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34 lines (26 loc) · 782 Bytes
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"""
This problem was asked by Jane Street.
cons(a, b) constructs a pair, and car(pair) and cdr(pair) returns the first and last element of that pair. For example, car(cons(3, 4)) returns 3, and cdr(cons(3, 4)) returns 4.
Given this implementation of cons:
def cons(a, b):
def pair(f):
return f(a, b)
return pair
Implement car and cdr.
"""
def cons(a, b):
def pair(f):
return f(a, b)
return pair
def car(func):
def inner(*num):
return num[0]
return func(inner)
def cdr(func):
def inner(*num):
return num[-1]
return func(inner)
if __name__ == "__main__":
a, b = [int(i.strip()) for i in input("Enter the number for a and b: ").split(",")]
print("CAR: ", car(cons(a,b)))
print("CDR: ", cdr(cons(a,b)))