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 |
|---|---|---|---|---|---|---|---|---|---|
| #367152 | #6736. Alice and Bob | Berlin_Jacor | AC ✓ | 687ms | 42692kb | C++14 | 2.3kb | 2024-03-25 19:28:36 | 2024-03-25 19:28:37 |
Judging History
answer
#include<bits/stdc++.h>
//#include<ext/rope>
//#include<bits/extc++.h>
//using namespace __gnu_cxx;
//using namespace __gnu_pbds;
using namespace std;
const int mod = 998244353;
int qpow(int x,int y) {
long long res=1;
while(y){
if(y&1)res=res*x%mod;
x=1ll*x*x%mod;
y>>=1;
}
return res;
}
int lc[10000005];
void solve()
{
int n;
cin >> n;
long long ans = 0;
const int p = 998244353;
lc[0] = 1;
for (int i = 1; i <= n; ++i) {
lc[i] = 1ll*lc[i - 1] * i % p;
}
for (int i = 1; n - 2 * i + 1 >= 0; ++i) {
ans = (ans + 1ll*lc[n-i] * lc[n-i] % p * qpow(lc[n-2*i+1],p-2) % p) % p ;
}
cout << ans << "\n";
}
signed main(){
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
//cout<<fixed<<setprecision(2);
// clock_t tStart=clock();
//SetIO("main");
// freopen("data3.in","r",stdin);
// freopen("out.txt","w",stdout);
//Prime();
int T = 1;
//cin >> T;
while(T--) {
solve();
}
//cerr<<"\nTime Taken: ";
//cerr<<fixed<<setprecision(0)<<(double)(clock() - tStart)/CLOCKS_PER_SEC;
}
/*
*/
//# ┏┓ ┏┓+ +
//# ┏┛┻━━━┛┻┓ + +
//# ┃ ┃
//# ┃ ━ ┃ ++ + + +
//# ████━████ ┃+
//# ┃ ┃ +
//# ┃ ┻ ┃
//# ┃ ┃ + +
//# ┗━┓ ┏━┛
//# ┃ ┃
//# ┃ ┃ + + + +
//# ┃ ┃
//# ┃ ┃ + gmy保佑,一发过,不能再痒了
//# ┃ ┃
//# ┃ ┃ +
//# ┃ ┗━━━┓ + +
//# ┃ ┣┓
//# ┃ ┏┛
//# ┗┓┓┏━┳┓┏┛ + + + +
//# ┃┫┫ ┃┫┫
//# ┗┻┛ ┗┻┛+ + + +
//————————————————————————————————
詳細信息
Test #1:
score: 100
Accepted
time: 1ms
memory: 3612kb
input:
1
output:
1
result:
ok 1 number(s): "1"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3616kb
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: 1ms
memory: 3672kb
input:
100
output:
188898954
result:
ok 1 number(s): "188898954"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3676kb
input:
4
output:
10
result:
ok 1 number(s): "10"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3556kb
input:
8
output:
12336
result:
ok 1 number(s): "12336"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3652kb
input:
16
output:
373118483
result:
ok 1 number(s): "373118483"
Test #8:
score: 0
Accepted
time: 0ms
memory: 3664kb
input:
32
output:
314585464
result:
ok 1 number(s): "314585464"
Test #9:
score: 0
Accepted
time: 1ms
memory: 3684kb
input:
64
output:
627827331
result:
ok 1 number(s): "627827331"
Test #10:
score: 0
Accepted
time: 1ms
memory: 3704kb
input:
128
output:
828497685
result:
ok 1 number(s): "828497685"
Test #11:
score: 0
Accepted
time: 0ms
memory: 3552kb
input:
256
output:
65697890
result:
ok 1 number(s): "65697890"
Test #12:
score: 0
Accepted
time: 0ms
memory: 3644kb
input:
512
output:
854187619
result:
ok 1 number(s): "854187619"
Test #13:
score: 0
Accepted
time: 1ms
memory: 3712kb
input:
1024
output:
513823539
result:
ok 1 number(s): "513823539"
Test #14:
score: 0
Accepted
time: 87ms
memory: 8884kb
input:
1361956
output:
617368199
result:
ok 1 number(s): "617368199"
Test #15:
score: 0
Accepted
time: 513ms
memory: 33312kb
input:
7579013
output:
827172636
result:
ok 1 number(s): "827172636"
Test #16:
score: 0
Accepted
time: 554ms
memory: 35416kb
input:
8145517
output:
710624331
result:
ok 1 number(s): "710624331"
Test #17:
score: 0
Accepted
time: 423ms
memory: 27548kb
input:
6140463
output:
707600568
result:
ok 1 number(s): "707600568"
Test #18:
score: 0
Accepted
time: 244ms
memory: 17296kb
input:
3515281
output:
698302413
result:
ok 1 number(s): "698302413"
Test #19:
score: 0
Accepted
time: 474ms
memory: 30884kb
input:
6969586
output:
69470392
result:
ok 1 number(s): "69470392"
Test #20:
score: 0
Accepted
time: 201ms
memory: 14936kb
input:
2888636
output:
433579983
result:
ok 1 number(s): "433579983"
Test #21:
score: 0
Accepted
time: 687ms
memory: 42692kb
input:
9999998
output:
758172780
result:
ok 1 number(s): "758172780"
Test #22:
score: 0
Accepted
time: 674ms
memory: 42664kb
input:
9999999
output:
605195495
result:
ok 1 number(s): "605195495"
Test #23:
score: 0
Accepted
time: 676ms
memory: 42668kb
input:
10000000
output:
866813682
result:
ok 1 number(s): "866813682"