Buggy python submission (verdict: Runtime Error):
from sys import stdin, gettrace
import sys
 
if not gettrace():
    def input():
        return next(stdin)[:-1]
 
 
# def input():
#    return stdin.buffer.readline()
 
def mincost(n,h,k):
    	dp=[-1 for i in range(n)]
    	dp[n-1]=0
    	dp[n-2]=abs(h[n-2]-h[n-1])
    	for i in range(n-3,-1,-1):
        	mn=min(i+k+1,n)
        	mnm=sys.maxsize
        	for j in range(i+1,mn):
            	mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
        	dp[i]=mnm    
    	return dp[0]

def main():
	n,k=map(int,input().split())
	h=[int(x) for x in input().split()]
	print(mincost(n,h,k)) 
 
if __name__ == "__main__":
    main()

Fixed submission:
from sys import stdin, gettrace
import sys
 
if not gettrace():
    def input():
        return next(stdin)[:-1]
 
 
# def input():
#    return stdin.buffer.readline()
 
def mincost(n,h,k):
  dp=[-1 for i in range(n)]
  dp[n-1]=0
  dp[n-2]=abs(h[n-2]-h[n-1])
  for i in range(n-3,-1,-1):
    mn=min(i+k+1,n)
    mnm=sys.maxsize
    for j in range(i+1,mn):
      mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
    dp[i]=mnm    
  return dp[0]
 
def main():
  n,k=map(int,input().split())
  h=[int(x) for x in input().split()]
  print(mincost(n,h,k)) 
 
if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
from sys import stdin, gettrace
import sys
 
if not gettrace():
    def input():
        return next(stdin)[:-1]
 
 
# def input():
#    return stdin.buffer.readline()
 
def main():
    def mincost(n,h):
    	dp=[-1 for i in range(n)]
    	dp[n-1]=0
    	dp[n-2]=abs(h[n-2]-h[n-1])
    	for i in range(n-3,-1,-1):
        	mn=min(i+k+1,n)
        	mnm=sys.maxsize
        	for j in range(i+1,mn):
            	mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
        	dp[i]=mnm    
    	return dp[0]
    
    n,k=map(int,input().split())
    h=[int(x) for x in input().split()]
    print(mincost(n,h))
 
 
if __name__ == "__main__":
    main()

Fixed submission:
from sys import stdin, gettrace
import sys
 
if not gettrace():
    def input():
        return next(stdin)[:-1]
 
 
# def input():
#    return stdin.buffer.readline()
 
def mincost(n,h,k):
  dp=[-1 for i in range(n)]
  dp[n-1]=0
  dp[n-2]=abs(h[n-2]-h[n-1])
  for i in range(n-3,-1,-1):
    mn=min(i+k+1,n)
    mnm=sys.maxsize
    for j in range(i+1,mn):
      mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
    dp[i]=mnm    
  return dp[0]
 
def main():
  n,k=map(int,input().split())
  h=[int(x) for x in input().split()]
  print(mincost(n,h,k)) 
 
if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
from sys import stdin, gettrace
import sys
 
if not gettrace():
    def input():
        return next(stdin)[:-1]
 
 
# def input():
#    return stdin.buffer.readline()
 
def main():
    def mincost(n,h):
    	dp=[-1 for i in range(n)]
    	dp[n-1]=0
    	dp[n-2]=abs(h[n-2]-h[n-1])
    	for i in range(n-3,-1,-1):
        	mn=min(i+k+1,n)
        	mnm=sys.maxsize
        	for j in range(i+1,mn):
            	mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
        	dp[i]=mnm    
    	return dp[0]
 
	n,k=map(int,input().split())
	h=[int(x) for x in input().split()]
	print(mincost(n,h))
 
 
if __name__ == "__main__":
    main()

Fixed submission:
from sys import stdin, gettrace
import sys
 
if not gettrace():
    def input():
        return next(stdin)[:-1]
 
 
# def input():
#    return stdin.buffer.readline()
 
def mincost(n,h,k):
  dp=[-1 for i in range(n)]
  dp[n-1]=0
  dp[n-2]=abs(h[n-2]-h[n-1])
  for i in range(n-3,-1,-1):
    mn=min(i+k+1,n)
    mnm=sys.maxsize
    for j in range(i+1,mn):
      mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
    dp[i]=mnm    
  return dp[0]
 
def main():
  n,k=map(int,input().split())
  h=[int(x) for x in input().split()]
  print(mincost(n,h,k)) 
 
if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
from sys import stdin, gettrace
import sys
 
if not gettrace():
    def input():
        return next(stdin)[:-1]
 
