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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. const long long MOD=1e9+7;
  4. long long n;
  5. long long nhan(long long a, long long b, long long c)
  6. {
  7.     if(b==0ll) return 0ll;
  8.     long long t = nhan(a,b/2,c);
  9.     if(b%2==0)
  10.     {
  11.         return (t+t)%c;
  12.     }
  13.     else
  14.     {
  15.         return ((t+t)%c + a%c)%c;
  16.     }
  17. }
  18. long long mu (long long a, long long b, long long c)
  19. {
  20.     if(b==0) return 1ll;
  21.     long long t= mu(a,b/2,c);
  22.     if(b%2==0)
  23.     {
  24.         return nhan(t,t,c);
  25.     }
  26.     else
  27.     {
  28.         return nhan(nhan(t,t,c),a,c);
  29.     }
  30. }
  31. int main()
  32. {
  33.     ios_base::sync_with_stdio(0);
  34.     cin.tie(0);
  35.     cin >> n;
  36.     long long du0 = n/3;
  37.     long long du1= n/3 + (n%3>0);
  38.     long long du2= n/3 + (n%3>1);
  39.     long long ans0= mu(4,du0,MOD);
  40.     long long ans1= mu(3,du1,MOD);
  41.     long long ans2 =mu(3,du2,MOD);
  42.     cout << nhan(nhan(ans0,ans1,MOD),ans2,MOD);
  43. }
  44.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/W780NE
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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