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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. int main() {
  5.     ios::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.     int n, k;
  8.     cin >> n >> k;
  9.     vector<bool> branch(n + 1, false);
  10.     for (int i = 0; i < k; i++) {
  11.         int r;
  12.         cin >> r;
  13.         branch[r] = true;
  14.     }
  15.     ll ans = 0;
  16.     for (int i = 1; i <= n; i++) {
  17.         if (branch[i]) {
  18.             ans = 2 * ans + 2;
  19.         } else {
  20.             ans++;
  21.         }
  22.     }
  23.     cout << ans << '\n';
  24.  
  25.     return 0;
  26. }
Success #stdin #stdout 0s 5308KB
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https://ideone.com/BIiEm8
language:
C++ (gcc 8.3)
created:
5 hours ago
visibility:
public

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