結果
| 問題 |
No.1035 Color Box
|
| コンテスト | |
| ユーザー |
beet
|
| 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 |
(要ログイン)
| 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;
}
beet