QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#367147#6736. Alice and BobBerlin_JacorTL 987ms32796kbC++144.3kb2024-03-25 19:25:532024-03-25 19:25:53

Judging History

你现在查看的是最新测评结果

  • [2024-03-25 19:25:53]
  • 评测
  • 测评结果:TL
  • 用时:987ms
  • 内存:32796kb
  • [2024-03-25 19:25:53]
  • 提交

answer

#include<bits/stdc++.h>
//#include<ext/rope>
//#include<bits/extc++.h>
//using namespace __gnu_cxx;
//using namespace __gnu_pbds;
using namespace std;
//typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>order_set;
//find_by_order() order_of_key()
const int maxn=2e3+5;
const int INF=0x3f3f3f3f;
const int inf=0x3f3f3f3f;
//#define int long long
//#define double long double
const int LINF=0x3f3f3f3f3f3f3f3f;
#define bit(x) (1LL << (x))
#define lowbit(x) (x & (-x))
#define sq(x) ((x) * (x))
#define pb(i) push_back(i)
#define mk(i,j) make_pair((i),(j))
#define pum(i,j) push(make_pair((i),(j)))
#define pbm(i,j) push_back(make_pair((i),(j)))
#define fup(a,b,c,d) for(int a=(b);a<=(c);a+=(d))
#define fdown(a,b,c,d) for(int a=(b);a>=(c);a-=(d))
typedef unsigned long long ull;
#define ull unsigned ll
using ll = long long;
using pi = pair<int,int>;
using vi = vector<int>;
using vd = vector<double>;
using vc = vector<char>;
using vp = vector<pair<int,int>>;
using vvi = vector<vector<int>>;
using vvd = vector<vector<double>>;
using vvp = vector<vector<pair<int,int>>>;
using vvc = vector<vector<char>>;
using mi = map<int,int>;
using mpi = map<pair<int,int>,int>;
using miv = map<int,vector<int>>;
using mpv = map<pair<int,int>,vi>;
using gi = greater<int>;
using gp = greater<pi>;
using djs_queue =priority_queue<pi,vp,gp>;
//using ld = long double;
using namespace std;
double eps=1e-12;
double pai=acos(-1.0);
int mod=998244353;
const int zsmaxn=0;


vi zs(zsmaxn,0);
void Prime() {
    zs[0]=zs[1]=1;
    fup (i,2,zsmaxn,1) {
        if (zs[i]) continue;
        fup(j,i*i,maxn,i) {
            zs[j]=1;
        }
    }
}
int gcd(int a, int b){
    return b?gcd(b,a%b):a;
}
int ksminv(int a,int b,int p) {
    int ans=1;
    a=(a%p+p)%p;
    for(;b;b>>=1) {
        if(b&1)ans=(a*ans)%p;
        a=(a*a)%p;
    }
    return ans;
}
void exgcdinv(int a,int b,int& x,int& y) {
    if (b==0){x=1,y=0;return;}
    exgcdinv(b,a%b,y,x);
    y-=a/b*x;
}
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;
}
//void add(int &x,int y) {
//    x+=y;
//    if(x>=mod)x-=mod;
//    if(x<0)x+=mod;
//}
void multiplication(int &x,int y){
    x=x*y%mod;
}
int dx[]={0,0,1,-1,1,1,-1,-1};
int dy[]={1,-1,0,0,1,-1,1,-1};

void solve()
{
    int n;
    cin >> n;
    long long ans = 0;
    const int p = 998244353;
    vi lc(n + 10, 0);
    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
//#     ┃   ┃
//#     ┃   ┃  +         
//#     ┃    ┗━━━┓ + +
//#     ┃        ┣┓
//#     ┃        ┏┛
//#     ┗┓┓┏━┳┓┏┛ + + + +
//#      ┃┫┫ ┃┫┫
//#      ┗┻┛ ┗┻┛+ + + +
//————————————————————————————————

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3796kb

input:

1

output:

1

result:

ok 1 number(s): "1"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3632kb

input:

2

output:

1

result:

ok 1 number(s): "1"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3564kb

input:

10

output:

997920

result:

ok 1 number(s): "997920"

Test #4:

score: 0
Accepted
time: 0ms
memory: 3636kb

input:

100

output:

188898954

result:

ok 1 number(s): "188898954"

Test #5:

score: 0
Accepted
time: 0ms
memory: 3672kb

input:

4

output:

10

result:

ok 1 number(s): "10"

Test #6:

score: 0
Accepted
time: 0ms
memory: 3564kb

input:

8

output:

12336

result:

ok 1 number(s): "12336"

Test #7:

score: 0
Accepted
time: 0ms
memory: 3520kb

input:

16

output:

373118483

result:

ok 1 number(s): "373118483"

Test #8:

score: 0
Accepted
time: 0ms
memory: 3800kb

input:

32

output:

314585464

result:

ok 1 number(s): "314585464"

Test #9:

score: 0
Accepted
time: 0ms
memory: 3604kb

input:

64

output:

627827331

result:

ok 1 number(s): "627827331"

Test #10:

score: 0
Accepted
time: 0ms
memory: 3568kb

input:

128

output:

828497685

result:

ok 1 number(s): "828497685"

Test #11:

score: 0
Accepted
time: 0ms
memory: 3848kb

input:

256

output:

65697890

result:

ok 1 number(s): "65697890"

Test #12:

score: 0
Accepted
time: 0ms
memory: 3568kb

input:

512

output:

854187619

result:

ok 1 number(s): "854187619"

Test #13:

score: 0
Accepted
time: 1ms
memory: 3552kb

input:

1024

output:

513823539

result:

ok 1 number(s): "513823539"

Test #14:

score: 0
Accepted
time: 179ms
memory: 8608kb

input:

1361956

output:

617368199

result:

ok 1 number(s): "617368199"

Test #15:

score: 0
Accepted
time: 987ms
memory: 32796kb

input:

7579013

output:

827172636

result:

ok 1 number(s): "827172636"

Test #16:

score: -100
Time Limit Exceeded

input:

8145517

output:

710624331

result: