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  1. #include <iostream>
  2. #include <cstdio>
  3. #include <cmath>
  4. const int maxn = 2001;
  5. const int oo = 1000000007;
  6. using namespace std;
  7. long long n,m,dp[maxn][maxn],u[maxn][maxn];
  8. int main()
  9. {
  10.     std::ios_base::sync_with_stdio(false);
  11.     //freopen("psu01.inp","r",stdin);
  12.     //freopen("psu01.out","w",stdout);
  13.     cin >> n >> m;
  14.     for (int i=1; i<=n; i++)
  15.     {
  16.         dp[i][1]=1;
  17.         u[i][0]=1;
  18.         u[i][1]=1;
  19.     }
  20.     for (int i=2; i<=n; i++)
  21.     for (int j=i; j<=n; j+=i)
  22.     {
  23.         u[j][0]++;
  24.         u[j][u[j][0]]=i;
  25.     }
  26.     for (int i=2; i<=m; i++)
  27.     for (int j=1; j<=n; j++)
  28.     {
  29.         dp[j][i]=0;
  30.         for (int z=1; z<=u[j][0]; z++)
  31.         dp[j][i]=(dp[j][i]+dp[u[j][z]][i-1])%oo;
  32.         //cout << j << ' ' << i << ' ' <<dp[j][i] << "\n";
  33.     }
  34.     long res=0;
  35.     for (int i=1; i<=n; i++)
  36.     res=(res+dp[i][m])%oo;
  37.     cout << res;
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0s 65984KB
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https://ideone.com/NvTnD2
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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