Challenge 401-1: Array Shift
Challenge 401-2: Array Binary Search
Challenge 401-3/4/5: Linked List
Challenge 401-6: Zip List
Challenge 401-11: Queues With Stacks
Challenge 401-12: FIFO Animal Shelter
Challenge 401-13: Multi-Bracket Validation
Challenge 401-15/16: Binary Trees
Challenge 401-26: Insertion Sort
Challenge 401-27: Merge Sort
Challenge 401-30: Hash Table
Challenge 401-31: Repeated Words