These questions are in no particular order. Every question will give you enough exposure to strategies and techniques required to solve most of the problem solving & data structures related questions in the interviews.

Some of the techniques used in these problems are two pointers, invariant windows, binary search, DFS/BFS, recursion, interval scheduling related, simple DP and bit manipulation, heaps, data structure design etc.

Some of the techniques used in these problems are two pointers, invariant windows, binary search, DFS/BFS, recursion, interval scheduling related, simple DP and bit manipulation, heaps, data structure design etc.

- Two Sum
- 3Sum
- Combination Sum
- Minimum Window Substring
- Maximum Subarray
- Longest substring without repeating characters
- Longest Palindromic Substring
- Longest repeating character replacement
- Search in a rotated sorted array
- Maximum Subarray
- Spiral Matrix
- Rotate Image
- Container with most Water
- Best Time to Buy and Sell Stock
- Remove Nth Node from end of a list
- Maximum Product Subarray
- Reverse LinkedList
- Product of Array Except Self
- Find minimum in rotated sorted array
- Valid Parenthesis
- Merge two sorted lists
- Merge K sorted lists
- Group Anagrams
- Merge Intervals
- Meeting Rooms
- Meeting Rooms ||
- Minimum Number of arrows to burst balloons
- Insert Interval
- Unique Paths
- Jump Game
- Climbing Stairs
- Set Matrix Zeros
- Word Search
- Word Search ||
- Validate Binary Search Tree
- Binary Tree Level Order Traversal
- Maximum Depth of a Binary Tree
- Binary Tree from Preorder and Inorder traversals
- Binary Tree Maximum Path Sum
- Invert Binary Tree
- Kth Smallest Element in a BST
- Lowest Common Ancestor in a BST
- Serialize and deserialize binary tree
- Subtree of Another Tree
- Number of connected components in an undirected graph
- Clone Graph
- Valid Palindrome
- Longest Consecutive Sequence
- Word Break
- Decode Ways
- Linked List Cycle
- Reorder List
- Reverse Bits
- Number of 1 Bits
- House Robber
- House Robber ||
- Number of Islands
- Implement Trie
- Add and Search Word - DS Design
- Contains Duplicate
- Course Schedule
- Valid Anagram
- Group Valid Tree
- Missing Number
- Alien Dictionary
- Encode And Deode Strings
- Find Median from data stream
- Longest Increasing Subsequence
- Coin Change
- Counting Bits
- Top K frequent elements
- Sum of Two Integers
- Pacific Atlantic Water flow
- Non Overlapping Intervals

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