fork download
copy 
  1. //----->|try=0; while(!success) try++;|<------
  2. //----->|Belief Yourself,Respect Yourself|<----
  3. //----->|Be Proud Of Yourself,You're Doing Your best|<-----
  4. #include<bits/stdc++.h>
  5. using namespace std;
  6. #define uniq(x)  x.erase(unique(x.begin(),x.end()), x.end()) //Unique value find from vector
  7. #define upper(arr,n,fixed) upper_bound(arr,arr+n,fixed)-arr  //Upper value search;
  8. #define lower(arr,n,fixed) upper_bound(arr,arr+n,fixed)-arr  //Lower value search;
  9. #define max3(a,b,c) max(max(a,b),c)//maximum value find three value;
  10. #define min3(a,b,c) min(min(a,b),c)//minimum value find three value;
  11. #define PI acos(-1.0)//PI Calculation
  12. #define LL long long
  13. #define AND(a,b) ((a) & (b))
  14. #define OR(a,b) ((a)|(b))
  15. #define XOR(a,b) ((a) ^ (b))
  16. #define mp make_pair
  17. #define sqr(x) ((x)*(x))
  18. #define sqrt(x) sqrt(1.0*(x))
  19. #define INF_MAX 2147483647
  20. #define INF_MIN -2147483647
  21. #define MX 1000005
  22. #define MOD 1000000007
  23. template<typename T> T POW(T b,T p)          //Pow calculation
  24. {
  25.     T r=1;
  26.     while(p)
  27.     {
  28.         if(p&1)r=(r*b);
  29.         b=(b*b);
  30.         p>>=1;
  31.     }
  32.     return r;
  33. }
  34.  
  35. int main()
  36. {
  37.     //freopen("a.in", "r", stdin);
  38.     //freopen("a.out", "w", stdout);
  39.     double n,square_sum,odd_sum,average,res;
  40.     while(scanf("%lf",&n) && n!=0)
  41.     {
  42.         square_sum=(4*n*n*n-n)/3;//finding odd square sum to 1 - n;
  43.         odd_sum=n*n;//finding odd sum 1 to n; 
  44.         average=odd_sum*1.f/n;//finding average
  45.         res=sqrt((square_sum-2*odd_sum*average+average*average*n)*1.f/(n-1));//finding standard devation;
  46.         printf("%.6lf\n",res);
  47.     }
  48. }
  49.  
  50.  
  51.  
Success #stdin #stdout 0s 3472KB
comments (?)
stdin
copy 
10
100
1000
10000
100000
1000000
0
stdout
copy 
6.055301
58.022984
577.638872
5773.791360
57735.315593
577350.557865
https://ideone.com/yKZDu5
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!