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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. #define YES cout << "YES\n";
  4. #define NO cout << "NO\n";
  5. #define opps cout<<-1<<endl;
  6. const ll con = 1e10 + 5;
  7. using namespace std;
  8. class rectangle {
  9.     double height ;
  10.     double width ;
  11.     public:
  12.     rectangle();
  13.     double get_area() ;
  14.     double get_perimeter() ;
  15.     double get_height() ;
  16.     double get_width() ;
  17.     void set_width(double width_) ;
  18.     void set_height(double height_) ;
  19. };
  20. rectangle::rectangle() {
  21.     width = height = 0;
  22. }
  23. double rectangle::get_area() {
  24.     return width * height;
  25. }
  26. double rectangle::get_perimeter() {
  27.     return width + height ;
  28. }
  29. double rectangle::get_height() {
  30.     return height;
  31. }
  32. double rectangle::get_width() {
  33.     return width;
  34. }
  35. void rectangle::set_height(double height_) {
  36.     height = height_;
  37. }
  38. void rectangle::set_width(double width_) {
  39.     width = width_;
  40. }
  41. int main() {
  42.     ios::sync_with_stdio(0);
  43.     cin.tie(0);
  44.     ll n ;
  45.     cin>>n;
  46.     ll sum = ((n * (n+1)) / 2);
  47.     cout<<sum;
  48. }
Success #stdin #stdout 0s 5320KB
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1730353505058913928
https://ideone.com/XFSHCa
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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