Buggy python submission (verdict: Time Limit Exceeded):
def solve():
    h, k = read()
    result = think(h, k)
    write(result)


def read():
    n, k = read_int(2)
    return read_int(n), k


def read_int(n):
    return list(map(lambda x: int(x), read_line().split(' ')))[:n]


def read_line(n=0):
    if n == 0:
        return input().rstrip()
    else:
        return input().rstrip()[:n]


def think(h, k):
    cost = [0 for x in range(len(h))]
    # element of h <= 10 ** 4, elements <= 10 ** 5, +1 in case
    initial_value_of_cost = 10 ** (4 + 5) + 1
    n = len(h)
    for dst in range(1, n):
        minimum_cost = initial_value_of_cost
        start_point = max(0, dst - k)
        for src in range(start_point, dst):
            minimum_cost = min(minimum_cost, cost[src] + abs(h[src] - h[dst]))
        cost[dst] = minimum_cost
    return cost[n - 1]


def write(result):
    print(result)


if __name__ == '__main__':
    solve()

Fixed submission:
def solve():
    h, k = read()
    result = think(h, k)
    write(result)


def read():
    n, k = read_int(2)
    return read_int(n), k


def read_int(n):
    return list(map(lambda x: int(x), read_line().split(' ')))[:n]


def read_line(n=0):
    if n == 0:
        return input().rstrip()
    else:
        return input().rstrip()[:n]


def think(h, k):
    cost = [0 for x in range(len(h))]
    for dst in range(1, len(h)):
        start_point = max(0, dst - k)
        cost[dst] = min([cost[src] + abs(h[src] - h[dst]) for src in range(start_point, dst)])
    return cost[len(h) - 1]


def write(result):
    print(result)


if __name__ == '__main__':
    solve()

Buggy python submission (verdict: Time Limit Exceeded):
def solve():
    h, k = read()
    result = think(h, k)
    write(result)


def read():
    n, k = read_int(2)
    return read_int(n), k


def read_int(n):
    return list(map(lambda x: int(x), read_line().split(' ')))[:n]


def read_line(n=0):
    if n == 0:
        return input().rstrip()
    else:
        return input().rstrip()[:n]


def think(h, k):
    cost = [0 for x in range(len(h))]
    # element of h <= 10 ** 4, elements <= 10 ** 5, +1 in case
    initial_value_of_cost = 10 ** (4 + 5) + 1
    n = len(h)
    for dst in range(1, n):
        minimum_cost = initial_value_of_cost
        for src in range(max(0, dst - k), dst):
            minimum_cost = min(minimum_cost, cost[src] + abs(h[src] - h[dst]))
        cost[dst] = minimum_cost
    return cost[n - 1]


def write(result):
    print(result)


if __name__ == '__main__':
    solve()

Fixed submission:
def solve():
    h, k = read()
    result = think(h, k)
    write(result)


def read():
    n, k = read_int(2)
    return read_int(n), k


def read_int(n):
    return list(map(lambda x: int(x), read_line().split(' ')))[:n]


def read_line(n=0):
    if n == 0:
        return input().rstrip()
    else:
        return input().rstrip()[:n]


def think(h, k):
    cost = [0 for x in range(len(h))]
    for dst in range(1, len(h)):
        start_point = max(0, dst - k)
        cost[dst] = min([cost[src] + abs(h[src] - h[dst]) for src in range(start_point, dst)])
    return cost[len(h) - 1]


def write(result):
    print(result)


if __name__ == '__main__':
    solve()

Buggy python submission (verdict: Time Limit Exceeded):
def solve():
    h, k = read()
    result = think(h, k)
    write(result)


def read():
    n, k = read_int(2)
    return read_int(n), k


def read_int(n):
    return list(map(lambda x: int(x), read_line().split(' ')))[:n]


def read_line(n=0):
    if n == 0:
        return input().rstrip()
    else:
        return input().rstrip()[:n]


def think(h, k):
    cost = [0 for x in range(len(h))]
    # element of h <= 10 ** 4, elements <= 10 ** 5, +1 in case
    initial_value_of_cost = 10 ** (4 + 5) + 1
    for dst in range(1, len(h)):
        minimum_cost = initial_value_of_cost
        for src in range(max(0, dst - k), dst):
            minimum_cost = min(minimum_cost, cost[src] + abs(h[src] - h[dst]))
        cost[dst] = minimum_cost
    return cost[len(h) - 1]


def write(result):
    print(result)


if __name__ == '__main__':
    solve()

