DSA Interview Challenges

A curated list of data structures and algorithms problems
along with the solution in JavaScript to crack engineering interviews

Go through Usage Guide before you start solving
To download all the challenges as pdf, click here

Newbie

1. Running Sum of 1d Array
2. Fibonacci Number
3. Shuffle the Array
4. Search Insert Position
5. Pascal's Triangle
6. Reverse String
7. Matrix Diagonal Sum
8. Reverse Integer
9. Jewels and Stones
10. Kids With the Greatest Number of Candies
11. Maximum Product of Two Elements in an Array
12. Merge Sorted Array

Warm Up

1. Missing Number
2. Majority Element
3. Single Number
4. Rotate Array
5. Two Sum
6. Move Zeroes
7. Squares of a Sorted Array
8. Maximum Subarray
9. Search in Rotated Sorted Array
10. Product of Array Except Self
11. How Many Numbers Are Smaller Than the Current Number
12. Best Time to Buy and Sell Stock

Array 1D

1. Container With Most Water
2. House Robber
3. Sort Colors
4. Subsets
5. Combination Sum
6. 3 Sum
7. Find the Duplicate Number
8. Coin Change
9. Jump Game
10. Kth Largest Element in an Array
11. Longest Increasing Subsequence
12. Maximum Product Subarray

Array 2D

1. Search a 2D Matrix
2. Spiral Matrix
3. Flipping an Image
4. Unique Paths
5. Word Search
6. Set Matrix Zeroes
7. Number of Islands
8. Minimum Path Sum
9. Path With Minimum Effort
10. Course Schedule
11. Merge Intervals
12. Non-overlapping Intervals

Strings

1. Ransom Note
2. Valid Parentheses
3. Check if the Sentence Is Pangram
4. Valid Anagram
5. Longest Common Prefix
6. Reverse Only Letters
7. First Unique Character in a String
8. Palindromic Substrings
9. Longest Substring Without Repeating Characters
10. Longest Palindromic Substring
11. Group Anagrams
12. Generate Parentheses

Linked List

1. Middle of the Linked List
2. Merge Two Sorted Lists
3. Remove Duplicates from Sorted List
4. Linked List Cycle
5. Intersection of Two Linked Lists
6. Reverse Linked List
7. Add Two Numbers
8. Palindrome Linked List
9. Swapping Nodes in a Linked List
10. Odd Even Linked List
11. Reorder List
12. Remove Nth Node From End of List

Binary Trees

1. Path Sum
2. Invert Binary Tree
3. Cousins in Binary Tree
4. Diameter of Binary Tree
5. Binary Tree Paths
6. Average of Levels in Binary Tree
7. Maximum Depth of Binary Tree
8. Merge Two Binary Trees
9. Same Tree
10. Sum of Left Leaves
11. Leaf-Similar Trees
12. Symmetric Tree

Binary Search Trees

1. Range Sum of BST
2. Search in a Binary Search Tree
3. Minimum Absolute Difference in BST
4. Minimum Distance Between BST Nodes
5. Lowest Common Ancestor of a Binary Search Tree
6. Validate Binary Search Tree

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Contributing Guide

If you want to contribute, improve or suggest changes to this repo, then check out the Contributing Guide

License

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