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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define mod 1000000007
  5. ll po(ll a, ll n)
  6. {
  7.         ll res = a, ans = 1;
  8.         while (n)
  9.         {
  10.                 if (n % 2)
  11.                         ans = ans * res % mod;
  12.                 res = res * res % mod;
  13.                 n /= 2;
  14.         }
  15.         return ans;
  16. }
  17. int main()
  18. {
  19.         ll n;
  20.         cin >> n;
  21.         cout << po(3, n - 1);
  22.         return 0;
  23. }
Success #stdin #stdout 0s 4900KB
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https://ideone.com/I8ltsV
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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