Fixed submission:
def solve():
    h, k = read()
    result = think(h, k)
    write(result)


def read():
    n, k = read_int(2)
    return read_int(n), k


def read_int(n):
    return list(map(lambda x: int(x), read_line().split(' ')))[:n]


def read_line(n=0):
    if n == 0:
        return input().rstrip()
    else:
        return input().rstrip()[:n]


def think(h, k):
    cost = [0 for x in range(len(h))]
    for dst in range(1, len(h)):
        start_point = max(0, dst - k)
        cost[dst] = min([cost[src] + abs(h[src] - h[dst]) for src in range(start_point, dst)])
    return cost[len(h) - 1]


def write(result):
    print(result)


if __name__ == '__main__':
    solve()

Buggy python submission (verdict: Time Limit Exceeded):
def solve():
    h, k = read()
    result = think(h, k)
    write(result)


def read():
    n, k = read_int(2)
    return read_int(n), k


def read_int(n):
    return list(map(lambda x: int(x), read_line().split(' ')))[:n]


def read_line(n=0):
    if n == 0:
        return input().rstrip()
    else:
        return input().rstrip()[:n]


def think(h, k):
    cache = preprocess(h, k)
    cost = [0 for x in range(len(h))]
    # element of h <= 10 ** 4, elements <= 10 ** 5, +1 in case
    initial_value_of_cost = 10 ** (4 + 5) + 1
    for dst in range(1, len(h)):
        minimum_cost = initial_value_of_cost
        for src in range(max(0, dst - k), dst):
            minimum_cost = min(minimum_cost, cost[src] + cache[src][dst])
        cost[dst] = minimum_cost
    return cost[len(h) - 1]


def preprocess(h, k):
    cache = [[0 for x in range(len(h))] for y in range(len(h))]
    for src in range(len(h) - 1):
        for dst in range(src + 1, min(len(h), src + k + 1)):
            cost = abs(h[src] - h[dst])
            cache[src][dst] = cost
    return cache


def write(result):
    print(result)


if __name__ == '__main__':
    solve()

Fixed submission:
def solve():
    h, k = read()
    result = think(h, k)
    write(result)


def read():
    n, k = read_int(2)
    return read_int(n), k


def read_int(n):
    return list(map(lambda x: int(x), read_line().split(' ')))[:n]


def read_line(n=0):
    if n == 0:
        return input().rstrip()
    else:
        return input().rstrip()[:n]


def think(h, k):
    cost = [0 for x in range(len(h))]
    for dst in range(1, len(h)):
        start_point = max(0, dst - k)
        cost[dst] = min([cost[src] + abs(h[src] - h[dst]) for src in range(start_point, dst)])
    return cost[len(h) - 1]


def write(result):
    print(result)


if __name__ == '__main__':
    solve()

Buggy python submission (verdict: Time Limit Exceeded):
def solve():
    h, k = read()
    result = think(h, k)
    write(result)


def read():
    n, k = read_int(2)
    return read_int(n), k


def read_int(n):
    return list(map(lambda x: int(x), read_line().split(' ')))[:n]


def read_line(n=0):
    if n == 0:
        return input().rstrip()
    else:
        return input().rstrip()[:n]


def think(h, k):
    cache = preprocess(h, k)
    cost = [0 for x in range(len(h))]
    # element of h <= 10 ** 4, elements <= 10 ** 5, +1 in case
    initial_value_of_cost = 10 ** (4 + 5) + 1
    for dst in range(1, len(h)):
        minimum_cost = initial_value_of_cost
        for src in range(max(0, dst - k), dst):
            minimum_cost = min(minimum_cost, cost[src] + cache[create_key_for_cache(src, dst)])
        cost[dst] = minimum_cost
    return cost[len(h) - 1]


def preprocess(h, k):
    cache = {}
    for src in range(len(h) - 1):
        for dst in range(src + 1, min(len(h), src + k + 1)):
            cost = abs(h[src] - h[dst])
            key = create_key_for_cache(src, dst)
            cache[key] = cost
    return cache

            
def create_key_for_cache(src, dst):
    return '{0:d},{1:d}'.format(src, dst)


def write(result):
    print(result)


if __name__ == '__main__':
    solve()

Fixed submission:
def solve():
    h, k = read()
    result = think(h, k)
    write(result)


def read():
    n, k = read_int(2)
    return read_int(n), k


def read_int(n):
    return list(map(lambda x: int(x), read_line().split(' ')))[:n]


def read_line(n=0):
    if n == 0:
        return input().rstrip()
    else:
        return input().rstrip()[:n]


def think(h, k):
    cost = [0 for x in range(len(h))]
    for dst in range(1, len(h)):
        start_point = max(0, dst - k)
        cost[dst] = min([cost[src] + abs(h[src] - h[dst]) for src in range(start_point, dst)])
    return cost[len(h) - 1]


def write(result):
    print(result)


if __name__ == '__main__':
    solve()