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#include<iostream>
#include<algorithm>
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>
using namespace std;
int L[100100],R[100010];
int n;
int a[100010];
int visit[100100];
void updatalr()
{
    memset(visit,0,sizeof(visit));
    for(int i=1;i<=n;i++)
    {
        int maxx = 0;
        int t = sqrt(a[i]);
        for(int j=t;j>=1;j--)
        {
            if(a[i]%j == 0)
            {
                maxx = max(maxx,visit[j]);
                maxx = max(maxx,visit[a[i]/j]);
            }
        }
        L[i] = maxx;
        visit[a[i]] = i;
    }
   for(int i=0;i<100001;i++)
   {
       visit[i] = n + 1;
   }
    for(int i=n;i>=1;i--)
    {
        int minn = n+1;
        int t = sqrt(a[i]);
        for(int j=t;j>=1;j--)
        {
            if(a[i]%j == 0)
            {
                minn = min(minn,visit[j]);
                minn = min(minn,visit[a[i]/j]);
            }
        }
        R[i] = minn;
        visit[a[i]] = i;
    }
}
int main()
{
    while(scanf("%d",&n)!=EOF)
    {
        __int64 sum = 0;
        memset(visit,0,sizeof(visit));
        for(int i=1;i<=n;i++)
        {
            scanf("%d",&a[i]);
        }
        updatalr();
        for(int i=1;i<=n;i++)
        {
            __int64 LL = (__int64)(i - L[i]);
            __int64 RR = (__int64)(R[i] - i);
            sum = (sum + (LL*RR))%1000000007;
        }
        printf("%I64d\n",sum);
    }
    return 0;
}
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HDU 5288 OO’s Sequence(多校第一场1001)
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原文地址:http://blog.csdn.net/yeguxin/article/details/46998903