 
# def input():
#    return stdin.buffer.readline()
 
def main():
    def mincost(n,h):
    	dp=[-1 for i in range(n)]
    	dp[n-1]=0
    	dp[n-2]=abs(h[n-2]-h[n-1])
    	for i in range(n-3,-1,-1):
        	mn=min(i+k+1,n)
        	mnm=sys.maxsize
        	for j in range(i+1,mn):
            	mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
        	dp[i]=mnm    
    	return dp[0]
 
	n,k=map(int,input().split())
	h=[int(x) for x in input().split()]
	print(mincost(n,h))
 
 
if __name__ == "__main__":
    main()

Fixed submission:
from sys import stdin, gettrace
import sys
 
if not gettrace():
    def input():
        return next(stdin)[:-1]
 
 
# def input():
#    return stdin.buffer.readline()
 
def mincost(n,h,k):
  dp=[-1 for i in range(n)]
  dp[n-1]=0
  dp[n-2]=abs(h[n-2]-h[n-1])
  for i in range(n-3,-1,-1):
    mn=min(i+k+1,n)
    mnm=sys.maxsize
    for j in range(i+1,mn):
      mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
    dp[i]=mnm    
  return dp[0]
 
def main():
  n,k=map(int,input().split())
  h=[int(x) for x in input().split()]
  print(mincost(n,h,k)) 
 
if __name__ == "__main__":
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
def mincost(n,h):
    dp=[-1 for i in range(n)]
    dp[n-1]=0
    dp[n-2]=abs(h[n-2]-h[n-1])
    for i in range(n-3,-1,-1):
        mn=min(i+k+1,n)
        mnm=sys.maxsize
        for j in range(i+1,mn):
            mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
        dp[i]=mnm    
    return dp[0]

n,k=map(int,input().split())
h=[int(x) for x in input().split()]
print(mincost(n,h))

Fixed submission:
from sys import stdin, gettrace
import sys
 
if not gettrace():
    def input():
        return next(stdin)[:-1]
 
 
# def input():
#    return stdin.buffer.readline()
 
def mincost(n,h,k):
  dp=[-1 for i in range(n)]
  dp[n-1]=0
  dp[n-2]=abs(h[n-2]-h[n-1])
  for i in range(n-3,-1,-1):
    mn=min(i+k+1,n)
    mnm=sys.maxsize
    for j in range(i+1,mn):
      mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
    dp[i]=mnm    
  return dp[0]
 
def main():
  n,k=map(int,input().split())
  h=[int(x) for x in input().split()]
  print(mincost(n,h,k)) 
 
if __name__ == "__main__":
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(1000000)
def mincost(n,h,i,dp,k):
    if i==(n-1):
        return 0
    elif i==(n-2):
        return abs(h[n-1]-h[i])
    mncost=sys.maxsize
    mn=min(i+k+1,n)
    for j in range(i+1,mn):
        if dp[j]==-1:
            cost=mincost(n,h,j,dp,k)
            dp[j]=cost
        else:
            cost=dp[j]
        mncost=min(mncost,cost+abs(h[j]-h[i]))
    return mncost

n,k=map(int,input().split())
h=[int(x) for x in input().split()]
dp=[-1 for i in range(n)]
print(mincost(n,h,0,dp,k))

Fixed submission:
from sys import stdin, gettrace
import sys
 
if not gettrace():
    def input():
        return next(stdin)[:-1]
 
 
# def input():
#    return stdin.buffer.readline()
 
def mincost(n,h,k):
  dp=[-1 for i in range(n)]
  dp[n-1]=0
  dp[n-2]=abs(h[n-2]-h[n-1])
  for i in range(n-3,-1,-1):
    mn=min(i+k+1,n)
    mnm=sys.maxsize
    for j in range(i+1,mn):
      mnm=min(dp[j]+abs(h[j]-h[i]),mnm)
    dp[i]=mnm    
  return dp[0]
 
def main():
  n,k=map(int,input().split())
  h=[int(x) for x in input().split()]
  print(mincost(n,h,k)) 
 
if __name__ == "__main__":
    main()