grind

Problem Name	Data Structure
Two Sum	Array
Valid Parentheses	Stack
Merge Two Sorted Lists	Linked List
Best Time to Buy and Sell Stock	Array
Valid Palindrome	String
Invert Binary Tree	Binary Tree
Valid Anagram	String
Binary Search	Binary Search
Flood Fill	Graph
Lowest Common Ancestor of a Binary Search Tree	Binary Search Tree
Balanced Binary Tree	Binary Tree
Linked List Cycle	Linked List
Implement Queue using Stacks	Stack
First Bad Version	Binary Search
Ransom Note	Hash Table
Climbing Stairs	Dynamic Programming
Longest Palindrome	String
Reverse Linked List	Linked List
Majority Element	Array
Add Binary	Binary
Diameter of Binary Tree	Binary Tree
Middle of the Linked List	Linked List
Maximum Depth of Binary Tree	Binary Tree
Contains Duplicate	Array
Maximum Subarray	Dynamic Programming
Insert Interval	Array
01 Matrix	Graph
K Closest Points to Origin	Heap
Longest Substring Without Repeating Characters	String
3Sum	Array
Binary Tree Level Order Traversal	Binary Tree
Clone Graph	Graph
Evaluate Reverse Polish Notation	Stack
Course Schedule	Graph
Implement Trie (Prefix Tree)	Trie
Coin Change	Dynamic Programming
Product of Array Except Self	Array
Min Stack	Stack
Validate Binary Search Tree	Binary Search Tree
Number of Islands	Graph
Rotting Oranges	Graph
Search in Rotated Sorted Array	Binary Search
Combination Sum	Array
Permutations	Recursion
Merge Intervals	Array
Lowest Common Ancestor of a Binary Tree	Binary Tree
Time Based Key-Value Store	Binary Search
Accounts Merge	Graph
Sort Colors	Array
Word Break	Trie
Partition Equal Subset Sum	Dynamic Programming
String to Integer (atoi)	String
Spiral Matrix	Matrix
Subsets	Recursion
Binary Tree Right Side View	Binary Tree
Longest Palindromic Substring	String
Unique Paths	Dynamic Programming
Construct Binary Tree from Preorder and Inorder Traversal	Binary Tree
Container With Most Water	Array
Letter Combinations of a Phone Number	Recursion
Word Search	Graph
Find All Anagrams in a String	String
Minimum Height Trees	Graph
Task Scheduler	Heap
LRU Cache	Linked List
Kth Smallest Element in a BST	Binary Search Tree
Minimum Window Substring	String
Serialize and Deserialize Binary Tree	Binary Tree
Trapping Rain Water	Stack
Find Median from Data Stream	Heap
Word Ladder	Graph
Basic Calculator	Stack
Maximum Profit in Job Scheduling	Binary Search
Merge k Sorted Lists	Heap
Largest Rectangle in Histogram	Stack