QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #218635 | #6736. Alice and Bob | Berlin_Jacor | AC ✓ | 596ms | 81712kb | C++14 | 504b | 2023-10-18 16:05:11 | 2023-10-18 16:05:11 |
Judging History
answer
#include<bits/stdc++.h>
#define int long long
using namespace std;
const int mod = 998244353;
int a[10000005];
int qpow(int x,int p) {
int res=1;
while(p) {
if(p&1)res=res*x%mod;
x=x*x%mod;
p>>=1;
}
return res;
}
signed main() {
int n;
a[0]=1;
for(int i=1;i<=10000001;++i)a[i]=a[i-1]*i%mod;
cin>>n;
int ans=0;
for(int p=1;p<=n;++p) {
if(n-p>=p-1) {
ans = ( ans + a[n-p] * a[n-p] % mod * qpow(a[n-2*p+1],mod-2)%mod ) %mod;
}
else break;
}
cout<<ans;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 46ms
memory: 81596kb
input:
1
output:
1
result:
ok 1 number(s): "1"
Test #2:
score: 0
Accepted
time: 46ms
memory: 81480kb
input:
2
output:
1
result:
ok 1 number(s): "1"
Test #3:
score: 0
Accepted
time: 40ms
memory: 81508kb
input:
10
output:
997920
result:
ok 1 number(s): "997920"
Test #4:
score: 0
Accepted
time: 50ms
memory: 81492kb
input:
100
output:
188898954
result:
ok 1 number(s): "188898954"
Test #5:
score: 0
Accepted
time: 45ms
memory: 81480kb
input:
4
output:
10
result:
ok 1 number(s): "10"
Test #6:
score: 0
Accepted
time: 28ms
memory: 81496kb
input:
8
output:
12336
result:
ok 1 number(s): "12336"
Test #7:
score: 0
Accepted
time: 38ms
memory: 81476kb
input:
16
output:
373118483
result:
ok 1 number(s): "373118483"
Test #8:
score: 0
Accepted
time: 28ms
memory: 81712kb
input:
32
output:
314585464
result:
ok 1 number(s): "314585464"
Test #9:
score: 0
Accepted
time: 34ms
memory: 81496kb
input:
64
output:
627827331
result:
ok 1 number(s): "627827331"
Test #10:
score: 0
Accepted
time: 42ms
memory: 81488kb
input:
128
output:
828497685
result:
ok 1 number(s): "828497685"
Test #11:
score: 0
Accepted
time: 42ms
memory: 81472kb
input:
256
output:
65697890
result:
ok 1 number(s): "65697890"
Test #12:
score: 0
Accepted
time: 40ms
memory: 81560kb
input:
512
output:
854187619
result:
ok 1 number(s): "854187619"
Test #13:
score: 0
Accepted
time: 44ms
memory: 81476kb
input:
1024
output:
513823539
result:
ok 1 number(s): "513823539"
Test #14:
score: 0
Accepted
time: 121ms
memory: 81476kb
input:
1361956
output:
617368199
result:
ok 1 number(s): "617368199"
Test #15:
score: 0
Accepted
time: 450ms
memory: 81708kb
input:
7579013
output:
827172636
result:
ok 1 number(s): "827172636"
Test #16:
score: 0
Accepted
time: 486ms
memory: 81672kb
input:
8145517
output:
710624331
result:
ok 1 number(s): "710624331"
Test #17:
score: 0
Accepted
time: 391ms
memory: 81664kb
input:
6140463
output:
707600568
result:
ok 1 number(s): "707600568"
Test #18:
score: 0
Accepted
time: 235ms
memory: 81472kb
input:
3515281
output:
698302413
result:
ok 1 number(s): "698302413"
Test #19:
score: 0
Accepted
time: 437ms
memory: 81504kb
input:
6969586
output:
69470392
result:
ok 1 number(s): "69470392"
Test #20:
score: 0
Accepted
time: 200ms
memory: 81664kb
input:
2888636
output:
433579983
result:
ok 1 number(s): "433579983"
Test #21:
score: 0
Accepted
time: 596ms
memory: 81500kb
input:
9999998
output:
758172780
result:
ok 1 number(s): "758172780"
Test #22:
score: 0
Accepted
time: 590ms
memory: 81708kb
input:
9999999
output:
605195495
result:
ok 1 number(s): "605195495"
Test #23:
score: 0
Accepted
time: 590ms
memory: 81472kb
input:
10000000
output:
866813682
result:
ok 1 number(s): "866813682"