public static void main ( String [ ] args ) throws IOException {
  Reader in = new Reader ( ) ;
  int n = in . nextInt ( ) ;
  int k = in . nextInt ( ) ;
  long [ ] A = new long [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) A [ i ] = in . nextLong ( ) ;
  new MergeSortLong ( ) . sort ( A , 0 , n - 1 ) ;
  int full = n % k ;
  if ( full == 0 ) full = k ;
  int half = k - full ;
  int fullLength = ( n + k - 1 ) / k ;
  int halfLength = fullLength - 1 ;
  long [ ] [ ] dp = new long [ k + 1 ] [ k + 1 ] ;
  for ( int i = 0 ;
  i <= k ;
  i ++ ) Arrays . fill ( dp [ i ] , INF ) ;
  dp [ 0 ] [ 0 ] = 0L ;
  for ( int i = 0 ;
  i <= k ;
  i ++ ) {
    for ( int j = 0 ;
    j <= k ;
    j ++ ) {
      int totalLen = i * fullLength + j * halfLength ;
      if ( totalLen > n ) continue ;
      if ( i > 0 ) {
        long mm = A [ totalLen - 1 ] - A [ totalLen - fullLength ] + dp [ i - 1 ] [ j ] ;
        dp [ i ] [ j ] = Math . min ( dp [ i ] [ j ] , mm ) ;
      }
      if ( j > 0 ) {
        long mm = A [ totalLen - 1 ] - A [ totalLen - halfLength ] + dp [ i ] [ j - 1 ] ;
        dp [ i ] [ j ] = Math . min ( dp [ i ] [ j ] , mm ) ;
      }
    }
  }
  System . out . println ( dp [ full ] [ half ] ) ;
}

public static void main ( String [ ] args ) throws IOException { Reader in = new Reader ( ) ; int n = in . nextInt ( ) ; int k = in . nextInt ( ) ; long [ ] A = new long [ n ] ; for ( int i = 0 ; i < n ; i ++ ) A [ i ] = in . nextLong ( ) ; new MergeSortLong ( ) . sort ( A , 0 , n - 1 ) ; int full = n % k ; if ( full == 0 ) full = k ; int half = k - full ; int fullLength = ( n + k - 1 ) / k ; int halfLength = fullLength - 1 ; long [ ] [ ] dp = new long [ k + 1 ] [ k + 1 ] ; for ( int i = 0 ; i <= k ; i ++ ) Arrays . fill ( dp [ i ] , INF ) ; dp [ 0 ] [ 0 ] = 0L ; for ( int i = 0 ; i <= k ; i ++ ) { for ( int j = 0 ; j <= k ; j ++ ) { int totalLen = i * fullLength + j * halfLength ; if ( totalLen > n ) continue ; if ( i > 0 ) { long mm = A [ totalLen - 1 ] - A [ totalLen - fullLength ] + dp [ i - 1 ] [ j ] ; dp [ i ] [ j ] = Math . min ( dp [ i ] [ j ] , mm ) ; } if ( j > 0 ) { long mm = A [ totalLen - 1 ] - A [ totalLen - halfLength ] + dp [ i ] [ j - 1 ] ; dp [ i ] [ j ] = Math . min ( dp [ i ] [ j ] , mm ) ; } } } System . out . println ( dp [ full ] [ half ] ) ; }
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