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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 |
---|---|---|---|---|---|---|---|---|---|
#352808 | #6736. Alice and Bob | monster7000 | TL | 6ms | 3700kb | C++20 | 650b | 2024-03-13 16:59:21 | 2024-03-13 16:59:21 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define int long long
int mod=998244353;
int qmi(int a,int b)
{
int res=1;
a%=mod;
while(b)
{
if(b&1)res=(res*a)%mod;
b>>=1;
a=(a*a)%mod;
}
return res%mod;
}
int a(int n,int m)
{
int aa=1;
for(int i=n;m>=1;i--,m--)
{
aa=aa%mod*i%mod;
aa=(aa+mod)%mod;
}
// cout<<"aa:"<<aa<<endl;
return (aa+mod)%mod;
}
signed main()
{
int n;
cin>>n;
int ans=0;
for(int i=1;i*2<=n+1;i++)
{
int tt=a(n-i,i-1)%mod*a(n-i,n-i)%mod;
tt=(tt+mod)%mod;
// cout<<"i:"<<tt<<endl;
ans=(ans+tt)%mod;
ans=(ans+mod)%mod;
}
cout<<(ans+mod)%mod<<endl;;
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 3612kb
input:
1
output:
1
result:
ok 1 number(s): "1"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3544kb
input:
2
output:
1
result:
ok 1 number(s): "1"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3608kb
input:
10
output:
997920
result:
ok 1 number(s): "997920"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3700kb
input:
100
output:
188898954
result:
ok 1 number(s): "188898954"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3664kb
input:
4
output:
10
result:
ok 1 number(s): "10"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3544kb
input:
8
output:
12336
result:
ok 1 number(s): "12336"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3620kb
input:
16
output:
373118483
result:
ok 1 number(s): "373118483"
Test #8:
score: 0
Accepted
time: 0ms
memory: 3628kb
input:
32
output:
314585464
result:
ok 1 number(s): "314585464"
Test #9:
score: 0
Accepted
time: 1ms
memory: 3492kb
input:
64
output:
627827331
result:
ok 1 number(s): "627827331"
Test #10:
score: 0
Accepted
time: 1ms
memory: 3496kb
input:
128
output:
828497685
result:
ok 1 number(s): "828497685"
Test #11:
score: 0
Accepted
time: 1ms
memory: 3520kb
input:
256
output:
65697890
result:
ok 1 number(s): "65697890"
Test #12:
score: 0
Accepted
time: 3ms
memory: 3608kb
input:
512
output:
854187619
result:
ok 1 number(s): "854187619"
Test #13:
score: 0
Accepted
time: 6ms
memory: 3604kb
input:
1024
output:
513823539
result:
ok 1 number(s): "513823539"
Test #14:
score: -100
Time Limit Exceeded
input:
1361956