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  1. #include <iostream>
  2. #include <iomanip>
  3. #define _USE_MATH_DEFINES
  4. #include <cmath>
  5. #define M_PI       3.14159265358979323846
  6.  
  7. using namespace std;
  8.  
  9. int main()
  10. {
  11.     long long n,k,x,y;
  12.     long double p,a,b,c;
  13.     cin>>n>>k;
  14.     long double tab[n][2];
  15.     for(int i=0; i<n; i++)
  16.     {
  17.         for(int j=0; j<2; j++)
  18.         {
  19.             cin>>tab[i][j];
  20.             tab[i][j]*=1.0;
  21.         }
  22.     }
  23.     if(tab[0][0]!=0&&tab[0][1]!=0)
  24.     {
  25.         x=tab[0][0];
  26.         y=tab[0][1];
  27.         for(int i=0; i<n; i++)
  28.         {
  29.             for(int j=0; j<2; j++)
  30.             {
  31.                 if(j==0)
  32.                     tab[i][j]-=x;
  33.                 else if(j==1)
  34.                     tab[i][j]-=y;
  35.             }
  36.         }
  37.     }
  38.     if(n==4)
  39.     {
  40.         a=sqrt(tab[1][0]*tab[1][0]+tab[1][1]*tab[1][1]);
  41.         b=sqrt(tab[3][0]*tab[3][0]+tab[3][1]*tab[3][1]);
  42.         p=a*b;
  43.         p=p+2*(a*k)+2*(b*k)+M_PI*k*k;
  44.         cout<<fixed;
  45.         cout<<setprecision(6)<<p;
  46.     }
  47.     else if(n==3)
  48.     {
  49.         a=sqrt(tab[1][0]*tab[1][0]+tab[1][1]*tab[1][1]);
  50.         b=sqrt(tab[2][0]*tab[2][0]+tab[2][1]*tab[2][1]);
  51.         tab[2][0]-=tab[2][0];
  52.         tab[2][1]-=tab[2][1];
  53.         tab[1][0]-=tab[2][0];
  54.         tab[1][1]-=tab[2][1];
  55.         c=sqrt(tab[1][0]*tab[1][0]+tab[1][1]*tab[1][1]);
  56.         p=sqrt((a+b+c)/2*((a+b+c)/2-a)*((a+b+c)/2-b)*((a+b+c)/2-c));
  57.         p=p+k*a+k*b+k*c+M_PI*k*k;
  58.         cout<<fixed;
  59.         cout<<setprecision(6)<<p;
  60.     }
  61.     return 0;
  62. }
Success #stdin #stdout 0s 4528KB
comments (?)
stdin
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4 1000000000
0 0
0 1
1 1
1 0
stdout
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3141592657589793281.000000
https://ideone.com/AOaf7O
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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