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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
#35778#1089. Biological Software UtilitiesFroggyguaAC ✓10ms11400kbC++17799b2022-06-19 11:10:332022-06-19 11:10:33

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2022-06-19 11:10:33]
  • 评测
  • 测评结果:AC
  • 用时:10ms
  • 内存:11400kb
  • [2022-06-19 11:10:33]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
#define N 1000010
const int mod=998244353; 
typedef long long ll;
int n,fac[N],ifac[N];
int qpow(int a,int b){
	int ans=1;
	while(b){
		if(b&1)ans=1LL*ans*a%mod;
		a=1LL*a*a%mod;
		b>>=1;
	}
	return ans;
}
void init(int n){
	fac[0]=1;
	for(int i=1;i<=n;++i){
		fac[i]=1LL*fac[i-1]*i%mod;
	}
	ifac[n]=qpow(fac[n],mod-2);
	for(int i=n-1;i>=0;--i){
		ifac[i]=1LL*ifac[i+1]*(i+1)%mod;
	}
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cin>>n;
	if(n&1){
		cout<<0<<'\n';
		return 0;
	}
	init(n);
	n>>=1;
	if(n==1){
		cout<<1<<'\n';
		return 0;
	}
	int ans=qpow(n,n-2);
	ans=1LL*ans*fac[n<<1]%mod;
	ans=1LL*ans*qpow(ifac[2],n)%mod*ifac[n]%mod;
	ans=1LL*ans*qpow(4,n-1)%mod;
	cout<<ans<<'\n';
	return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 3ms
memory: 3564kb

input:

1

output:

0

result:

ok 1 number(s): "0"

Test #2:

score: 0
Accepted
time: 2ms
memory: 5624kb

input:

2

output:

1

result:

ok 1 number(s): "1"

Test #3:

score: 0
Accepted
time: 2ms
memory: 3508kb

input:

3

output:

0

result:

ok 1 number(s): "0"

Test #4:

score: 0
Accepted
time: 3ms
memory: 5596kb

input:

4

output:

12

result:

ok 1 number(s): "12"

Test #5:

score: 0
Accepted
time: 0ms
memory: 5664kb

input:

7788

output:

178152092

result:

ok 1 number(s): "178152092"

Test #6:

score: 0
Accepted
time: 9ms
memory: 11380kb

input:

1000000

output:

178454094

result:

ok 1 number(s): "178454094"

Test #7:

score: 0
Accepted
time: 2ms
memory: 5600kb

input:

12346

output:

751958800

result:

ok 1 number(s): "751958800"

Test #8:

score: 0
Accepted
time: 10ms
memory: 11400kb

input:

999996

output:

690785929

result:

ok 1 number(s): "690785929"

Test #9:

score: 0
Accepted
time: 2ms
memory: 5620kb

input:

6

output:

720

result:

ok 1 number(s): "720"

Test #10:

score: 0
Accepted
time: 2ms
memory: 5640kb

input:

10

output:

30240000

result:

ok 1 number(s): "30240000"

Test #11:

score: 0
Accepted
time: 2ms
memory: 3656kb

input:

99

output:

0

result:

ok 1 number(s): "0"

Test #12:

score: 0
Accepted
time: 2ms
memory: 5692kb

input:

100

output:

934178078

result:

ok 1 number(s): "934178078"

Test #13:

score: 0
Accepted
time: 2ms
memory: 5640kb

input:

20

output:

245111072

result:

ok 1 number(s): "245111072"

Test #14:

score: 0
Accepted
time: 2ms
memory: 3548kb

input:

38745

output:

0

result:

ok 1 number(s): "0"

Test #15:

score: 0
Accepted
time: 2ms
memory: 5636kb

input:

3848

output:

928659530

result:

ok 1 number(s): "928659530"

Test #16:

score: 0
Accepted
time: 2ms
memory: 3564kb

input:

347835

output:

0

result:

ok 1 number(s): "0"

Test #17:

score: 0
Accepted
time: 5ms
memory: 10248kb

input:

234234

output:

745247398

result:

ok 1 number(s): "745247398"

Test #18:

score: 0
Accepted
time: 2ms
memory: 5764kb

input:

12

output:

818069491

result:

ok 1 number(s): "818069491"

Test #19:

score: 0
Accepted
time: 2ms
memory: 5724kb

input:

98

output:

648803799

result:

ok 1 number(s): "648803799"

Test #20:

score: 0
Accepted
time: 3ms
memory: 5704kb

input:

124

output:

159487965

result:

ok 1 number(s): "159487965"

Test #21:

score: 0
Accepted
time: 2ms
memory: 5700kb

input:

1024

output:

318674437

result:

ok 1 number(s): "318674437"

Test #22:

score: 0
Accepted
time: 8ms
memory: 10208kb

input:

524288

output:

495260023

result:

ok 1 number(s): "495260023"

Test #23:

score: 0
Accepted
time: 2ms
memory: 3620kb

input:

524289

output:

0

result:

ok 1 number(s): "0"

Test #24:

score: 0
Accepted
time: 2ms
memory: 3712kb

input:

999999

output:

0

result:

ok 1 number(s): "0"

Test #25:

score: 0
Accepted
time: 1ms
memory: 3572kb

input:

999997

output:

0

result:

ok 1 number(s): "0"