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 |
|---|---|---|---|---|---|---|---|---|---|
| #409713 | #6736. Alice and Bob | lzx2017# | AC ✓ | 610ms | 81764kb | C++20 | 686b | 2024-05-12 16:26:21 | 2024-05-12 16:26:22 |
Judging History
answer
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<string>
#include<vector>
using namespace std;
typedef long long ll;
#define mod 998244353
ll a[10000005];
ll qmi(ll x,ll y){
ll ans=1;
while(y){
if(y&1)ans=ans*x%mod;
x=x*x%mod;
y/=2;
}
return ans;
}
ll A(ll x,ll y){
return a[x]*qmi(a[x-y],mod-2)%mod;
}
int main()
{
int n;
cin>>n;
long long temp=0;
a[0]=1;
for(int i=1;i<=n;i++){
a[i]=a[i-1]*i%mod;
}
//cout<<a[n]<<" "<<a[n-2]<<endl;
ll ans=0;
//cout<<"?"<<A(4,1)<<endl;
for(int i=1;i<=n;i++){
if(n-i>=i-1){
ans=ans+A(n-i,i-1)*a[n-i]%mod;
ans%=mod;
}
}
cout<<ans%mod<<endl;
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 3576kb
input:
1
output:
1
result:
ok 1 number(s): "1"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3440kb
input:
2
output:
1
result:
ok 1 number(s): "1"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3572kb
input:
10
output:
997920
result:
ok 1 number(s): "997920"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3588kb
input:
100
output:
188898954
result:
ok 1 number(s): "188898954"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3476kb
input:
4
output:
10
result:
ok 1 number(s): "10"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3568kb
input:
8
output:
12336
result:
ok 1 number(s): "12336"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3536kb
input:
16
output:
373118483
result:
ok 1 number(s): "373118483"
Test #8:
score: 0
Accepted
time: 1ms
memory: 3588kb
input:
32
output:
314585464
result:
ok 1 number(s): "314585464"
Test #9:
score: 0
Accepted
time: 0ms
memory: 3432kb
input:
64
output:
627827331
result:
ok 1 number(s): "627827331"
Test #10:
score: 0
Accepted
time: 0ms
memory: 3636kb
input:
128
output:
828497685
result:
ok 1 number(s): "828497685"
Test #11:
score: 0
Accepted
time: 0ms
memory: 3628kb
input:
256
output:
65697890
result:
ok 1 number(s): "65697890"
Test #12:
score: 0
Accepted
time: 0ms
memory: 3448kb
input:
512
output:
854187619
result:
ok 1 number(s): "854187619"
Test #13:
score: 0
Accepted
time: 1ms
memory: 3644kb
input:
1024
output:
513823539
result:
ok 1 number(s): "513823539"
Test #14:
score: 0
Accepted
time: 77ms
memory: 15252kb
input:
1361956
output:
617368199
result:
ok 1 number(s): "617368199"
Test #15:
score: 0
Accepted
time: 460ms
memory: 64652kb
input:
7579013
output:
827172636
result:
ok 1 number(s): "827172636"
Test #16:
score: 0
Accepted
time: 490ms
memory: 68824kb
input:
8145517
output:
710624331
result:
ok 1 number(s): "710624331"
Test #17:
score: 0
Accepted
time: 374ms
memory: 53160kb
input:
6140463
output:
707600568
result:
ok 1 number(s): "707600568"
Test #18:
score: 0
Accepted
time: 213ms
memory: 31000kb
input:
3515281
output:
698302413
result:
ok 1 number(s): "698302413"
Test #19:
score: 0
Accepted
time: 418ms
memory: 59288kb
input:
6969586
output:
69470392
result:
ok 1 number(s): "69470392"
Test #20:
score: 0
Accepted
time: 178ms
memory: 26272kb
input:
2888636
output:
433579983
result:
ok 1 number(s): "433579983"
Test #21:
score: 0
Accepted
time: 609ms
memory: 81604kb
input:
9999998
output:
758172780
result:
ok 1 number(s): "758172780"
Test #22:
score: 0
Accepted
time: 610ms
memory: 81764kb
input:
9999999
output:
605195495
result:
ok 1 number(s): "605195495"
Test #23:
score: 0
Accepted
time: 610ms
memory: 81676kb
input:
10000000
output:
866813682
result:
ok 1 number(s): "866813682"