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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. const int MOD = 1e9 + 7;
  6.  
  7. int main() {
  8.     ios_base::sync_with_stdio(false);
  9.     cin.tie(0);
  10.     cout.tie(0);
  11.  
  12.     int n, k;
  13.     cin >> n >> k;
  14.  
  15.     vector<int> dp(k + 1);
  16.     dp[0] = 1;
  17.  
  18.     for (int i = 1; i <= k; i++) {
  19.         dp[i] = (dp[i - 1] * 2 + 1) % MOD;
  20.     }
  21.  
  22.     cout << (1LL * dp[k] * n) % MOD;
  23.  
  24.     return 0;
  25. }
  26.  
Success #stdin #stdout 0.01s 5300KB
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https://ideone.com/6vHkvD
language:
C++ (gcc 8.3)
created:
13 days ago
visibility:
public

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