四项一起对得上吗

运行下面这段程序：

def fib_tab(n):
    if n < 2:
        return n
    dp = [0] * (n + 1)
    dp[1] = 1
    for i in range(2, n + 1):
        dp[i] = dp[i - 1] + dp[i - 2]
    return dp[n]

def climb(n):
    dp = [0] * (n + 1)
    dp[0] = 1
    for i in range(1, n + 1):
        dp[i] = dp[i - 1]
        if i >= 2:
            dp[i] += dp[i - 2]
    return dp

def rob(a):
    dp = [0] * (len(a) + 1)
    if a:
        dp[1] = a[0]
    for i in range(2, len(a) + 1):
        dp[i] = max(dp[i - 1], dp[i - 2] + a[i - 1])
    return dp

def max_sub(a):
    best = a[0]
    cur = a[0]
    for x in a[1:]:
        cur = max(x, cur + x)
        best = max(best, cur)
    return best

ok = (fib_tab(12) == 144
      and climb(10)[10] == 89
      and rob([2, 7, 9, 3, 1])[-1] == 12
      and max_sub([-2, 1, -3, 4, -1, 2, 1, -5, 4]) == 6)
print(ok)