QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #409089 | #6736. Alice and Bob | xunxxxx | AC ✓ | 690ms | 81772kb | C++23 | 570b | 2024-05-11 18:00:37 | 2024-05-11 18:00:37 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define p 998244353
#define int long long
int n,ans,a[10000010],l,r;
int ksm(int a,int b)
{
int res=1;
while(b)
{
if(b&1) res=res*a%p;
a=a*a%p;
b>>=1;
}
return res;
}
int C(int a1,int b1)
{
return a[a1]*ksm(a[b1]*a[a1-b1]%p,p-2)%p;
}
signed main()
{
cin>>n;
a[0]=a[1]=1;
for(int i=2;i<=10000000;i++) a[i]=a[i-1]*i%p;
for(int i=2;i<=n;i++)
{
l=i-1;
r=n-i;
if(r>=l) ans+=(a[n-1]-C(r,l)*a[l]%p*a[r]%p+p)%p;
else ans+=a[n-1];
ans%=p;
}
cout<<(a[n]-ans+p)%p<<"\n";
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 52ms
memory: 81668kb
input:
1
output:
1
result:
ok 1 number(s): "1"
Test #2:
score: 0
Accepted
time: 33ms
memory: 81684kb
input:
2
output:
1
result:
ok 1 number(s): "1"
Test #3:
score: 0
Accepted
time: 40ms
memory: 81768kb
input:
10
output:
997920
result:
ok 1 number(s): "997920"
Test #4:
score: 0
Accepted
time: 43ms
memory: 81696kb
input:
100
output:
188898954
result:
ok 1 number(s): "188898954"
Test #5:
score: 0
Accepted
time: 48ms
memory: 81656kb
input:
4
output:
10
result:
ok 1 number(s): "10"
Test #6:
score: 0
Accepted
time: 34ms
memory: 81700kb
input:
8
output:
12336
result:
ok 1 number(s): "12336"
Test #7:
score: 0
Accepted
time: 44ms
memory: 81752kb
input:
16
output:
373118483
result:
ok 1 number(s): "373118483"
Test #8:
score: 0
Accepted
time: 35ms
memory: 81612kb
input:
32
output:
314585464
result:
ok 1 number(s): "314585464"
Test #9:
score: 0
Accepted
time: 43ms
memory: 81764kb
input:
64
output:
627827331
result:
ok 1 number(s): "627827331"
Test #10:
score: 0
Accepted
time: 42ms
memory: 81708kb
input:
128
output:
828497685
result:
ok 1 number(s): "828497685"
Test #11:
score: 0
Accepted
time: 43ms
memory: 81764kb
input:
256
output:
65697890
result:
ok 1 number(s): "65697890"
Test #12:
score: 0
Accepted
time: 43ms
memory: 81684kb
input:
512
output:
854187619
result:
ok 1 number(s): "854187619"
Test #13:
score: 0
Accepted
time: 35ms
memory: 81768kb
input:
1024
output:
513823539
result:
ok 1 number(s): "513823539"
Test #14:
score: 0
Accepted
time: 129ms
memory: 81772kb
input:
1361956
output:
617368199
result:
ok 1 number(s): "617368199"
Test #15:
score: 0
Accepted
time: 520ms
memory: 81704kb
input:
7579013
output:
827172636
result:
ok 1 number(s): "827172636"
Test #16:
score: 0
Accepted
time: 560ms
memory: 81760kb
input:
8145517
output:
710624331
result:
ok 1 number(s): "710624331"
Test #17:
score: 0
Accepted
time: 433ms
memory: 81684kb
input:
6140463
output:
707600568
result:
ok 1 number(s): "707600568"
Test #18:
score: 0
Accepted
time: 266ms
memory: 81696kb
input:
3515281
output:
698302413
result:
ok 1 number(s): "698302413"
Test #19:
score: 0
Accepted
time: 494ms
memory: 81768kb
input:
6969586
output:
69470392
result:
ok 1 number(s): "69470392"
Test #20:
score: 0
Accepted
time: 223ms
memory: 81768kb
input:
2888636
output:
433579983
result:
ok 1 number(s): "433579983"
Test #21:
score: 0
Accepted
time: 690ms
memory: 81700kb
input:
9999998
output:
758172780
result:
ok 1 number(s): "758172780"
Test #22:
score: 0
Accepted
time: 679ms
memory: 81696kb
input:
9999999
output:
605195495
result:
ok 1 number(s): "605195495"
Test #23:
score: 0
Accepted
time: 680ms
memory: 81684kb
input:
10000000
output:
866813682
result:
ok 1 number(s): "866813682"