Why I write this post ?

In order to be a better programmer,
getting a dream software job,
all developers must face the devil call "Algorithms",
especially something called "Recursion" really showed me how DESPERATION looks like 😵‍💫😵‍💫😵‍💫.

After struggling for a while,
I search for "How to use Recursion comfortably",
and finally found a book called Think like a programmer.

This book really SAVED MY LIFE !!! 🥳🥳🥳,
and now I can use Recursion pretty comfortably,
even able to solve the medium Tree problem within 10 mins,
which is extremely amazing !!!

And I want to share you guys such amazing experience,
so you won't suffer from it.

Prerequisite of being a Pro

Before becoming a recursion pro, let's review basics of recursion.

Recursion means "calling itself",
and it has 2 vital concepts,
which are Recurrence relation and Base case,

• Recurrence relation :

the relationship between the problem and its direct 
subproblems

• Base case :

the simplest case, which the function can handle on its own 
without calling itself.

( if you're not familiar with these concepts, you can read the Martin and Dragon story )

...to be continued

References

• Think like a programmer
• LeetCode Recursion Card