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  • lintcode
  • EPI
  • Graph
  • LinkedIn
    • House robber II
    • Single Number
    • Flatten Binary Tree to Linked List
    • Smallest Difference pair of values between two unsorted Arrays
    • Word Search II
    • Implement Trie (Prefix Tree)
    • K Closest Points
    • implement BST
    • HashMap
    • Implement strStr()
    • Min Stack
    • Meeting Rooms
    • Shortest Completing Word
    • Longest Palindromic Substring
    • Longest Palindromic Subsequence
    • Count Different Palindromic Subsequences
    • Palindromic Substrings
    • Sparse Matrix Multiplication
    • Insert Delete GetRandom O(1) - Duplicates allowed
    • Bulb Switcher
    • Verify Preorder Sequence in Binary Search Tree
    • Untitled
    • Find the Celebrity
    • Coin Change
    • Partition Equal Subset Sum
    • Permutation Sequence
    • Next Permutation
    • Kth Smallest Element in a BST
    • Word Search
    • Word Break
    • Shuffle an Array
    • Add Two Numbers
    • Longest Substring Without Repeating Characters
    • Longest Increasing Subsequence
    • 3Sum Smaller
    • LFU Cache
    • Copy List with Random Pointer
    • Linked List Cycle
    • Merge Sorted Array
    • Two Sum II - Input array is sorted
    • Search Insert Position
    • Find First and Last Position of Element in Sorted Array
    • Combination Sum
    • Path Sum
    • Roman to Integer
    • Valid Parentheses
    • Product of Array Except Self
    • Permutations
    • 3Sum
    • Reverse Integer
    • Longest Common Subsequence and substring
    • Implement Stack using Queues
    • Sort Characters By Frequency
    • Delete Node in a BST
    • Invert Binary Tree
    • Serialize and Deserialize BST
    • Reverse String
    • Binary Tree Zigzag Level Order Traversal
    • Friend Circles
    • Letter Combinations of a Phone Number
    • Fizz Buzz
    • Encode and Decode TinyURL
    • Binary Tree Right Side View
    • Shortest Word Distance III
    • Binary Search Tree Iterator
    • Kth Largest Element in an Array
    • Clone Graph
    • Lowest Common Ancestor III
    • Lowest Common Ancestor II
    • Reverse Words in a String
    • Path Sum
    • Find K Pairs with Smallest Sums
    • Validate Binary Search Tree
    • All O`one Data Structure
    • Top K Frequent Elements
    • Integer to Roman
    • Shortest Word Distance III
    • Edit Distance
    • Profitable Schemes
    • Minimum Window Substring
    • LRU Cache
    • Text Justification
    • Integer to English Words
    • Partition to K Equal Sum Subsets
    • Graph Valid Tree
    • Exclusive Time of Functions
    • Repeated DNA Sequences
    • Valid Number
    • Insert Delete GetRandom O(1)
    • Same Tree
    • Friends Within Three Jumps
    • Isomorphic Strings
    • Sum of Square Numbers
    • Valid Perfect Square
    • Evaluate Reverse Polish Notation
    • House Robber
    • Palindromic Substrings
    • Find Largest Value in Each Tree Row
    • Can Place Flowers
    • Insert Interval
    • Maximum Depth of Binary Tree
    • Two Sum
    • Paint House II
    • Max Points on a Line
    • Word Ladder II
    • Word Ladder
    • Validate IP Address
    • Maximum Product Subarray
    • Factor Combinations
    • Flatten Nested List Iterator
    • Max Stack
    • Number of Connected Components in an Undirected Graph
    • Combination Sum II
    • Permutations II
    • Permutations
    • Climbing Stairs
    • Paint House
    • Closest Binary Search Tree Value
    • Closest Binary Search Tree Value II
    • Rotate String
    • Max Area of Island
    • Maximum Subarray
    • Serialize and Deserialize Binary Tree
    • Second Minimum Node In a Binary Tree
    • Lowest Common Ancestor of a Binary Tree
    • Lowest Common Ancestor of a Binary Search Tree
    • Symmetric Tree
    • Binary Tree Upside Down
    • Maximum Depth of Binary Tree
    • Find Leaves of Binary Tree
    • Number of Islands
    • Nested List Weight Sum II
    • Nested List Weight Sum
    • Merge Intervals
    • Valid Triangle Number
    • Find K Closest Elements
    • Find Smallest Letter Greater Than Target
    • Pow(x,n)
    • Search in Rotated Sorted Array II
    • Search in Rotated Sorted Array
    • Sqrt(x)
    • Intersection of Two Linked Lists
    • Binary Tree Level Order Traversal
    • Shortest Word Distance
    • Two Sum III - Data structure design
    • Shortest Word Distance II
  • Binary Search
  • Binary Tree
  • BFS
  • DFS
  • Dynamic Programming
  • Linked List
  • Arrays
  • Strings
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