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Repost from 「 Eyu core 」
Enjoy but don't get attached Give but dont expect Listen but dont judge Love but not depend and finally accept but dont settle
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Don't ever save anything for a special occasion. Being alive is the special occasion.
— Mary Engelbreit
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n, k = list(map(int, input().split()))
arr = list(map(int, input().split()))
bu = [0] * n
for i in range(len(arr) - 2, -1, -1):
bu[i] = abs(arr[i] - arr[i + 1]) + bu[i + 1]
for j in range(i + 2, min(i + k + 1, len(arr))):
bu[i] = min(abs(arr[i] - arr[j]) + bu[j], bu[i])
