QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#474963 | #6736. Alice and Bob | szy10010 | WA | 483ms | 81824kb | C++17 | 1.5kb | 2024-07-13 09:53:26 | 2024-07-13 09:53:26 |
Judging History
answer
#include <map>
#include <queue>
#include <deque>
#include <cmath>
#include <vector>
#include <cstring>
#include <iostream>
#include <algorithm>
#include <unordered_map>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define pp pop_back()
#define int long long
#define lowbit(x) ((x)&(-x))
#define double long double
#define sf(x) scanf("%lld",&x)
#define sff(x,y) scanf("%lld %lld",&x,&y)
#define all(x) (x).begin(), (x).end()
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)
typedef unsigned long long ULL;
typedef pair<int,int>PII;
const int N=1e7+10,INF=4e18,P=998244353;
int n,m,cnt;
int A[N];
int qmi(int a,int b,int P)
{
int res=1;
while(b)
{
if(b&1)res=res*a%P;
a=a*a%P;
b>>=1;
}
return res;
}
void init()
{
int now=1,fnow=1;
for(int i=1;i<=10000000;i++)
{
now=now*i%P;
A[i]=now;
}
return;
}
//bool st[20];
//int cun[20];
//int cunres[20];
//void dfs(int ii)
//{
// if(ii==11)
// {
// for(int i=2;i<=cun[1];i++)
// {
// if(cun[i]<cun[1])return;
// }
// cunres[cun[1]]++;
// return ;
// }
// for(int i=1;i<=10;i++)
// {
// if(!st[i])
// {
// st[i]=true;
// cun[ii]=i;
// dfs(ii+1);
// st[i]=false;
// }
// }
//}
void solve()
{
cin>>n;
int res=0;
for(int i=1;i<=n;i++)
if(n-2*i+1>0)res=(res+A[n-i]*qmi(A[n-2*i+1],P-2,P)%P*A[n-i]%P)%P;
if(n==1)cout<<1<<endl;
else cout<<res<<endl;
return ;
}
signed main()
{
init();
IOS;
int T=1;
// cin>>T;
while(T--)
solve();
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 48ms
memory: 81676kb
input:
1
output:
1
result:
ok 1 number(s): "1"
Test #2:
score: 0
Accepted
time: 50ms
memory: 81632kb
input:
2
output:
1
result:
ok 1 number(s): "1"
Test #3:
score: 0
Accepted
time: 47ms
memory: 81748kb
input:
10
output:
997920
result:
ok 1 number(s): "997920"
Test #4:
score: 0
Accepted
time: 42ms
memory: 81676kb
input:
100
output:
188898954
result:
ok 1 number(s): "188898954"
Test #5:
score: 0
Accepted
time: 24ms
memory: 81696kb
input:
4
output:
10
result:
ok 1 number(s): "10"
Test #6:
score: 0
Accepted
time: 43ms
memory: 81748kb
input:
8
output:
12336
result:
ok 1 number(s): "12336"
Test #7:
score: 0
Accepted
time: 35ms
memory: 81752kb
input:
16
output:
373118483
result:
ok 1 number(s): "373118483"
Test #8:
score: 0
Accepted
time: 47ms
memory: 81744kb
input:
32
output:
314585464
result:
ok 1 number(s): "314585464"
Test #9:
score: 0
Accepted
time: 42ms
memory: 81824kb
input:
64
output:
627827331
result:
ok 1 number(s): "627827331"
Test #10:
score: 0
Accepted
time: 51ms
memory: 81764kb
input:
128
output:
828497685
result:
ok 1 number(s): "828497685"
Test #11:
score: 0
Accepted
time: 43ms
memory: 81732kb
input:
256
output:
65697890
result:
ok 1 number(s): "65697890"
Test #12:
score: 0
Accepted
time: 35ms
memory: 81700kb
input:
512
output:
854187619
result:
ok 1 number(s): "854187619"
Test #13:
score: 0
Accepted
time: 43ms
memory: 81728kb
input:
1024
output:
513823539
result:
ok 1 number(s): "513823539"
Test #14:
score: 0
Accepted
time: 121ms
memory: 81676kb
input:
1361956
output:
617368199
result:
ok 1 number(s): "617368199"
Test #15:
score: -100
Wrong Answer
time: 483ms
memory: 81664kb
input:
7579013
output:
693151411
result:
wrong answer 1st numbers differ - expected: '827172636', found: '693151411'