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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#500055#6956. Many Topological ProblemsinksamuraiAC ✓51ms3640kbC++231.6kb2024-07-31 21:37:152024-07-31 21:37:17

Judging History

你现在查看的是最新测评结果

  • [2024-07-31 21:37:17]
  • 评测
  • 测评结果:AC
  • 用时:51ms
  • 内存:3640kb
  • [2024-07-31 21:37:15]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int) a.size()
#define all(a) a.begin(),a.end()
#define vec(...) vector<__VA_ARGS__>
#define _3Wcdivh ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pii;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}

// snuke's mod int
template <ll mod>
struct modint{
	ll x;
	modint(ll x=0):x((x%mod+mod)%mod){}
	modint operator-()const{return modint(-x);}
	modint& operator+=(const modint a){if((x+=a.x)>=mod) x-=mod; return *this;}
	modint& operator-=(const modint a){if((x+=mod-a.x)>=mod) x-=mod; return *this;}
	modint& operator*=(const modint a){(x*=a.x)%=mod; return *this;}
	modint operator+(const modint a)const{modint res(*this); return res+=a;}
	modint operator-(const modint a)const{modint res(*this); return res-=a;}
	modint operator*(const modint a)const{modint res(*this); return res*=a;}
	modint pow(ll n)const{
		modint res=1,x(*this);
		while(n){
			if(n&1)res*=x;
			x*=x;
			n>>=1;
		}
		return res;
	}
	modint inv()const{return pow(mod-2);}
};

using mint=modint<1000000007>;

void slv(){
	int n,k;
	cin>>n>>k;

	mint ans=1;
	for(int i=2;i<=n;i++){
		ans*=mint(min(i-1,k));
	}
	for(int i=1;i<=n;i++){
		ans*=mint(i);
	}
	print(ans.x);
}

signed main(){
_3Wcdivh;
	int __t;
	cin>>__t;
	rep(cs,__t){
		slv();
	}
}

详细

Test #1:

score: 100
Accepted
time: 51ms
memory: 3640kb

input:

10
1 1
700503 623646
939811 584922
752155 569391
348265 116258
839298 839298
800391 216447
150847 116426
370812 168588
1000000 407619

output:

1 
972550684 
617838838 
561525568 
470024873 
910196299 
782371500 
133886363 
868118624 
262962652 

result:

ok 10 lines