Arrays:

• Two Sum
• Best Time to Buy and Sell Stock
• Contains Duplicate
• Product of Array Except Self
• Maximum Subarray
• Maximum Product Subarray
• Find Minimum in Rotated Sorted Array
• Search in Rotated Sorted Array
• 3Sum
• Container With Most Water

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Strings:

• Longest Substring Without Repeating Characters
• Longest Repeating Character Replacement
• Minimum Window Substring
• Encode and Decode Strings
• Valid Anagram
• Valid Parentheses
• Valid Palindrome
• Longest Palindromic Substring
• Palindromic Substrings

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Binary Trees:

• Maximum Depth of Binary Tree
• Same Tree
• Invert or Flip Binary Tree
• Binary Tree Maximum Path Sum
• Binary Tree Level Order Traversal
• Serialize and Deserialize Binary Tree
• Subtree of Another Tree ...

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...

• Construct Binary Tree from Preorder and Inorder Traversal
• Validate Binary Search Tree
• Kth Smallest Element in a BST
• Lowest Common Ancestor of BST

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Binary:

• Sum of Two Integers
• Number of 1 Bits
• Counting Bits
• Missing Number
• Reverse Bits

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Dynamic Programming:

• 0/1 Knapsack
• Climbing Stairs
• Coin Change
• Longest Increasing Subsequence
• Longest Common Subsequence
• Word Break Problem
• Combination Sum
• House Robber and House Robber II
• Decode Ways
• Unique Paths
• Jump Game

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Graphs:

• Clone Graph
• Course Schedule
• Alien Dictionary
• Pacific Atlantic Water Flow
• Number of Islands
• Graph Valid Tree
• Number of Connected Components in an - - - - Undirected Graph
• Longest Consecutive Sequence

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Linked Lists:

• Reverse a Linked List
• Detect Cycle in a Linked List
• Merge Two Sorted Lists
• Merge K Sorted Lists
• Remove Nth Node From End Of List
• Reorder List

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Matrix:

• Set Matrix Zeroes
• Spiral Matrix
• Rotate Image
• Word Search

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Heap:

• Merge K Sorted Lists
• Top K Frequent Elements
• Find Median from Data Stream

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Intervals:

• Insert Interval
• Merge Intervals
• Meeting Rooms and Meeting Rooms II
• Non-overlapping Intervals