1 #include
      
        2 #define eps 0.00000001 3 using namespace std; 4 int a[305][2]; 5 double ccw(int x,int y,int z) 6 { 7     return ((double)(a[y][0]-a[x][0])*(a[z][1]-a[x][1])-(a[y][1]-a[x][1])*(a[z][0]-a[x][0]))*0.5; 8 } 9 double check(double x,double y)10 {11     if(y-x>=eps)12         return y;13     else return x;14 }15 int main()16 {17     int n;18     double ans=0;19     scanf("%d",&n);20     for(int i=0;i
       
        =0&&min>=0)35             ans=check(ans,max+min);36         }37     printf("%lf\n",ans);38     return 0;39 }