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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. const int MOD = 1e9 + 7;
  5. const int MAXN = 1e5 + 5;
  6.  
  7. int dp[MAXN];
  8.  
  9. int main() {
  10.     int n, k;
  11.     cin >> n >> k;
  12.  
  13.     dp[1] = 1;
  14.  
  15.     for (int i = 2; i <= n; i++) {
  16.         for (int j = 1; j <= k && i - j >= 1; j++) {
  17.             dp[i] = (dp[i] + dp[i - j]) % MOD;
  18.         }
  19.     }
  20.  
  21.     cout << dp[n] << endl;
  22.     return 0;
  23. }
  24.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/4U0FFr
language:
C++ (gcc 8.3)
created:
6 days ago
visibility:
public

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