結果

問題 No.1035 Color Box
ユーザー 👑 CleyLCleyL
提出日時 2024-01-20 02:51:44
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 54 ms / 2,000 ms
コード長 3,685 bytes
コンパイル時間 1,084 ms
コンパイル使用メモリ 124,104 KB
最終ジャッジ日時 2025-02-18 21:45:45
ジャッジサーバーID
(参考情報)
judge4 / judge4
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 * 2
other AC * 36
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

//yukicoder@cpp17
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <cctype>
#include <climits>
#include <cassert>
#include <string>
#include <vector>
#include <set>
#include <stack>
#include <queue>
#include <map>
#include <random>
#include <bitset>
#include <complex>
#include <utility>
#include <numeric>
#include <functional>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
const ll MOD = 998244353;
const ll MODx = 1000000007;
const int INF = (1<<30)-1;
const ll LINF = (1LL<<62LL)-1;
const double EPS = (1e-10);
P ar4[4] = {{0,1},{0,-1},{1,0},{-1,0}};
P ar8[8] = {{-1,-1},{-1,0},{-1,1},{0,-1},{0,1},{1,-1},{1,0},{1,1}};
template <typename T> vector<T> make_vector(size_t a, T b) { return vector<T>(a, b); }
template <typename... Ts> auto make_vector(size_t a, Ts... ts) { return vector<decltype(make_vector(ts...))>(a, make_vector(ts...)); }
/*
cout << fixed << setprecision(n) << //n
min(max)_element(iter,iter)()
count(iter,iter,int)intiteriter
*/
/*
function corner below
*/
/*
Function corner above
*/
/* comment outed because can cause bugs
__attribute__((constructor))
void initial() {
cin.tie(0);
ios::sync_with_stdio(false);
}
*/
template <int mod>
struct ModInt{
int n;
ModInt():n(0){}
ModInt(long long n_):n(n_ >= 0 ? n_%mod : mod - ((-n_)%mod) ){}
ModInt(int n_):n(n_ >= 0 ? n_%mod : mod - ((-n_)%mod) ){}
ModInt &operator+=(const ModInt &p){
if((n+=p.n) >= mod)n-=mod;
return *this;
}
ModInt &operator-=(const ModInt &p){
n+=mod-p.n;
if(n >= mod)n-=mod;
return *this;
}
ModInt &operator*=(const ModInt &p){
n = (int) ((1LL*n*p.n)%mod);
return *this;
}
ModInt &operator/=(const ModInt &p){
*this *= p.inverse();
return *this;
}
ModInt operator-() const {return ModInt(-n);}
ModInt operator+(const ModInt &p) const {return ModInt(*this) += p;}
ModInt operator-(const ModInt &p) const {return ModInt(*this) -= p;}
ModInt operator*(const ModInt &p) const {return ModInt(*this) *= p;}
ModInt operator/(const ModInt &p) const {return ModInt(*this) /= p;}
bool operator==(const ModInt &p) const {return n==p.n;}
bool operator<(const ModInt &p) const {return n<p.n;}
bool operator>(const ModInt &p) const {return n>p.n;}
bool operator>=(const ModInt &p) const {return n>=p.n;}
bool operator<=(const ModInt &p) const {return n<=p.n;}
bool operator!=(const ModInt &p) const {return n!=p.n;}
ModInt inverse() const {
int a = n,b = mod,u = 1,v = 0;
while(b){
int t = a/b;
a -= t*b; swap(a,b);
u -= t*v; swap(u,v);
}
return ModInt(u);
}
ModInt pow(int64_t z) const {
ModInt ret(1),mul(n);
while(z > 0){
if(z & 1) ret *= mul;
mul *= mul;
z >>= 1;
}
return ret;
}
friend ostream &operator<<(ostream &os, const ModInt &p){
return os << p.n;
}
friend istream &operator>>(istream &is, ModInt &a){
int64_t t;
is >> t;
a = ModInt<mod> ((long long)t);
return (is);
}
};
using mint = ModInt<MODx>;
mint kaijo[100010];
int main(){
int n,m;cin>>n>>m;
kaijo[0] = 1;
for(int i = 1; n >= i; i++){
kaijo[i] = kaijo[i-1]*i;
}
mint ans = 0;
for(int i = 0; m >= i; i++){
if((m-i)%2 == 0){
ans += kaijo[m]/kaijo[m-i]/kaijo[i]*((mint)i).pow(n);
}else{
ans -= kaijo[m]/kaijo[m-i]/kaijo[i]*((mint)i).pow(n);
}
}
cout << ans << endl;
return 0;
}
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