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  1. #include "bits/stdc++.h"
  2. using namespace std;
  3. #define fastio ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
  4. #define vint vector<int>
  5. #define int long long
  6. #define nl '\n'
  7.  
  8. const int N = 1e6 + 5, MOD = 1e9 + 7;
  9. int n, dp[N];
  10.  
  11. int sol(int sum){
  12.     if (sum > n) return 0;
  13.     if (sum == n) return 1;
  14.     int &x = dp[sum];
  15.     if(x != -1) return x;
  16.     x = 0;
  17.     for (int i = 1; i <= 6; i++)
  18.         x = (x + sol(sum + i)) % MOD;
  19.  
  20.     return x; 
  21. }
  22.  
  23.  
  24. void solve() {
  25.     cin>>n;
  26.     memset(dp, -1, sizeof dp);
  27.     cout<<sol(0);
  28. }
  29.  
  30. int32_t main() {
  31.     fastio
  32.     int t = 1; //cin>>t;
  33.     while (t--) solve();
  34.     return 0;
  35. }
Success #stdin #stdout 0.01s 11312KB
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https://ideone.com/3DQuwG
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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