CURSOR.EDUCATION
Materials
https://www.geeksforgeeks.org/map-interface-java-examples/
https://www.geeksforgeeks.org/internal-working-of-hashmap-java/
https://www.baeldung.com/java-hashmap
https://netjs.blogspot.com/2015/05/how-hashmap-internally-works-in-java.html
https://dzone.com/articles/hashmap-internal
https://www.gatevidyalay.com/collision-resolution-techniques-separate-chaining/
https://www.dineshonjava.com/internal-working-of-treemap-in-java/
https://en.wikipedia.org/wiki/Red%E2%80%93black_tree
https://www.cs.usfca.edu/~galles/visualization/RedBlack.html