All Problems (8) #

Sorting #

1. Insertion Sort Singly Linked List

Hashtable #

1. Contains Duplicate

Linked List #

1. LRU Cache

Binary Tree #

1. Maximum Depth of Binary Tree

Binary Search Tree #

1. Validate Binary Search Tree
2. Recover Binary Search Tree

Backtracking #

1. Letter Combinations of a Phone Number
2. Generate Parentheses
3. Combination Sum