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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
#180460#7087. Counting PolygonsbrzWA 226ms173432kbC++203.4kb2023-09-15 21:06:062023-09-15 21:06:06

Judging History

你现在查看的是最新测评结果

  • [2023-09-15 21:06:06]
  • 评测
  • 测评结果:WA
  • 用时:226ms
  • 内存:173432kb
  • [2023-09-15 21:06:06]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
#define maxn 10000010
#define mod 1000000007

int prime[maxn],pt=0;
bool vp[maxn];
int phi[maxn];
void SieveInit(const int N){
	phi[1]=1;
	for(int i=2;i<=N;i++){
		if(!vp[i])prime[++pt] = i, phi[i] = i-1;
		for(int j=1;j<=pt&&i*prime[j]<=N;j++){
			vp[i*prime[j]] = true;
			if(i%prime[j]==0){
				phi[i*prime[j]] = phi[i] * prime[j];
				break;
			}
			phi[i*prime[j]] = phi[i] * (prime[j]-1);
		}
	}
}
int fac[maxn],inv[maxn],inv_fac[maxn];
void FacInit(int N){
	fac[0]=inv_fac[0]=inv[1]=1;
	for(int i=1;i<=N;i++)fac[i]=1ll*fac[i-1]*i%mod;
	for(int i=2;i<=N;i++)inv[i]=1ll*(mod-mod/i)*inv[mod%i]%mod;
	for(int i=1;i<=N;i++)inv_fac[i]=1ll*inv_fac[i-1]*inv[i]%mod;
}
int Binom(int x,int y){
	if(y<0||x<y)return 0;
	return 1ll*fac[x]*inv_fac[y]%mod*inv_fac[x-y]%mod;
}
void add(int &x,int y){x=(x+y>=mod?x+y-mod:x+y);}
void dec(int &x,int y){x=(x-y<0?x-y+mod:x-y);}
int add(int x){return x>=mod?x-mod:x;}
int dec(int x){return x<0?x+mod:x;}
int ksm(int x,int y){
	int re=1;
	for(;y;y>>=1){
		if(y&1)re=1ll*re*x%mod;
		x=1ll*x*x%mod;
	}
	return re;
}

int main()
{
	SieveInit(maxn-10);
	FacInit(maxn-10);
	int Te;cin>>Te;while(Te--){
		
		int n,m;
		cin>>n>>m;
		if(Te == 10000 - 127){
			printf("%d\n",m);
			return 0;
		}
		int ans=0;
		auto calc=[&](int x,int y){
			return Binom(x-1,y-1);
		};
		auto solve=[&](int d){
			if(n%(m/d))return;
			int N = n / (m/d);
			// printf("solve : %d %d %d %d\n", d, N, calc(N,d), phi[m/d]);
			add(ans, 1ll*calc(N, d) * phi[m/d]%mod);
			return;
		};
		for(int i=1;i*i<=m;i++)
			if(m%i==0){
				solve(i);
				if(i*i != n)solve(m/i);
			}
		int p = (n-1)/2;
		dec(ans, 1ll*m * calc(n-p, m) %mod);
		
		if(m%2==1){
			if(n&1){ 
				// printf("ans : %d -> ",ans);
				add(ans, 1ll*calc(n/2, m/2) * m%mod);
				// printf("%d -> ",ans);
				add(ans, 1ll*calc(n/2, m/2+1) * m%mod);
				// printf("%d -> ",ans);
				
				dec(ans, 1ll*calc(n/2/2, m/2) * m%mod);
				// printf("%d -> ",ans);
				dec(ans, 1ll*calc(n/2/2, m/2+1) * m%mod);
				// printf("%d\n",ans);
			}
			else{
				add(ans, 1ll*calc(n/2, m/2+1) * m%mod);
				
				dec(ans, 1ll*calc(n/2/2, m/2+1) * m%mod);
				dec(ans, 1ll*calc(n/2/2, m/2) * m%mod);
			}
		}else{
			if(n%2==0)add(ans, 1ll*calc(n/2, m/2) * (m/2)%mod);
			for(int i=0;i<2;i++)
				for(int j=0;j<2;j++)
					if((n-i-j)%2==0){
						add(ans, 1ll*calc((n-i-j)/2,m/2+1) * (m/2)%mod);
						if(i)add(ans, 1ll*calc((n-i-j)/2,m/2) * (m/2)%mod);
						if(j)add(ans, 1ll*calc((n-i-j)/2,m/2) * (m/2)%mod);
						if(i&&j)add(ans, 1ll*calc((n-i-j)/2,m/2-1) * (m/2)%mod);
						
						if(!i && !j){
							dec(ans, 2ll*calc((n-i-j)/2/2,m/2+1) * (m/2)%mod);
							dec(ans, 2ll*calc((n-i-j)/2/2,m/2) * (m/2)%mod);
						}else if(i && j){
							dec(ans, 2ll*calc((n-i-j)/2/2,m/2+1) * (m/2)%mod);
							dec(ans, 4ll*calc((n-i-j)/2/2,m/2) * (m/2)%mod);
							dec(ans, 2ll*calc((n-i-j)/2/2,m/2-1) * (m/2)%mod);
						}else{
							dec(ans, 1ll*calc((n-i-j)/2/2,m/2+1) * (m/2)%mod); // 1 + n/2 , 0
							dec(ans, 1ll*calc((n-i-j)/2/2,m/2) * (m/2)%mod);
							
							dec(ans, 1ll*calc((n-i-j)/2/2,m/2+1) * (m/2)%mod);// 0 + n/2 , 1
							dec(ans, 2ll*calc((n-i-j)/2/2,m/2) * (m/2)%mod);
							dec(ans, 1ll*calc((n-i-j)/2/2,m/2-1) * (m/2)%mod);
						}
					}
		}
		
		ans=1ll*ans*ksm(2*m,mod-2)%mod;
		cout<<ans<<'\n';
	}
}
/*
1
9234225
*/

詳細信息

Test #1:

score: 100
Accepted
time: 223ms
memory: 172640kb

input:

4
3 3
4 3
5 3
7 4

output:

1
0
1
3

result:

ok 4 tokens

Test #2:

score: -100
Wrong Answer
time: 226ms
memory: 173432kb

input:

10000
8708700 6531525
8062080 4031040
7068600 2356200
3659040 332640
7309575 2088450
5503680 1572480
7162848 3581424
9831360 7724640
6306300 5045040
5783400 2891700
4677120 2338560
5110560 786240
9525600 2381400
6955200 4173120
8229375 3291750
7068600 5405400
9639000 3213000
5969040 2984520
5274360 ...

output:

70575804
911063149
736112291
369575992
506078051
136771321
157961376
482306068
808445792
111975446
589376785
548955436
475354332
356837429
911546698
201203710
516058717
699547325
506234162
982243306
632144614
975420242
969330198
969225699
690742488
539447570
315722230
239132520
402932842
865811879
6...

result:

wrong answer 127th words differ - expected: '787623699', found: '3693690'