Challenge 1
Calculate the Mean and Mode
Challenge 2
Maximize stock trading profit
Challenge 3
Prime Number Finder
Challenge 4
Balanced Binary Search Tree
Challenge 5
Semi-Prime Numbers
Challenge 6
Flatten an array
Challenge 7
Sum of Prime Factors
Challenge 8
Unique characters in a string
Challenge 9
FizzBuzz
Challenge 10
Find the missing numbers
Challenge 11
Find the Xth number
Challenge 12
Reverse words
Challenge 13
Product of everything else
Challenge 14
Max product finder
Challenge 15
Stairmaster
Challenge 16
Fibonacci finder
Challenge 17
Change please
Challenge 18
Swap elements in a linked list