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Problem List:

Arrays & Hashings:

• 242: isAnagram
• 1: twoSum
• 49: Group Anagrams
• 347: Top K Frequent Elements
• 271: Encode and Decode Strings
• 238: Product of Array Except Self
• 36: Valid Sudoku
• 128: Longest Consecutive Sequence

Two Pointers:

• 125: Valid Palindrome
• 167: Two Sum II - Input Array Is Sorted

Stack:

• 20: Valid Parantheses
• 155: Min Stack

Binary Search:

• 704: Binary Search
• 74: Search a 2D Matrix

Sliding Window:

• 121: Best Time to Buy and Sell Stock
• 3: Longest Substring Without Repeating Characters

Linked List:

• 206: Reverse Linked List
• 21 : Merge Two Sorted Lists
• 141: Linked List Cycle
• 143: Reorder List

Trees:

• 226: Invert Binary Tree
• 104: Maximum Depth of Binary Tree