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ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#746324 | #9619. 乘积,欧拉函数,求和 | Qzong# | WA | 8ms | 2924kb | C++14 | 2.2kb | 2024-11-14 14:14:46 | 2024-11-14 14:14:46 |
Judging History
answer
#include<cstdio>
#include<cstring>
#include<algorithm>
const int N=3020;
const int mod=998244353;
int n;
int pri[N],tot,k[N],id[N],mx[N],f[2][1<<17|10];
struct node{
int val,mx;
bool operator<(const node &A)const {
return mx<A.mx;
}
}a[N];
int ad(int x,int y){
return x+y>=mod?x+y-mod:x+y;
}
int ksm(int x,int y){
int ans=1;
while(y){
if(y&1)ans=1ll*ans*x%mod;
x=1ll*x*x%mod;
y>>=1;
}
return ans;
}
int inv[N],go[1<<17|10];
int main(){
// freopen("a.in","r",stdin);
scanf("%d",&n);
for(int i=1;i<=n;i++)scanf("%d",&a[i].val);
for(int i=1;i<=3000;i++)inv[i]=ksm(i,mod-2);
for(int i=2;i<=3000;i++){
if(!k[i]){
pri[++tot]=i,id[i]=tot-1,mx[i]=i;
int now=i+i;
while(now<=3000){
k[now]=1,mx[now]=i;
now+=i;
}
}
}
for(int i=0;i<(1<<16);i++){
go[i]=1;
for(int j=0;j<16;j++)if((1<<j)&i){
go[i]=1ll*(pri[j+1]-1)*inv[pri[j+1]]%mod;
}
}
for(int i=1;i<=n;i++)a[i].mx=mx[a[i].val];
f[0][0]=1;
std::sort(a+1,a+n+1);
// for(int i=1;i<=n;i++)printf("%d ",a[i].mx);
// puts("");
for(int i=1;i<=n;i++){
int o=i&1;
memset(f[o],0,sizeof f[o]);
int now=0;
for(int j=1;j<=16;j++)if(a[i].val%pri[j]==0)now|=1<<(j-1);
if(a[i].mx>53)now|=1<<16;
if(a[i].mx!=a[i-1].mx){
for(int j=0;j<(1<<16);j++)f[o^1][j]=ad(f[o^1][j],f[o^1][j|(1<<16)]);
}
for(int j=0;j<(1<<17);j++){
int ooo=now^(j&now);
int flag;
if(ooo&(1<<16))flag=1,ooo^=(1<<16);
else flag=0;
ooo=go[ooo];
if(flag)ooo=1ll*ooo*(a[i].mx-1)%mod*inv[a[i].mx]%mod;
f[o][j|now]=ad(f[o][j|now],1ll*f[o^1][j]*a[i].val%mod*ooo%mod);
f[o][j]=ad(f[o][j],f[o^1][j]);
}
// for(int j=0;j<(1<<3);j++){
// printf("%d %d\n",j,f[o][j]);
// }
}
int ans=0;
for(int j=0;j<(1<<17);j++)ans=ad(ans,f[n&1][j]);
printf("%d\n",ans);
return 0;
}
Details
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Test #1:
score: 0
Wrong Answer
time: 8ms
memory: 2924kb
input:
5 1 6 8 6 2
output:
924
result:
wrong answer 1st lines differ - expected: '892', found: '924'