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Functions (CS): Level 1 Challenges

     

Can you identify the function f(x,y) which takes two positive integers as its argument?

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def f(x,y):
    minimum = min(x,y)
    maximum = max(x,y)
    if minimum == 0:
        return maximum
    elif minimum == 1:
        return 1
    else:
        return f(minimum,maximum-minimum)

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Eli Ross by Eli Ross

What would the following python code print out? 

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current_year = 2015   
andy_birth = 1984   
andy_minus_adaline = 4   
adaline = andy - andy_minus_adaline   
andy = current_year - andy_birth   
print adaline

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Calvin Lin by Calvin Lin

The Ackermann function is a computable function which grows very, very quickly as its inputs grow. For example, while \( A(1,2),\) \(A (2,2),\) and \(A(3,2) \) are equal to \(4,7,\) and \(29,\) respectively, \( A(4,2) \approx 2 \times 10^{19728} \).

The Ackermann function can be defined as follows: \[ A(m,n) = \begin{cases} n+1 & \mbox{if } m = 0 \\ A(m-1, 1) & \mbox{if } m > 0 \mbox{ and } n = 0 \\ A(m-1, A(m, n-1)) & \mbox{if } m > 0 \mbox{ and } n > 0. \end{cases} \]

What is the value of \( A(3,6)? \)

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Chung Gene Keun by Chung Gene Keun
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