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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define mod 1000000007
  5.  
  6. int main()
  7. {
  8.         ll n, fd, tmp_fd, fa, tmp_fa, fb, tmp_fb, fc, tmp_fc;
  9.         fd = 0, fa = fb = fc = 1;
  10.         cin >> n;
  11.  
  12.         for (ll i = 2; i <= n; i++)
  13.         {
  14.  
  15.                 tmp_fd = fd;
  16.                 fd = (fa + fb + fc) % mod;
  17.                 tmp_fa = fa;
  18.                 fa = (tmp_fd + fb + fc) % mod;
  19.                 tmp_fb = fb;
  20.                 fb = (tmp_fa + tmp_fd + fc) % mod;
  21.                 tmp_fc = fc;
  22.                 fc = (tmp_fa + tmp_fb + tmp_fd) % mod;
  23.         }
  24.         cout << fd;
  25. }
Success #stdin #stdout 0s 4932KB
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https://ideone.com/zCEga9
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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