#include <bits/stdc++.h>
#define int long long
using namespace std;

int a[100010], w[1010][1010], dp[1010][1010], tr[1010][1010];

signed main(){
    int n, K;
    cin >> n >> K;
    for(int i=0;i<n;i++) cin >> a[i];
    sort(a, a+n);

    for(int i=0;i<n;i++) {
        for(int j=i+1;j<n;j++) {
            int mid = i + j >> 1;
            w[i][j] = w[i][j-1] + a[j] - a[mid];
        }
    }

    for(int i=0;i<n;i++) {
        dp[0][i] = w[0][i];
    }

    for(int i=1;i<K;i++) {
        for(int j=n-1;j>=i;j--){
            dp[i][j] = 1e18;
            for(int k=tr[i-1][j];k<=tr[i][j+1];k++) {
                int tmp = dp[i-1][k] + w[k+1][j];
                if(dp[i][j] > tmp) {
                    dp[i][j] = tmp, tr[i][j] = k;
                }
            }
        }
    }

    cout << dp[K-1][n-1] << endl;
}