Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10 ** 7)

def solve(index: int, dp: list, footing: list, K: int) -> int:
    if dp[index] != -1:
        return dp[index]

    if index == 0:
        return 0
    elif index == 1:
        return abs(footing[1]-footing[0])

    tmp = 10 ** 10
    for k in range(1, min(K+1,index+1)):
        tmp = min(tmp, solve(index-k, dp, footing, K)+abs(footing[index]-footing[index-k]))

    #print(f'{tmp=}')
    dp[index] = tmp
    return tmp

N, K  = map(int, input().split())
footing = list(map(int, input().split()))

dp = [-1] * N

ans = solve(N-1, dp, footing, K)

print(ans)


Fixed submission:
N, K = map(int, input().split())
footing = list(map(int, input().split()))


dp = [10 ** 10] * N
dp = dp + [10 ** 10] * 1000
dp[0] = 0

footing = footing + [0] * 1000
# give
'''
for i in range(N-1):
    for k in range(1, K+1):
        if dp[i+k] > dp[i] + abs(footing[i+k] - footing[i]):
            dp[i+k] = dp[i] + abs(footing[i+k] - footing[i])

print(dp[N-1])
'''
# get
for i in range(1,N):
    for j in range(1,min(K+1, i+1)): 
        dp[i] = min(dp[i],dp[i-j] + abs(footing[i]-footing[i-j])) 

print(dp[N-1])

Buggy python submission (verdict: Time Limit Exceeded):

N, K = map(int, input().split())
footing = list(map(int, input().split()))


dp = [10 ** 10] * N
dp = dp + [10 ** 10] * 1000
dp[0] = 0

footing = footing + [0] * 1000
# give
'''
for i in range(N-1):
    for k in range(1, K+1):
        if dp[i+k] > dp[i] + abs(footing[i+k] - footing[i]):
            dp[i+k] = dp[i] + abs(footing[i+k] - footing[i])

print(dp[N-1])
'''
# get
for i in range(1,N):
    for j in range(1,min(K+1, i+1)): 
        dp[i] = min(dp[i],dp[i-j] + abs(footing[i]-footing[i-j])) 

print(dp[N-1])

Fixed submission:
N, K = map(int, input().split())
footing = list(map(int, input().split()))


dp = [10 ** 10] * N
dp = dp + [10 ** 10] * 1000
dp[0] = 0

footing = footing + [0] * 1000
# give
'''
for i in range(N-1):
    for k in range(1, K+1):
        if dp[i+k] > dp[i] + abs(footing[i+k] - footing[i]):
            dp[i+k] = dp[i] + abs(footing[i+k] - footing[i])

print(dp[N-1])
'''
# get
for i in range(1,N):
    for j in range(1,min(K+1, i+1)): 
        dp[i] = min(dp[i],dp[i-j] + abs(footing[i]-footing[i-j])) 

print(dp[N-1])

Buggy python submission (verdict: Time Limit Exceeded):

N, K = map(int, input().split())
footing = list(map(int, input().split()))


dp = [10 ** 10] * N
dp = dp + [10 ** 10] * 1000
dp[0] = 0

footing = footing + [0] * 1000
# give
'''
for i in range(N-1):
    for k in range(1, K+1):
        if dp[i+k] > dp[i] + abs(footing[i+k] - footing[i]):
            dp[i+k] = dp[i] + abs(footing[i+k] - footing[i])

print(dp[N-1])
'''
# get
for i in range(1,N):
    for j in range(1,min(K+1, i+1)): 
        if dp[i] > dp[i-j] + abs(footing[i]-footing[i-j]):
            dp[i] = dp[i-j] + abs(footing[i]-footing[i-j]) 

print(dp[N-1])

Fixed submission:
N, K = map(int, input().split())
footing = list(map(int, input().split()))


dp = [10 ** 10] * N
dp = dp + [10 ** 10] * 1000
dp[0] = 0

footing = footing + [0] * 1000
# give
'''
for i in range(N-1):
    for k in range(1, K+1):
        if dp[i+k] > dp[i] + abs(footing[i+k] - footing[i]):
            dp[i+k] = dp[i] + abs(footing[i+k] - footing[i])

print(dp[N-1])
'''
# get
for i in range(1,N):
    for j in range(1,min(K+1, i+1)): 
        dp[i] = min(dp[i],dp[i-j] + abs(footing[i]-footing[i-j])) 

print(dp[N-1])

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10 ** 7)

def solve(index: int, dp: list, footing: list, K: int) -> int:
    if dp[index] != -1:
        return dp[index]

    if index == 0:
        return 0
    elif index == 1:
        return abs(footing[1]-footing[0])

    tmp = 10 ** 10
    for k in range(1, min(K+1,index+1)):
        tmp = min(tmp, solve(index-k, dp, footing, K)+abs(footing[index]-footing[index-k]))

