although the use of recursive algorithm is programmatically readable, it has many problems:

1. as the computing scale increases, it may cause the call stack to overflow
2. each function call has time and space overhead. The performance is not very good
3. is not easy to test, the code is correct when the scale is small, and it is not guaranteed to be correct when the scale is large.

question: should we try to avoid using recursion when writing code and use equivalent loops instead?

Thank you!