[Offer收割]编程练习赛39 register

Ended

Participants:163

Verdict:Accepted
Score:100 / 100
Submitted:2017-12-10 14:16:51

Lang:G++

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#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll a[50],b[1010];  //an,a[0]
void finds(ll n)  //n
{
    ll i,j=0;
    for(i=2; i*i<=n; ++i)
        if(n%i==0)
        {
            while(n%i==0 )
                n/=i;
            a[++j]=i;
        }
    if(n>1) a[++j]=n;
    a[0]=j;
}
ll num(ll n)  //Searchmidn
{
    ll g=0,sum=n,i,j,t;
    b[++g]=1;
    for(i=1; i<=a[0]; i++)
    {
        t=g;
        for(j=1; j<=g; j++)
            b[++t]=b[j]*a[i]*(-1),sum+=n/b[t];
        g=t;
    }
    return sum;
}
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