Buggy python submission (verdict: Time Limit Exceeded):
l,l2 = map(int,input().split())
x = list(map(int,input().split()))

dp = [0]
for i in range(1,l):
    dp.append(dp[i-1]+abs(x[i-1]-x[i]))
    
for i in range(l-1):
    for k in range(1,l2+1):
        if i + k >= l:
            break
        if dp[i+k] !=0:
            dp[i+k] = min(dp[i] + abs(x[i]-x[i+k]),dp[i+k])
        
print(dp[-1])

Fixed submission:
import numpy as np

l,l2 = map(int,input().split())
x = np.array(list(map(int,input().split())))

dp = np.zeros(l,dtype=int)
dp[1] = abs(x[0]-x[1])

for i in range(2,l):
    y = max(i - l2,0)
    dp[i] = np.min(dp[y:i] + abs(x[y:i] - x[i]))
    
print(dp[-1])

Buggy python submission (verdict: Time Limit Exceeded):
l,l2 = map(int,input().split())
x = list(map(int,input().split()))

dp = [0]
for i in range(l-1):
    dp.append(0)
    
for i in range(l-1):
    for k in range(1,l2+1):
        if i + k >= l:
            break
        if dp[i+k] !=0:
            dp[i+k] = min(dp[i] + abs(x[i]-x[i+k]),dp[i+k])
        elif dp[i+k] == 0:
            dp[i+k] = dp[i] + abs(x[i]-x[i+k])
        
print(dp[-1])

Fixed submission:
import numpy as np

l,l2 = map(int,input().split())
x = np.array(list(map(int,input().split())))

dp = np.zeros(l,dtype=int)
dp[1] = abs(x[0]-x[1])

for i in range(2,l):
    y = max(i - l2,0)
    dp[i] = np.min(dp[y:i] + abs(x[y:i] - x[i]))
    
print(dp[-1])

Buggy python submission (verdict: Time Limit Exceeded):
import sys
INF = 1e9 + 5
def solve(n, k, arr):
    dp = [INF] * n
    dp[0] = 0
    for i, _ in enumerate(arr):
        for j in range(i+1, i+k+1):
            if j == n:
                break
            if j < n:
                dp[j] = min(dp[j], dp[i] + abs(arr[j]-arr[i]))
    return dp[-1]

if __name__ == "__main__":
    f = sys.stdin
    fo = sys.stdout
    n, k = map(int, f.readline().split())
    arr = list(map(int, f.readline().split()))
    result = solve(n, k, arr)
    print(result)


Fixed submission:
import sys
INF = 1e9 + 5
def solve(n, k, ls):
    dp = [0] * n
    dp[1] = abs(ls[0]-ls[1])
    for i in range (2,n):
        dp[i] = min(abs(ls[i] - ls[j]) + dp[j] for j in range(max(0,i-k),i))
    return dp[-1]

if __name__ == "__main__":
    f = sys.stdin
    fo = sys.stdout
    n, k = map(int, f.readline().split())
    arr = list(map(int, f.readline().split()))
    result = solve(n, k, arr)
    print(result)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
INF = 1e9 + 5
def solve(n, k, arr):
    dp = [INF] * n
    dp[0] = 0
    for i, _ in enumerate(arr):
        for j in range(i+1, i+k+1):
            if j < n:
                dp[j] = min(dp[j], dp[i] + abs(arr[j]-arr[i]))
    return dp[-1]

if __name__ == "__main__":
    f = sys.stdin
    fo = sys.stdout
    n, k = map(int, f.readline().split())
    arr = list(map(int, f.readline().split()))
    result = solve(n, k, arr)
    print(result)


Fixed submission:
import sys
INF = 1e9 + 5
def solve(n, k, ls):
    dp = [0] * n
    dp[1] = abs(ls[0]-ls[1])
    for i in range (2,n):
        dp[i] = min(abs(ls[i] - ls[j]) + dp[j] for j in range(max(0,i-k),i))
    return dp[-1]

if __name__ == "__main__":
    f = sys.stdin
    fo = sys.stdout
    n, k = map(int, f.readline().split())
    arr = list(map(int, f.readline().split()))
    result = solve(n, k, arr)
    print(result)