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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define optimize()                \
  5.     ios_base::sync_with_stdio(0); \
  6.     cin.tie(0);                   \
  7.     cout.tie(0);
  8.  
  9. typedef long long ll;
  10. typedef double dl;
  11.  
  12. #define endl '\n'
  13. #define yes cout << "YES" << endl
  14. #define no cout << "NO" << endl
  15. #define nl cout << endl
  16.  
  17. ll ans = 0;
  18. ll solve(int n, int m, int i)
  19. {
  20.     if(i > n) return 0;
  21.     int temp; cin >> temp;
  22.     solve(n, m, i+1);
  23.     if(i >= m) ans += temp;
  24.     return ans;
  25. }
  26. int main()
  27. {
  28.     optimize();
  29.  
  30.     int n, m;
  31.     cin >> n >> m;
  32.     ll res = solve(n, m, 1);
  33.     cout << res << endl;
  34.  
  35.     return 0;
  36. }
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/Xwj4TH
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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