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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#787133 | #8747. 朔望 | ffffyc | TL | 0ms | 0kb | C++14 | 2.5kb | 2024-11-27 10:00:26 | 2024-11-27 10:00:33 |
answer
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define lll __int128
namespace IO{//by cyffff
int len=0;
char ibuf[(1<<21)+1],*iS,*iT,out[(1<<25)+1];
#if ONLINE_JUDGE
#define gh() (iS==iT?iT=(iS=ibuf)+fread(ibuf,1,(1<<21)+1,stdin),(iS==iT?EOF:*iS++):*iS++)
#else
#define gh() getchar()
#endif
#define reg register
inline int read(){
reg char ch=gh();
reg int x=0;
reg char t=0;
while(ch<'0'||ch>'9') t|=ch=='-',ch=gh();
while(ch>='0'&&ch<='9') x=x*10+(ch^48),ch=gh();
return t?-x:x;
}
inline void putc(char ch){
out[len++]=ch;
}
template<class T>
inline void write(T x){
if(x<0)putc('-'),x=-x;
if(x>9)write(x/10);
out[len++]=x%10+48;
}
inline void flush(){
fwrite(out,1,len,stdout);
len=0;
}
inline char getc(){
char ch=gh();
while(ch<'A'||ch>'Z') ch=gh();
return ch;
}
}
using IO::read;
using IO::write;
using IO::flush;
using IO::getc;
using IO::putc;
#define pii pair<int,int>
#define mpr make_pair
#define fir first
#define sec second
const int N=20+5,mod=1e9+7;
inline int add(int a,int b){ return a+b>=mod?a+b-mod:a+b; }
inline int dec(int a,int b){ return a>=b?a-b:a+mod-b; }
inline void inc(int &a,int b){ a=a+b>=mod?a+b-mod:a+b; }
inline int qpow(int x,int y){
int res=1;
while(y){
if(y&1) res=1ll*res*x%mod;
x=1ll*x*x%mod;
y>>=1;
}
return res;
}
int n,t[N],w[N],p[N],f[N],C[N][N];
ll x[N],y[N],b[N],c[N];
int main(){
n=read();
for(int i=0;i<n;i++)
t[i]=read();
for(int i=2;i<=n;i++)
w[i]=read();
for(int i=0;i<=n;i++){
C[i][0]=1;
for(int j=1;j<=i;j++)
C[i][j]=add(C[i-1][j-1],C[i-1][j]);
}
int u=1<<n;
for(int s=0;s<u;s++){
if(__builtin_popcount(s)<=1) continue;
int ct=0;
for(int i=0;i<n;i++)
if(s>>i&1)
p[ct++]=i;
for(int i=0;i<ct;i++)
x[i]=t[p[i]]-t[p[0]],y[i]=t[p[i]];
for(int i=1;i<ct;i++){
int tc=0;
c[i]=x[i];
for(int j=1;j<i;j++) c[j]=y[j];
b[i]=i==1?x[i]:y[i];
for(int j=1;j<=i;j++){
int p=1;
for(int k=1;k<=i&&p!=b[j];k++){
int w=__gcd(b[j]/p,c[k]);
c[k]/=w,p*=w;
}
b[j]=p;
}
}
ll u=1,v=1;
for(int i=1;i<ct;i++) u=u*b[i]%mod;
for(int i=0;i<ct;i++) v=v*y[i]%mod;
// printf("%d %d/%d\n",s,u,v);
inc(f[ct],2ll*u*qpow(v,mod-2)%mod);
}
int ans=0;
for(int i=2;i<=n;i++){
int s=0;
for(int j=i;j<=n;j++){
int v=1ll*f[j]*C[j][i]%mod;
if(j-i&1) v=dec(0,v);
inc(s,v);
}
inc(ans,1ll*s*w[i]%mod);
}
write(ans);
flush();
}
Details
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Test #1:
score: 0
Time Limit Exceeded
input:
20 73415948 190825288 205086969 242726140 280691039 291234110 341933576 379938879 399631744 420807939 421811250 486105558 605031352 645495854 714594262 775221445 793534057 818237037 926135349 940293639 108200337 125078426 163639475 261733041 280562529 287327830 310288774 415301468 419144734 46329977...