c=1){return array{a-s,b,(1-s*2)*c};}
const string newline{char(10)};
const string space{char(32)};
constexpr auto pow(lll x,ll n){assert(n>=0);lll r=1;while(n)n&1?r*=x:r,x*=x,n>>=1;return r;}
auto mod(auto a,auto b){return(a%=b)<0?a+b:a;}

template<class...A>using pack_back_t=tuple_element_t<sizeof...(A)-1,tuple<A...>>;

template<class V>concept vectorial=is_base_of_v<vector<typename remove_cvref_t<V>::value_type>,remove_cvref_t<V>>;
template<class V>constexpr int rank(){if constexpr(vectorial<V>)return rank<typename V::value_type>()+1;else return 0;}
template<class T>struct core_t_helper{using core_t=T;};
template<vectorial V>struct core_t_helper<V>{using core_t=typename core_t_helper<typename V::value_type>::core_t;};
template<class T>using core_t=core_t_helper<T>::core_t;
template<class V>istream&operator>>(istream&i,vector<V>&v){fe(v,e)i>>e;return i;}
template<class V>ostream&operator<<(ostream&o,const vector<V>&v){ll n=v.size();fo(i,n)o<<v[i]<<schrodinger(i<n-1,vectorial<V>?newline:space);return o;}

template<class V>struct vec;
template<int rank,class T>struct hvec_helper{using type=vec<typename hvec_helper<rank-1,T>::type>;};
template<class T>struct hvec_helper<0,T>{using type=T;};
template<int rank,class T>using hvec=typename hvec_helper<rank,T>::type;

template<class V>struct vec:vector<V>{
  static constexpr int R=rank<vec<V>>();
  using C=core_t<V>;
  using vector<V>::vector;
  vec(const vector<V>&v){vector<V>::operator=(v);}
  vec(const auto&...a)requires(sizeof...(a)>=3){resizes(a...);}
  void resizes(const auto&...a){*this=make(a...);}
  static auto make(ll n,const auto&...a){if constexpr(sizeof...(a)==1)return vec<C>(n,array{a...}[0]);else return vec<decltype(make(a...))>(n,make(a...));}

  vec&operator^=(const vec&u){this->insert(this->end(),u.begin(),u.end());return*this;}
  vec&operator+=(const vec&u){vec&v=*this;assert(v.size()==u.size());fo(i,v.size())v[i]+=u[i];return v;}
  vec&operator-=(const vec&u){vec&v=*this;assert(v.size()==u.size());fo(i,v.size())v[i]-=u[i];return v;}
  vec&operator+=(const C&c){fe(*this,e)e+=c;return*this;}
  vec&operator*=(const C&c){fe(*this,e)e*=c;return*this;}
  base_operator(^,vec)
  base_operator(+,vec)
  base_operator(-,vec)
  base_operator(+,C);
  base_operator(*,C);

  vec&operator++(){fe(*this,e)++e;return*this;}
  vec&operator--(){fe(*this,e)--e;return*this;}

  ll size()const{return vector<V>::size();}
};
template<class...A>requires(sizeof...(A)>=2)vec(const A&...a)->vec<hvec<sizeof...(A)-2,pack_back_t<A...>>>;
vec(ll)->vec<ll>;

void lin(auto&...a){(cin>>...>>a);}

void pp(const auto&...a){ll n=sizeof...(a);((cout<<a<<schrodinger(--n>0,space)),...);cout<<newline;}

template<class T>concept modulary=requires(T t){t.mod();};

template<class T>struct factorial_linear{
  ll M;
  vec<T>fa,fa_inv;
  factorial_linear(ll M):M(M),fa(M+1){
    fa[0]=1;
    fo(i,1,M+1)fa[i]=fa[i-1]*i;

    if constexpr(modulary<T>){
      fa_inv.resize(M+1);
      fa_inv.back()=fa.back().inv();
      of(i,M)fa_inv[i]=fa_inv[i+1]*(i+1);
    }
  }

  T operator()(ll n)const{assert(n<=M);return fa[n];}
  T inv(ll n)const{assert(n<=M);return fa_inv[n];}
};

template<class T>struct combination{
  ll M;
  factorial_linear<T>fa;
  combination(ll M):M(M),fa(M){}

  inline T operator()(ll n,ll k)const{return c(n,k);}
  T c(ll n,ll k)const{
    if(n<0||k<0||n<k)return 0;
    if constexpr(modulary<T>)return fa(n)*fa.inv(k)*fa.inv(n-k);
    else return fa(n)/fa(k)/fa(n-k);
  }
  T p(ll n,ll k)const{return c(n,k)*fa(k);}
};

single_testcase
void solve(){
  use_ml998244353
  LL(N,K);

  combination<ml>comb(N);
  ml ans=0;
  fo(i,N)ans+=ml(i).pow(K)*comb(N-1,i);
  pp(ans);
}}
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