hdu4961 Boring Sum

#include <iostream>
#include <cstdlib>
#include <cstring>
#include <string>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <map>
#define inf 0x3f3f3f3f
#pragma comment(linker, "/STACK:16777216")
#define eps 1e-6
#define ll long long
using namespace std;

const int maxn=100010;
vector<int> v[maxn];
int a[maxn],b[maxn],s[maxn],h[maxn];

int main()
{
    int i,j,n;
    for(i=1;i<maxn;i++)//预处理每个数的约数 注意这里不能取等 不然超了
        for(j=i;j<maxn;j+=i)
            v[j].push_back(i);
    while(~scanf("%d",&n)&&n)
    {
        for(i=1;i<=n;i++)
            scanf("%d",s+i);
        memset(h,-1,sizeof h);
        for(i=1;i<=n;i++)
        {
            if(h[s[i]]!=-1)
                b[i]=s[h[s[i]]];
            else b[i]=s[i];
            for(j=0;j<v[s[i]].size();j++)
                h[v[s[i]][j]]=i;
        }

        memset(h,-1,sizeof h);
        for(i=n;i>0;i--)
        {
            if(h[s[i]]!=-1)
                a[i]=s[h[s[i]]];
            else a[i]=s[i];
            for(j=0;j<v[s[i]].size();j++)
                h[v[s[i]][j]]=i;
        }
        ll ans=0;
        for(i=1;i<=n;i++)
            ans+=(ll)a[i]*b[i];
        cout<<ans<<endl;
    }
    return 0;
}

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