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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#208893 | #4478. Jo loves counting | 11d10xy | AC ✓ | 442ms | 23324kb | C++14 | 924b | 2023-10-09 21:52:57 | 2023-10-09 21:52:57 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using lll=__int128;
constexpr ll mod=29ll<<57|1,mxn=1e12;
constexpr int sqn=1e6;
auto ml=[](ll x,ll y)->ll{return(lll)x*y%mod;};
auto inv=[](ll p){ll res=1,t=mod-2;for(;t;t>>=1,p=ml(p,p))if(t&1)res=ml(res,p);return res;};
auto sum=[](ll n)->ll{return(lll)n*(n+1)/2%mod;};
int p[sqn+10],pt;
basic_string<ll>h[79010];
ll n;
ll dfs(ll now,ll v,int i){
if(i>pt||now>n/p[i]/p[i])return ml(v,sum(n/now));
ll res=0;
for(int j=0;now<=n;now*=p[i],j++)
(res+=j!=1?dfs(now,ml(v,h[i][j]),i+1):0)%=mod;
return res;
}
int main(){
for(int i=2;i<=sqn;i++)
if(!p[i])for(int j=p[++pt]=i;j<=sqn;j+=i)p[j]=1;
for(int i=1;i<=pt;i++){
h[i]={1};
ll n=1,v=1;
for(int j=1;(n*=p[i])<=mxn;j++)
v=ml(v,p[i]),h[i]+=(ml(n,inv(j))+mod-v)%mod,(v+=h[i][j])%=mod;
}
int T;
for(cin>>T;T--;)cin>>n,cout<<ml(dfs(1,1,1),inv(n))<<endl;
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 442ms
memory: 23324kb
input:
12 4 959139 9859 125987 209411 965585325539 213058376259 451941492387 690824608515 934002691939 1000000000000 1
output:
2 2544652967005436170 1531132428015608197 4112905740393076193 2210911161352244432 3734327250979959061 3166689602614938339 2205751131915532448 1440445581699720020 350511728590182760 1099683734530790325 1
result:
ok 12 lines