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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 |
---|---|---|---|---|---|---|---|---|---|
#739628 | #9619. 乘积,欧拉函数,求和 | DBsoleil# | WA | 1ms | 6004kb | C++23 | 2.3kb | 2024-11-12 22:28:04 | 2024-11-12 22:28:09 |
Judging History
answer
#include<bits/stdc++.h>
#define pb push_back
using namespace std;
typedef double db;
typedef long long ll;
const int N=66005,K=2,tot=1<<K;
const ll MOD=998244353;
int n,a[N];
ll f[N],g[N],p[N];
vector<int> ve[N];
int pr[25]={2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53};
ll inv[25];
ll ksm(ll a,ll b)
{
ll res=1;
for(int i=b;i;i>>=1,a=a*a%MOD) if(i&1) res=res*a%MOD;
return res;
}
void work(int a)
{
int x=a;
for(int i=0;i<K;i++) if(a%pr[i]==0)
{
while(a%pr[i]==0) a/=pr[i];
}
ve[a].pb(x);
//cerr<<' '<<x<<' '<<a<<endl;
}
void input()
{
scanf("%d",&n);
for(int i=1;i<=n;i++) scanf("%d",&a[i]),work(a[i]);
}
void add(ll&x,ll y) {x=(x+y)%MOD;}
bool in(int msk,int i) {return (msk>>i)&1;}
int workp(int M)
{
int nmsk=0,prod=1;
for(int i=0;i<K;i++)
{
int P=pr[i];
if(M%P) continue;
nmsk|=(1<<i);
prod*=P-1,M/=P;
while(M%P==0) M/=P,prod*=P;
}
p[0]=prod;
// cerr<<'!'<<M<<' '<<p[0]<<endl;
for(int msk=1;msk<tot;msk++)
{
int lb=msk&-msk,j=log2(lb);
p[msk]=p[msk^lb];
if(in(nmsk,j)) p[msk]=p[msk]*inv[j]%MOD*pr[j]%MOD;
}
//cerr<<' '<<M<<' '<<nmsk<<' '<<p[0]<<' '<<p[1]<<' '<<p[2]<<' '<<p[3]<<endl;
return nmsk;
}
void dodp(vector<int>ve,int P)
{
memset(g,0,sizeof(g));
int Q=P==1?1:P-1;
for(int M:ve)
{
int nmsk=workp(M);
//cerr<<' '<<nmsk<<endl;
for(int msk=tot-1;msk>=0;msk--)
{
add(g[msk|nmsk],g[msk]*p[msk]%MOD*P%MOD);
add(g[msk|nmsk],f[msk]*p[msk]*Q%MOD);
//cerr<<' '<<msk<<' '<<(msk|nmsk)<<' '<<f[msk]<<' '<<p[msk]<<endl;
}
}
// for(int i=0;i<tot;i++)
// {
// cerr<<' '<<i<<" "<<g[i]<<endl;
// }
for(int i=0;i<tot;i++) add(f[i],g[i]),g[i]=0;
}
void solve()
{
input();
f[0]=1;
for(int i=1;i<=3000;i++) if(!ve[i].empty()) dodp(ve[i],i);
ll ans=0;
for(int i=0;i<tot;i++) add(ans,f[i]);
printf("%lld\n",ans);
}
void prework()
{
for(int i=0;i<K;i++) inv[i]=ksm(pr[i]-1,MOD-2);
// cerr<<' '<<inv[0]<<' '<<inv[1]<<endl;
}
int main()
{
prework();
int T=1;
while(T--) solve();
}
详细
Test #1:
score: 100
Accepted
time: 1ms
memory: 6004kb
input:
5 1 6 8 6 2
output:
892
result:
ok single line: '892'
Test #2:
score: 0
Accepted
time: 1ms
memory: 4480kb
input:
5 3 8 3 7 8
output:
3157
result:
ok single line: '3157'
Test #3:
score: -100
Wrong Answer
time: 0ms
memory: 4584kb
input:
2000 79 1 1 1 1 1 1 2803 1 1 1 1 1 1 1609 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2137 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 613 1 499 1 211 1 2927 1 1 1327 1 1 1123 1 907 1 2543 1 1 1 311 2683 1 1 1 1 2963 1 1 1 641 761 1 1 1 1 1 1 1 1 1 1 1 1489 2857 1 1 1 1 1 1 1 1 1 1 1 1 1 967 1 821 1 1 1 1 2143 1861...
output:
280064840
result:
wrong answer 1st lines differ - expected: '50965652', found: '280064840'