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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 |
---|---|---|---|---|---|---|---|---|---|
#276681 | #6736. Alice and Bob | ucup-team958# | AC ✓ | 121ms | 81812kb | C++14 | 685b | 2023-12-06 08:01:11 | 2023-12-06 08:01:11 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const int mod=998244353;
const int maxn=10000010;
int n,ans;
int fac[maxn],ifac[maxn];
int fpow(int n,int m,int x=1){
for(;m;m>>=1,n=1ll*n*n%mod)
if(m&1) x=1ll*x*n%mod;
return x;
}
int C(int n,int m){
if(n<0||m<0||n-m<0) return 0;
return 1ll*fac[n]*ifac[m]%mod*ifac[n-m]%mod;
}
void init(int n){
fac[0]=ifac[0]=1;
for(int i=1;i<=n;i++)
fac[i]=1ll*fac[i-1]*i%mod;
ifac[n]=fpow(fac[n],mod-2);
for(int i=n-1;i;i--)
ifac[i]=1ll*ifac[i+1]*(i+1)%mod;
}
int main(){
scanf("%d",&n),init(n);
for(int i=1;i<=n;i++)
ans=(ans+1ll*C(n-i,i-1)*fac[i-1]%mod*fac[n-i])%mod;
printf("%d\n",ans);
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 1ms
memory: 3628kb
input:
1
output:
1
result:
ok 1 number(s): "1"
Test #2:
score: 0
Accepted
time: 1ms
memory: 3572kb
input:
2
output:
1
result:
ok 1 number(s): "1"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3540kb
input:
10
output:
997920
result:
ok 1 number(s): "997920"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3632kb
input:
100
output:
188898954
result:
ok 1 number(s): "188898954"
Test #5:
score: 0
Accepted
time: 1ms
memory: 3636kb
input:
4
output:
10
result:
ok 1 number(s): "10"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3636kb
input:
8
output:
12336
result:
ok 1 number(s): "12336"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3876kb
input:
16
output:
373118483
result:
ok 1 number(s): "373118483"
Test #8:
score: 0
Accepted
time: 0ms
memory: 3824kb
input:
32
output:
314585464
result:
ok 1 number(s): "314585464"
Test #9:
score: 0
Accepted
time: 0ms
memory: 3880kb
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: 3876kb
input:
256
output:
65697890
result:
ok 1 number(s): "65697890"
Test #12:
score: 0
Accepted
time: 1ms
memory: 3644kb
input:
512
output:
854187619
result:
ok 1 number(s): "854187619"
Test #13:
score: 0
Accepted
time: 0ms
memory: 3884kb
input:
1024
output:
513823539
result:
ok 1 number(s): "513823539"
Test #14:
score: 0
Accepted
time: 22ms
memory: 14464kb
input:
1361956
output:
617368199
result:
ok 1 number(s): "617368199"
Test #15:
score: 0
Accepted
time: 113ms
memory: 62928kb
input:
7579013
output:
827172636
result:
ok 1 number(s): "827172636"
Test #16:
score: 0
Accepted
time: 109ms
memory: 67460kb
input:
8145517
output:
710624331
result:
ok 1 number(s): "710624331"
Test #17:
score: 0
Accepted
time: 87ms
memory: 51604kb
input:
6140463
output:
707600568
result:
ok 1 number(s): "707600568"
Test #18:
score: 0
Accepted
time: 47ms
memory: 31160kb
input:
3515281
output:
698302413
result:
ok 1 number(s): "698302413"
Test #19:
score: 0
Accepted
time: 100ms
memory: 58076kb
input:
6969586
output:
69470392
result:
ok 1 number(s): "69470392"
Test #20:
score: 0
Accepted
time: 37ms
memory: 26444kb
input:
2888636
output:
433579983
result:
ok 1 number(s): "433579983"
Test #21:
score: 0
Accepted
time: 117ms
memory: 81700kb
input:
9999998
output:
758172780
result:
ok 1 number(s): "758172780"
Test #22:
score: 0
Accepted
time: 121ms
memory: 81688kb
input:
9999999
output:
605195495
result:
ok 1 number(s): "605195495"
Test #23:
score: 0
Accepted
time: 121ms
memory: 81812kb
input:
10000000
output:
866813682
result:
ok 1 number(s): "866813682"