func_code_string: #include <bits/stdc++.h>   using namespace std;   long long sum[2000005];   int main() {     long long n;     double k;     cin >> n >> k;     vector<long long> v;     for (int i = 0; i < n; i++) {       long long a;       cin >> a;       v.push_back(a);     }     for (int i = 1; i <= n; i++) {       sum[i] = sum[i - 1] + v[i - 1];     }     double total = 0;     int go = n - k + 1;     for (int i = 0; i < v.size(); i++) {       if (go + i - 1 == v.size()) {         break;       }       total += (sum[go + i] - sum[i]) / (double)go;     }     printf( %.10llf n , total);   }   