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  1. #include <iostream>
  2. #include <cstdio>
  3. #include <iostream>
  4. #include <vector>
  5. #include <algorithm>
  6.  
  7. using namespace std;
  8.  
  9. vector <long long> V;
  10.  
  11. int main()
  12. {
  13.     int n, m;
  14.     scanf("%d %d", &n, &m);
  15.     unsigned long long ans = 0;
  16.     long long x;
  17.     for (int i=1; i<=n; i++)
  18.     {
  19.         scanf("%lld", &x);
  20.         V.push_back(x);
  21.     }
  22.     long long med = V[n/2];
  23.     int pos = 0;
  24.     while (pos < n/2)
  25.     {
  26.         ans += (abs(V[pos]-med) * 2);
  27.         pos += m;
  28.     }
  29.     pos = V.size()-1;
  30.     while (pos > n/2)
  31.     {
  32.         ans += (abs(V[pos]-med) * 2);
  33.         pos -= m;
  34.     }
  35.     printf("%lld\n", ans);
  36.     return 0;
  37. }
Success #stdin #stdout 0s 3476KB
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https://ideone.com/H9W9tP
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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