DSandAlgorithmNanoDegree

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DSandAlgorithmNanoDegree

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Documentation of most of the code I wrote and resources I used while taking the Udacity DS Nanodegree. #GoingBackToTheBasics.

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# DSandAlgorithmNanoDegree
### Background
I am currently trying to complete Udacity's Data Structures and Algorithms Nanodegree in 30 days.
 If I do not have a certificate / the final routeplanner project uploaded here by Apr 26, 2020.
Then I have failed and I deserve the burn of paying $399 out of pocket 😬.

### Update
 
I went through all the lessons and passed all the projects just in time, 30 days.

### How?

I leveraged Youtube and Medium a lot, some of Udacity's content was not so good in some cases so I made sure that I 
didn't get stuck wondering about anything on Udacity. The moment something seemed too confusing, I hit Youtube
immediately.

Here are some interesting areas and the resources that helped me through them.
- Python: The course had a brief introduction to python in the initial section, but if for whatever reason that's not
sufficient, checkout <https://www.youtube.com/watch?v=YYXdXT2l-Gg&list=PL-osiE80TeTt2d9bfVyTiXJA-UTHn6WwU>. You should 
have enough to go on when you get to lecture 50.
- Recursion: Udacity did a great job here. But the videos at <https://www.youtube.com/watch?v=_I0zspi93ow> and <https://www.youtube.com/watch?v=TnZHaH9i6-0&t=423s>
helped solidify my understanding.
- There is an interesting exercise in the second project on Huffman coding. A basic data compression algorithm that leverages binary trees and 
DFS traversal. <https://www.youtube.com/watch?v=JsTptu56GM8&t=269s> is a great resource that completely demystified it for me. Theres really 
no code in the video and at the end, I was able to code the algorithm on my own. Cool stuff.
- Basic Algorithms: Udacity did a great job on the Basic Algorithm's section, but if you want a different perspective and info on some
algorithms not covered in the course. Check out this video <https://www.youtube.com/watch?v=JUOyKSZScW0>
- Graph theory: I didn't really understand anything the Udacity tutor was saying on this topic until I watched these videos on Graphs and how
they can be represented. 
    * <https://www.youtube.com/watch?v=AfYqN3fGapc> 
    * <https://www.youtube.com/watch?v=ZdY1Fp9dKzs> 
    * <https://www.youtube.com/watch?v=9C2cpQZVRBA>
    * <https://www.youtube.com/watch?v=k1wraWzqtvQ>
For a good explanation on Djikstra's algorithm and A*, checkout the playlist at <https://www.youtube.com/watch?v=pVfj6mxhdMw&list=PLTd6ceoshprfgFGcdiQw9LQ3fXaYC-Zs2>

- Dynamic Programming: This is where things got real, For a really good intro to dynamic programming. Check out <https://www.youtube.com/watch?v=iv_yHjmkv4I>. Really demystifies 
the thing. I got stuck on the 0-1 Knapsack problem for like 2 days. I dunno why? I was obsessed with it for some reason. The article at <https://medium.com/@fabianterh/how-to-solve-the-knapsack-problem-with-dynamic-programming-eb88c706d3cf>
helped remedy that. Then some futher study using <https://www.youtube.com/watch?v=eQA-m22wjTQ&list=PLDV1Zeh2NRsDGO4--qE8yH72HFL1Km93P> also helped a lot. I haven't got through the entire playlist
yet but so far, its been gem!
- A*: Pray to God and take a second look at this playlist: <<https://www.youtube.com/watch?v=pVfj6mxhdMw&list=PLTd6ceoshprfgFGcdiQw9LQ3fXaYC-Zs2>

### What next?

I am thinking of spending some of the money I saved on Udacity at <https://algoexpert.io>, then I should probably finish some extra content 
I discovered on youtube and hit the streets of Leetcode to deepen and test my understanding of what I learnt. But that's another story.

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