Readme.md

Data Structures Efficiency

1. A text file students.txt holds information about students and their courses in the following format:

   First Name	Last Name	Course
   Kiril	Ivanov	C#
   Stefka	Nikolova	SQL
   Stela	Mineva	Java
   Milena	Petrova	C#
   Ivan	Grigorov	C#
   Ivan	Kolev	SQL

   Using SortedDictionary<K, T> print the courses in alphabetical order and for each of them prints the students ordered by family and then by name:

       C#: Ivan Grigorov, Kiril Ivanov, Milena Petrova
       Java: Stela Mineva
       SQL: Ivan Kolev, Stefka Nikolova
   

• A large trade company has millions of articles, each described by barcode, vendor, title and price. Implement a data structure to store them that allows fast retrieval of all articles in given price range [x...y]. Hint: use OrderedMultiDictionary<K, T> from Wintellect's Power Collections for .NET.
• Implement a class BiDictionary<K1, K2, T> that allows adding triples { key1, key2, value } and fast search by key1, key2 or by both key1 and key2.
  • Note: multiple values can be stored for given key.