2021 fall cs61a dis10

网址 https://inst.eecs.berkeley.edu/~cs61a/fa21/disc/disc10/#wwsd-3

problem1:

(define (vir-fib n)
(cond
((= n 0) 0)
((= n 1) 1)
(else (+ (vir-fib (- n 1)) (vir-fib (- n 2))))
)
)
problem2:

problem3 and 4:

problem5 and 6: