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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 |
---|---|---|---|---|---|---|---|---|---|
#425967 | #8721. 括号序列 | forget-star | TL | 53ms | 12332kb | C++20 | 4.0kb | 2024-05-30 19:42:49 | 2024-05-30 19:42:50 |
Judging History
answer
#include<bits/stdc++.h>
#define de fprintf(stderr,"on-%d\n",__LINE__)
//#define int long long
#define fr(i,a,b) for(int i(a),end##i(b);i<=end##i;i++)
#define fd(i,a,b) for(int i(a),end##i(b);i>=end##i;i--)
#define vec vector<int>
using namespace std;
const int maxn=2e6+5,mod=998244353,G=3;
inline int upd(const int &x){
if(x<0)return x+mod;
if(x>=mod)return x-mod;
return x;
}
inline void add(int &x,const int &y){
x=upd(x+y);
}
int ksm(int x,int k){
int ans=1;
while(k){
if(k&1)ans=1ll*ans*x%mod;
x=1ll*x*x%mod;
k>>=1;
}
return ans;
}
int jc[maxn],iv[maxn];
void init(int n){
jc[0]=1;
fr(i,1,n)jc[i]=1ll*jc[i-1]*i%mod;
iv[n]=ksm(jc[n],mod-2);
fd(i,n-1,0)iv[i]=1ll*iv[i+1]*(i+1)%mod;
}
int ny(int n){
return 1ll*iv[n]*jc[n-1]%mod;
}
const int invg=ksm(G,mod-2);
int rev[maxn];
void F(int *f,int n,int h){
fr(i,0,n-1)if(rev[i]<i)swap(f[rev[i]],f[i]);
for(int p=1;p<n;p<<=1){
int wn=ksm(h==1?G:invg,(mod-1)/(p<<1));
for(int i=0;i<n;i+=p<<1)
for(int k=i,w=1;k<i+p;k++,w=1ll*w*wn%mod){
int x=f[k],y=1ll*f[k+p]*w%mod;
f[k]=upd(x+y);
f[k+p]=upd(x-y);
}
}
if(h==-1){
int invn=ny(n);
fr(i,0,n-1)f[i]=1ll*f[i]*invn%mod;
}
}
vector<int> operator *(const vector<int>& A,const vector<int>& B){
static int a[maxn],b[maxn];
int N=1;
while(N-1<=A.size()-1+B.size()-1)N<<=1;
fr(i,1,N)rev[i]=(rev[i>>1]>>1)|(i&1?N>>1:0);
fr(i,0,N-1)a[i]=b[i]=0;
fr(i,0,A.size()-1)a[i]=A[i];fr(i,0,B.size()-1)b[i]=B[i];
F(a,N,1);F(b,N,1);
fr(i,0,N-1)a[i]=1ll*a[i]*b[i]%mod;
F(a,N,-1);
vector<int> C;C.resize(A.size()+B.size()-1);
fr(i,0,C.size()-1)C[i]=a[i];
return C;
}
vector<int> operator -(vector<int> A,const vector<int>&B){
if(B.size()>A.size())A.resize(B.size());
fr(i,0,B.size()-1)add(A[i],-B[i]);
return A;
}
vector<int> operator +(vector<int> A,const vector<int>&B){
if(B.size()>A.size())A.resize(B.size());
fr(i,0,B.size()-1)add(A[i],B[i]);
return A;
}
vector<int> operator *(vector<int> A,const int &x){
fr(i,0,A.size()-1)A[i]=1ll*A[i]*x%mod;
return A;
}
vector<int> inv(vector<int> A,int N){
vector<int> F,f0;
F.push_back(ksm(A[0],mod-2));
for(int n=2;n>>1<N;n<<=1){
f0=F;
F=f0*2-f0*f0*A;
F.resize(n);
}
F.resize(N);
return F;
}
vector<int> D(vector<int> A){
fr(i,0,A.size()-2)A[i]=1ll*A[i+1]*(i+1)%mod;
A.resize(A.size()-1);
return A;
}
vector<int> Int(vector<int> A){
A.resize(A.size()+1);
fd(i,A.size()-1,1)A[i]=1ll*A[i-1]*ny(i)%mod;
A[0]=0;
return A;
}
vector<int> ln(const vector<int> &A,int n){
vector<int> C=D(A)*inv(A,n);
