QOJ.ac

QOJ

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
#410456#6736. Alice and BobLiberty12619AC ✓116ms159948kbC++201.0kb2024-05-14 01:35:462024-05-14 01:35:46

Judging History

你现在查看的是最新测评结果

  • [2024-05-14 01:35:46]
  • 评测
  • 测评结果:AC
  • 用时:116ms
  • 内存:159948kb
  • [2024-05-14 01:35:46]
  • 提交

answer

#include <bits/stdc++.h>
#define x first
#define y second
#define int long long
using namespace std;
typedef pair<int,int> PII;
const int N = 1e7+10,mod = 998244353,INF=1e12;
int fact[N],infact[N];
int qmi(int a,int b)
{
    int res=1;
    while(b)
    {
        if(b&1) res=res*a%mod;
        a=a*a%mod;
        b>>=1;
    }
    return res;

}
void init()
{
    fact[0]=1;
    for(int i=1;i<N;i++)fact[i]=fact[i-1]*i%mod;
    infact[N-1]=qmi(fact[N-1],mod-2);
    for(int i=N-2;i>=0;i--) infact[i]=infact[i+1]*(i+1)%mod;
}
int C(int a,int b)
{
    if(a<b) return 0;
    return  fact[a]*infact[b]%mod*infact[a-b]%mod;
}

void solve()
{
    int n;
    cin>>n;
    int ans=0;
    for(int i=1;i<=n;i++)   ans+=C(n-i,i-1)*fact[i-1]%mod*fact[n-i]%mod;
    cout<<ans%mod;
}

signed main()
{
    int T=1;
    cin.tie(0)->sync_with_stdio(false);
    //cin>>T;
    init();
    while(T--)
    {
        solve();
    }

    return 0;
}
/*
7
5 1
1 5
1 2
1 3
1 4
1 6
1 7
 */

詳細信息

Test #1:

score: 100
Accepted
time: 78ms
memory: 159868kb

input:

1

output:

1

result:

ok 1 number(s): "1"

Test #2:

score: 0
Accepted
time: 82ms
memory: 159860kb

input:

2

output:

1

result:

ok 1 number(s): "1"

Test #3:

score: 0
Accepted
time: 79ms
memory: 159948kb

input:

10

output:

997920

result:

ok 1 number(s): "997920"

Test #4:

score: 0
Accepted
time: 86ms
memory: 159948kb

input:

100

output:

188898954

result:

ok 1 number(s): "188898954"

Test #5:

score: 0
Accepted
time: 73ms
memory: 159860kb

input:

4

output:

10

result:

ok 1 number(s): "10"

Test #6:

score: 0
Accepted
time: 87ms
memory: 159820kb

input:

8

output:

12336

result:

ok 1 number(s): "12336"

Test #7:

score: 0
Accepted
time: 75ms
memory: 159948kb

input:

16

output:

373118483

result:

ok 1 number(s): "373118483"

Test #8:

score: 0
Accepted
time: 78ms
memory: 159796kb

input:

32

output:

314585464

result:

ok 1 number(s): "314585464"

Test #9:

score: 0
Accepted
time: 87ms
memory: 159816kb

input:

64

output:

627827331

result:

ok 1 number(s): "627827331"

Test #10:

score: 0
Accepted
time: 94ms
memory: 159820kb

input:

128

output:

828497685

result:

ok 1 number(s): "828497685"

Test #11:

score: 0
Accepted
time: 85ms
memory: 159864kb

input:

256

output:

65697890

result:

ok 1 number(s): "65697890"

Test #12:

score: 0
Accepted
time: 95ms
memory: 159872kb

input:

512

output:

854187619

result:

ok 1 number(s): "854187619"

Test #13:

score: 0
Accepted
time: 87ms
memory: 159860kb

input:

1024

output:

513823539

result:

ok 1 number(s): "513823539"

Test #14:

score: 0
Accepted
time: 87ms
memory: 159864kb

input:

1361956

output:

617368199

result:

ok 1 number(s): "617368199"

Test #15:

score: 0
Accepted
time: 107ms
memory: 159872kb

input:

7579013

output:

827172636

result:

ok 1 number(s): "827172636"

Test #16:

score: 0
Accepted
time: 115ms
memory: 159880kb

input:

8145517

output:

710624331

result:

ok 1 number(s): "710624331"

Test #17:

score: 0
Accepted
time: 104ms
memory: 159816kb

input:

6140463

output:

707600568

result:

ok 1 number(s): "707600568"

Test #18:

score: 0
Accepted
time: 103ms
memory: 159800kb

input:

3515281

output:

698302413

result:

ok 1 number(s): "698302413"

Test #19:

score: 0
Accepted
time: 103ms
memory: 159792kb

input:

6969586

output:

69470392

result:

ok 1 number(s): "69470392"

Test #20:

score: 0
Accepted
time: 92ms
memory: 159872kb

input:

2888636

output:

433579983

result:

ok 1 number(s): "433579983"

Test #21:

score: 0
Accepted
time: 116ms
memory: 159816kb

input:

9999998

output:

758172780

result:

ok 1 number(s): "758172780"

Test #22:

score: 0
Accepted
time: 115ms
memory: 159800kb

input:

9999999

output:

605195495

result:

ok 1 number(s): "605195495"

Test #23:

score: 0
Accepted
time: 110ms
memory: 159792kb

input:

10000000

output:

866813682

result:

ok 1 number(s): "866813682"