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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define  ll long long
  4. #define  nl '\n'
  5. //#define  int long long
  6.  
  7.  
  8. const int N = 2e5 + 100;
  9. const int mod = 1e9 + 7;
  10. ll fact[N];
  11. ll inv[N]; //mod inverse for i
  12. ll invfact[N]; //mod inverse for i!
  13. void factInverse()
  14. {
  15.     fact[0] = inv[1] = fact[1] = invfact[0] = invfact[1] = 1;
  16.     for (long long i = 2; i < N; i++)
  17.     {
  18.         fact[i] = (fact[i - 1] * i) % mod;
  19.         inv[i] = mod - (inv[mod % i] * (mod / i) % mod);
  20.         invfact[i] = (inv[i] * invfact[i - 1]) % mod;
  21.     }
  22. }
  23.  
  24. ll nCr(int n, int r)
  25. {
  26.     if (r > n) return 0;
  27.     return (((fact[n] * invfact[r]) % mod) * invfact[n - r]) % mod;
  28. }
  29.  
  30. signed main()
  31. {
  32.     ios::sync_with_stdio(0);
  33.     cin.tie(0);
  34.     cout.tie(0);
  35.  
  36.  
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/WcXEC0
language:
C++14 (gcc 8.3)
created:
7 hours ago
visibility:
public

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