    #print(f'{tmp=}')
    dp[index] = tmp
    return tmp

N, K  = map(int, input().split())
footing = list(map(int, input().split()))

dp = [-1] * N

ans = solve(N-1, dp, footing, K)

print(ans)

Fixed submission:
N, K = map(int, input().split())
footing = list(map(int, input().split()))


dp = [10 ** 10] * N
dp = dp + [10 ** 10] * 1000
dp[0] = 0

footing = footing + [0] * 1000
# give
'''
for i in range(N-1):
    for k in range(1, K+1):
        if dp[i+k] > dp[i] + abs(footing[i+k] - footing[i]):
            dp[i+k] = dp[i] + abs(footing[i+k] - footing[i])

print(dp[N-1])
'''
# get
for i in range(1,N):
    for j in range(1,min(K+1, i+1)): 
        dp[i] = min(dp[i],dp[i-j] + abs(footing[i]-footing[i-j])) 

print(dp[N-1])

Buggy python submission (verdict: Time Limit Exceeded):

N, K = map(int, input().split())
footing = list(map(int, input().split()))


dp = [10 ** 10] * N
dp = dp + [10 ** 10] * 1000
dp[0] = 0

footing = footing + [0] * 1000
# give
for i in range(N-1):
    for k in range(1, K+1):
        if dp[i+k] > dp[i] + abs(footing[i+k] - footing[i]):
            dp[i+k] = dp[i] + abs(footing[i+k] - footing[i])

print(dp[N-1])

# get
'''
for i in range(1,N):
    if dp[i] > dp[i-1] + abs(footing[i]-footing[i-1]):
        dp[i] = dp[i-1] + abs(footing[i]-footing[i-1]) 

    for j in range(2,K+1): 
        if i >= j:
            if dp[i] > dp[i-j] + abs(footing[i]-footing[i-j]):
                dp[i] = dp[i-j] + abs(footing[i]-footing[i-j]) 

print(dp[N-1])
'''

Fixed submission:
N, K = map(int, input().split())
footing = list(map(int, input().split()))


dp = [10 ** 10] * N
dp = dp + [10 ** 10] * 1000
dp[0] = 0

footing = footing + [0] * 1000
# give
'''
for i in range(N-1):
    for k in range(1, K+1):
        if dp[i+k] > dp[i] + abs(footing[i+k] - footing[i]):
            dp[i+k] = dp[i] + abs(footing[i+k] - footing[i])

print(dp[N-1])
'''
# get
for i in range(1,N):
    for j in range(1,min(K+1, i+1)): 
        dp[i] = min(dp[i],dp[i-j] + abs(footing[i]-footing[i-j])) 

print(dp[N-1])

Buggy python submission (verdict: Time Limit Exceeded):
N, K = map(int, input().split())
footing = list(map(int, input().split()))


dp = [10 ** 10] * N
dp[0] = 0

# give
'''
for i in range(N-1):
    if dp[i+1] > dp[i] + abs(footing[i+1] - footing[i]):
        dp[i+1] = dp[i] + abs(footing[i+1] - footing[i])

    if i < N-2:
        if dp[i+2] > dp[i] + abs(footing[i+2] - footing[i]):
            dp[i+2] = dp[i] + abs(footing[i+2] - footing[i])

print(dp[N-1])
'''
# get

for i in range(1,N):
    if dp[i] > dp[i-1] + abs(footing[i]-footing[i-1]):
        dp[i] = dp[i-1] + abs(footing[i]-footing[i-1]) 

    for j in range(2,K+1): 
        if i >= j:
            if dp[i] > dp[i-j] + abs(footing[i]-footing[i-j]):
                dp[i] = dp[i-j] + abs(footing[i]-footing[i-j]) 

print(dp[N-1])

Fixed submission:
N, K = map(int, input().split())
footing = list(map(int, input().split()))


dp = [10 ** 10] * N
dp = dp + [10 ** 10] * 1000
dp[0] = 0

footing = footing + [0] * 1000
# give
'''
for i in range(N-1):
    for k in range(1, K+1):
        if dp[i+k] > dp[i] + abs(footing[i+k] - footing[i]):
            dp[i+k] = dp[i] + abs(footing[i+k] - footing[i])

print(dp[N-1])
'''
# get
for i in range(1,N):
    for j in range(1,min(K+1, i+1)): 
        dp[i] = min(dp[i],dp[i-j] + abs(footing[i]-footing[i-j])) 

print(dp[N-1])