def main():
    from math import sqrt,sin,cos,tan,ceil,radians,floor,gcd,exp,log,log10,log2,factorial,fsum
    from heapq import heapify, heappop, heappush
    from bisect import bisect_left, bisect_right
    from copy import deepcopy
    import copy
    import random
    from collections import deque,Counter,defaultdict
    from itertools import permutations,combinations
    from decimal import Decimal,ROUND_HALF_UP
    #tmp = Decimal(mid).quantize(Decimal('0'), rounding=ROUND_HALF_UP)
    from functools import lru_cache, reduce
    #@lru_cache(maxsize=None)
    from operator import add,sub,mul,xor,and_,or_,itemgetter
    INF = 10**18
    mod1 = 10**9+7
    mod2 = 998244353
    
    #DecimalならPython
    #再帰ならPython!!!!!!!!!!!!!!!!!!!!!!!!!!
    
    
    '''
    
    
    
    '''
    
    N,K = map(int, input().split())
    A = list(map(int, input().split()))
    
    A.sort()
    h = INF
    l = -1
    
    while h-l > 1:
        
        m = (h+l)//2
        
        mx = -INF
        mi = INF
        cnt = 0
        for i in range(N):
            mx = max(A[i],mx)
            mi = min(A[i],mi)
            
            if mx-mi > m:
                
                cnt += 1
                mx = A[i]
                mi = A[i]
        cnt += 1
        
        if cnt > K:
            l = m
        else:
            h = m
    
    ans = INF
    for k in range(l,l+500):
        if k < 0:
            continue
        
        mx = -INF
        mi = INF
        cnt = 0
        tmp = 0
        ls = []
        for i in range(N):
            mx = max(A[i],mx)
            mi = min(A[i],mi)
            
            if mx-mi > k:
                cnt += 1
                tmp += max(ls)-min(ls)
                mx = A[i]
                mi = A[i]
                ls = []
            ls.append(A[i])
        
        tmp += max(ls)-min(ls)
        cnt += 1
        
        if cnt == K:
            ans = min(ans,tmp)
    
    print(ans)
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
if __name__ == '__main__':
    main()