C.resize(n);
C=Int(C);
C.resize(n);
return C;
}
vector<int> exp(const vector<int> &A,int N){
vector<int> f0,F,G;
F.push_back(1);
for(int n=2;n>>1<N;n<<=1){
f0=F;
G.resize(n);
fr(i,0,G.size()-1)G[i]=i<(int)A.size()?A[i]:0;
F=f0-(ln(f0,n)-G)*f0;
F.resize(n);
}
F.resize(N);
return F;
}
void out(vec A){
fr(i,0,A.size()-1)cout<<A[i]<<' ';cout<<'\n';
}
vec solve(int N){
vector<int> F,f0,A,B,T;
F.push_back(1);
for(int n=2;n>>1<N;n<<=1){
f0=F;
B=f0*f0;B.resize(n);A=B;A=A*f0;A.resize(n);
T.resize(n);
T[0]=1;
fr(i,1,n-1)T[i]=i<=f0.size()?upd(-f0[i-1]):0;
T=inv(T,n);
B[0]=3ll*B[0]%mod;
fr(i,1,n-1)B[i]=upd((3ll*B[i]-2ll*A[i-1])%mod);
A=A*T;A.resize(n);
//out(A);
T=T*T;T.resize(n);
//out(T);
B=B*T;B.resize(n);
//out(B);
A=A-B*f0;A.resize(n);
//out(A);
B=Int(B);B.resize(n);
fr(i,0,n-1)B[i]=upd(-B[i]);
B=exp(B,n);
A=A*B;A.resize(n);
//out(A);
A=Int(A);A.resize(n);
// out(A);
B=inv(B,n);
A[0]=1;
//out(B);
F=A*B;F.resize(n);
//out(F);
}
//fr(i,0,N-1)printf("%lld ",F[i]);cout<<'\n';
return F;
}
signed main(){
#ifdef pig
freopen("pig.in","r",stdin);
freopen("pig.out","w",stdout);
#endif
int n;
vector<int> A;
scanf("%d",&n);
int N=1;
while(N<n+1)N<<=1;
init(N<<2);
cout<<1ll*solve(N)[n]*jc[n]%mod;
/*A.resize(n);
fr(i,0,n-1)scanf("%lld",&A[i]);
A=exp(A,n);
fr(i,0,n-1)printf("%lld ",A[i]);*/
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 3ms
memory: 11884kb
input:
3
output:
28
result:
ok 1 number(s): "28"
Test #2:
score: 0
Accepted
time: 2ms
memory: 12156kb
input:
1
output:
1
result:
ok 1 number(s): "1"
Test #3:
score: 0
Accepted
time: 3ms
memory: 11948kb
input:
2
output:
4
result:
ok 1 number(s): "4"
Test #4:
score: 0
Accepted
time: 3ms
memory: 11892kb
input:
4
output:
282
result:
ok 1 number(s): "282"
Test #5:
score: 0
Accepted
time: 3ms
memory: 11872kb
input:
5
output:
3718
result:
ok 1 number(s): "3718"
Test #6:
score: 0
Accepted
time: 0ms
memory: 11904kb
input:
6
output:
60694
result:
ok 1 number(s): "60694"
Test #7:
score: 0
Accepted
time: 3ms
memory: 11940kb
input:
7
output:
1182522
result:
ok 1 number(s): "1182522"
Test #8:
score: 0
Accepted
time: 3ms
memory: 11912kb
input:
8
output:
26791738
result:
ok 1 number(s): "26791738"
Test #9:
score: 0
Accepted
time: 0ms
memory: 11908kb
input:
9
output:
692310518
result:
ok 1 number(s): "692310518"
Test #10:
score: 0
Accepted
time: 0ms
memory: 11872kb
input:
10
output:
135061370
result:
ok 1 number(s): "135061370"
Test #11:
score: 0
Accepted
time: 5ms
memory: 12208kb
input:
100
output:
423669705
result:
ok 1 number(s): "423669705"
Test #12:
score: 0
Accepted
time: 53ms
memory: 12332kb
input:
1234
output:
878522960
result:
ok 1 number(s): "878522960"
Test #13:
score: -100
Time Limit Exceeded
input:
54321