hdu 4472 Count（递推即dp)

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=4472

 

代码：

#include <cstdio>
#include <cstring>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <queue>
#include <vector>
#include <utility>
using namespace std;

const int maxn = 1055;
const int maxe = 1e6+100;
const int INF  = 0x3f3f3f3f;
const int mod = 1e9 +7;

int main()
{

    long long dp[maxn];
    int n;
    dp[1] = 1;
    dp[2] = 1;
    dp[3] = 2;
    for(int i=4;i<=1005;i++)
    {
        dp[i] = dp[i-1];
        for(int j=2;j<=i-1;j++)
        {
            if((i-1)%j == 0)
            {
                dp[i] += dp[(i-1)/j];
            }
        }
    }

    int T = 0;
    while(cin>>n)
    {
        printf("Case %d: %d\n",++T,dp[n]%mod);
    }
}