我们现在学了递归,但我难以理解它,假如从表面上去看,确实挺容易于是解的.但要跟着它跑几次就越来越不清晰了.
哪位可以教我怎么学习递归

a function call itself is called recursive.
u'd better use iterative as much as u can.
because recursive bring a lot of problems.