- Stack (arrays and linked lists in C / generics C#)
 - Queue (arrays and linked lists in C / generics C#)
 - Binary Search Tree (basic generic implementation in C#)
 - Union–find (disjoint-sets) (C#)

 - Array rotation to left and right (C#)
 - 'Anagram' - Minimum number of character deletions required to make the two strings anagrams. (C#)
 - Hash Tables: Ransom Note (Dictionary<K, T> in C#)
 - Balanced Brackets (C# using the custom Stack<T> from above)
 - Queue (implementation with two stacks in C#)
 - Binary Search Tree - check if a binary tree is also a binary serach tree (C# using Binary Search Tree from above)
 - Prime numbers - basic algorithm for finding prime numbers (C#)

 - Bubble sort (C# / recursive and iterative)
 - Selection sort (C#)
 - Merge Sort (C and C# (using List<T>))
 - Quicksort (C# with List<int>)