Big O is not the only factor to consider when you think about algorithm performance. Also: - Disk usage - Memory - Cache - Network - Concurrency (and its overhead) - ...

"If you don't fail at least 90 percent of the time, you're not aiming high enough." - Alan Kay

In MATLAB, for a nxn array A, what does A(:) do? It creates a n^2x1 column vector. Column, not row, because MATLAB matrices are column-major

2 Quick Interview tips - Think out loud while solving the problem. Explain your thought process. - If your interviewer jumps in to help you, don't freak out. It's normal.

If it's worth doing just once, it is worth automating!

The best code is the one you don't have to write.

If the code and the comments disagree, they are both probably wrong

In Linux, directories have permissions too - You can list their contents if it's *readable* - You can access a file in a directory if the directory is *executable* To change permissions, use chmod - chmod 711 file - chmod u+x file (users can execute the file)

Design patterns in 1 tweet Flyweight: support a large number objects efficiently by sharing constant parts of their state (called intrinsic state) Ex: To represent a text document, a Flyweight object is created per character in the character set.

R was created in 1993 at the University of Auckland in New Zealand by Robert Gentleman and Ross Ihaka R is mostly used for data data analysis. In of January 2020, R ranked the 18th most popular programming language

AWS Storage Services - S3: general - Glacier: archiving & backup - EBS: block storage (disks) - Storage Gateway: connect on-premise with storage in AWS infrastructure

Know what version of Python you're using. There are differences. For instance, when dealing with strings: Python 3: bytes contains sequences of 8-bit values, str -> seqs of Unicode chars Python 2: str contains sequences of 8-bit values, unicode -> seqs Unicode chars

HTTP status codes in 1 tweet 1xx: Still processing 2xx: Alles Gut 3xx: Check somewhere else 4xx: Client's fault 5xx: Server's fault

"A year spent in artificial intelligence is enough to make one believe in God." - Alan J. Perlis

Merge sort is a divide and conquer, stable, comparison-based algorithm invented by John von Neumann in 1945 The idea is to split a list into sublists, sort them (recursion) and then merge the sorted lists. Its time complexity is O(NlogN) and space complexity is O(N)

Design patterns in 1 tweet Decorator: Add responsabilities to objects dynamically Ex: in a war videogame, adding accesories to a basic weapon (can be added after creating it)

"Owning a computer without programming is like having a kitchen and using only the microwave oven." - Charles Petzold

Scala was developed by Martin o darsky in 2003 combining functional and object-oriented programming Many its design decisions are aimed to address criticisms of Java object Hello { def main(args: Array[String]) = { println("Hello, world") } }

3 Random coding tips Pay off technical debt Prioritize tasks Don't overlook the details

Big O quick tip Try to remember this pattern: A problem where the number of elements in the problem space gets halved "at each step", will most likely have O(logN) time complexity