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  1. ///nhatnama4k68nq
  2.  
  3. ///---------------------------------------------------------------------
  4. #include <bits/stdc++.h>
  5. using namespace std;
  6.  
  7. #define endl "\n"
  8. #define N 1000005
  9. #define NN 100005
  10. #define MOD 1000000007
  11. #define pb push_back
  12. #define pf push_front
  13. #define fi first
  14. #define se second
  15. #define FOR(i,a,b) for (int i = (a); i < (b); i++)
  16. #define FORd(i,a,b) for (int i = (a) - 1; i >= (b); i--)
  17.  
  18. ///---------------------------------------------------------------------
  19.  
  20.  
  21. typedef long long ll;
  22. typedef unsigned long long ull;
  23. typedef pair<int,int> pii;
  24. typedef vector<int> vi;
  25. typedef vector<pair<int,int>> vii;
  26.  
  27. ///---------------------------------------------------------------------
  28.  
  29. const int maxint = 1e9+ 1608;
  30. const long long maxll = 1e18+ 16082009;
  31.  
  32. ///---------------------------------------------------------------------
  33.  
  34. /**
  35. ------------------------------------------------------------------------
  36.  
  37.  
  38.                              NHAT NAM A4K68NQ
  39.  
  40.  
  41. ------------------------------------------------------------------------
  42. */
  43.  
  44. ll a;
  45.  
  46. void Read(){
  47.     cin >> a;
  48. }
  49.  
  50.  
  51. void Solve(){
  52.     cout << fixed << setprecision(2) << a*a/4.00 << endl;
  53. }
  54.  
  55. int main(){
  56.     int t = 1;
  57.     while (t--){
  58.         Read();
  59.         Solve();
  60.     }
  61. return 0;
  62. }
  63.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/rNxsPn
language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

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