結果
問題 |
No.1035 Color Box
|
ユーザー |
![]() |
提出日時 | 2020-08-09 14:10:57 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 15 ms / 2,000 ms |
コード長 | 4,305 bytes |
コンパイル時間 | 2,758 ms |
コンパイル使用メモリ | 197,440 KB |
最終ジャッジ日時 | 2025-01-12 19:21:26 |
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 36 |
ソースコード
#define PROBLEM "https://yukicoder.me/problems/2772" #include<bits/stdc++.h> using namespace std; #define call_from_test #ifndef call_from_test #include <bits/stdc++.h> using namespace std; #endif //BEGIN CUT HERE template<typename T,T MOD = 1000000007> struct Mint{ static constexpr T mod = MOD; T v; Mint():v(0){} Mint(signed v):v(v){} Mint(long long t){v=t%MOD;if(v<0) v+=MOD;} Mint pow(long long k){ Mint res(1),tmp(v); while(k){ if(k&1) res*=tmp; tmp*=tmp; k>>=1; } return res; } static Mint add_identity(){return Mint(0);} static Mint mul_identity(){return Mint(1);} Mint inv(){return pow(MOD-2);} Mint& operator+=(Mint a){v+=a.v;if(v>=MOD)v-=MOD;return *this;} Mint& operator-=(Mint a){v+=MOD-a.v;if(v>=MOD)v-=MOD;return *this;} Mint& operator*=(Mint a){v=1LL*v*a.v%MOD;return *this;} Mint& operator/=(Mint a){return (*this)*=a.inv();} Mint operator+(Mint a) const{return Mint(v)+=a;} Mint operator-(Mint a) const{return Mint(v)-=a;} Mint operator*(Mint a) const{return Mint(v)*=a;} Mint operator/(Mint a) const{return Mint(v)/=a;} Mint operator-() const{return v?Mint(MOD-v):Mint(v);} bool operator==(const Mint a)const{return v==a.v;} bool operator!=(const Mint a)const{return v!=a.v;} bool operator <(const Mint a)const{return v <a.v;} static Mint comb(long long n,int k){ Mint num(1),dom(1); for(int i=0;i<k;i++){ num*=Mint(n-i); dom*=Mint(i+1); } return num/dom; } }; template<typename T,T MOD> constexpr T Mint<T, MOD>::mod; template<typename T,T MOD> ostream& operator<<(ostream &os,Mint<T, MOD> m){os<<m.v;return os;} //END CUT HERE #ifndef call_from_test //INSERT ABOVE HERE signed ABC127_E(){ cin.tie(0); ios::sync_with_stdio(0); int h,w,k; cin>>h>>w>>k; using M = Mint<int>; M ans{0}; for(int d=1;d<h;d++) ans+=M(d)*M(h-d)*M(w)*M(w); for(int d=1;d<w;d++) ans+=M(d)*M(w-d)*M(h)*M(h); ans*=M::comb(h*w-2,k-2); cout<<ans<<endl; return 0; } /* verified on 2019/06/12 https://atcoder.jp/contests/abc127/tasks/abc127_e */ signed main(){ //ABC127_E(); return 0; } #endif #ifndef call_from_test #include <bits/stdc++.h> using namespace std; #endif //BEGIN CUT HERE template<typename M_> class Enumeration{ using M = M_; protected: static vector<M> fact,finv,invs; public: static void init(int n){ n=min<decltype(M::mod)>(n,M::mod-1); int m=fact.size(); if(n<m) return; fact.resize(n+1,1); finv.resize(n+1,1); invs.resize(n+1,1); if(m==0) m=1; for(int i=m;i<=n;i++) fact[i]=fact[i-1]*M(i); finv[n]=M(1)/fact[n]; for(int i=n;i>=m;i--) finv[i-1]=finv[i]*M(i); for(int i=m;i<=n;i++) invs[i]=finv[i]*fact[i-1]; } static M Fact(int n){ init(n); return fact[n]; } static M Finv(int n){ init(n); return finv[n]; } static M Invs(int n){ init(n); return invs[n]; } static M C(int n,int k){ if(n<k||k<0) return M(0); init(n); return fact[n]*finv[n-k]*finv[k]; } static M P(int n,int k){ if(n<k||k<0) return M(0); init(n); return fact[n]*finv[n-k]; } // put n identical balls into k distinct boxes static M H(int n,int k){ if(n<0||k<0) return M(0); if(!n&&!k) return M(1); init(n+k); return C(n+k-1,n); } }; template<typename M> vector<M> Enumeration<M>::fact=vector<M>(); template<typename M> vector<M> Enumeration<M>::finv=vector<M>(); template<typename M> vector<M> Enumeration<M>::invs=vector<M>(); //END CUT HERE #ifndef call_from_test //INSERT ABOVE HERE signed main(){ return 0; } #endif #ifndef call_from_test #include <bits/stdc++.h> using namespace std; #define call_from_test #include "enumeration.cpp" #undef call_from_test #endif //BEGIN CUT HERE // put n distinct balls into k distinct boxes template<typename M> M surjection(int n,int k){ using E = Enumeration<M>; E::init(k); M res(0); for(int i=1;i<=k;i++){ M tmp=E::C(k,i)*M(i).pow(n); if((k-i)&1) res-=tmp; else res+=tmp; } return res; } //END CUT HERE #ifndef call_from_test signed main(){ return 0; } #endif #undef call_from_test signed main(){ cin.tie(0); ios::sync_with_stdio(0); int n,m; cin>>n>>m; using M = Mint<int>; cout<<surjection<M>(n,m)<<endl; return 0; }