#include <bits/stdc++.h>   using namespace std;   int main() {     int n, n1, n2;     scanf( %d%d%d , &n, &n1, &n2);     if (n1 > n2) swap(n1, n2);     vector<double> X;     double x;     for (int i = 0; i < n; i++) {       scanf( %lf , &x);       X.push_back(x);     }     sort(X.begin(), X.end());     double sum1 = 0, sum2 = 0;     for (int i = n - n1 - n2; i < n; i++) {       if (i < n - n1)         sum2 += X[i];       else         sum1 += X[i];     }     sum1 /= n1;     sum2 /= n2;     printf( %.8lf , sum1 + sum2);     return 0;   }   