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  1. #include <bits/stdc++.h>
  2. typedef long long int ll;
  3. using namespace std;
  4.  
  5. class s {
  6. public:
  7.     ll sm(ll n) {
  8.         if(n==0) return 0;
  9.         return n+sm(n-1);
  10.     }
  11. };
  12.  
  13. int main() {
  14.     ll n;
  15.     cin>>n;
  16.     s sol;
  17.     cout<<sol.sm(n)<<endl;
  18.     return 0;
  19. }
  20.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/jeezt2
5
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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