[Question][Hw1] Can I change function definition to recursive definition?

[yusungsim]

While I was solving HW-1-1, questions 1 and 2, I found it very natural to define the functions sigma and zip as recursive function.

However in the skeleton codes, the functions are defined as non-recursive (ie. defined only using let).

Can I change this to recursive definition? (ie. using let rec)

[mekty2012]

The README says so.

Notice that students are not permitted to change directory structures and types of the functions, but allowed to change let to let rec if needed.

[yusungsim]

Oops, sorry I didn't checked that carefully. Thanks!