Data structure and algorithms for interviews

Covers around 20+ most popular coding interview problems ranging from a variety of topics   ( will have 200+ problems as 4 problems are being added every week)

• Merge Intervals

  • Idea of Merge Intervals

  • Merge Intervals

  • Intervals Intersection (coming soon)

  • Conflicting Appointments (coming soon)

• Two Pointers

  • Idea of Two pointers and types of two pointers solutions

  • Two Sum

  • Remove Duplicates from Sorted Array

  • 3 Sum

  • Pair with Target Sum  (coming soon)

  • Squaring a Sorted Array  (coming soon)

  • Triplet Sum to Zero   (coming soon)

  • Triplet Sum Close to Target   (coming soon)

  • Triplets with Smaller Sum   (coming soon)

  • Subarrays with Product Less than a Target  (coming soon)

  • Dutch National Flag Problem  (coming soon)

• Fast & Slow Pointers

  • Linked List Cycle using Floyd’s Cycle Detection Algorithm

  • Happy Numbers

  • Ugly number  (coming soon)

  • Middle of the LinkedList (coming soon)

  • LinkedList Cycle  (coming soon)

  • Start of LinkedList Cycle (coming soon)

• Bitwise Manipulation

  • Single Numbers 

  • Flipping an Image

  • Single Number II ( coming soon)

  • Single Number III ( coming soon)

• Greedy Technique

  • What are Greedy Algorithms ?

  • Bulbs

  • Highest Product

  • Disjoint Sets

  • Largest Permutation ( coming soon)

  • Meeting rooms ( coming soon)

  • Distribute Candy ( coming soon)

  • Seats ( coming soon)

  • Assign Mice to Holes ( coming soon)

  • Majority Element ( coming soon)

  • Gas Station ( coming soon)

• Island Patterns

  • Intro to Matrix

  • Number of Islands Explanation

  • Number of Islands Code

  • Number of distinct Islands Explanation

  • Number of distinct island coding

  • Count sub islands   

  • Max Area of an island   (coming soon)

  • Island Perimeter  (coming soon)

  • Flood fill  (coming soon)

  • Wall and Fates   (coming soon)

  • Minesweeper   (coming soon)

  • Surrounded Regions   (coming soon)

  • Find all groups of a farm land   (coming soon)

• Topological Sort

  • Introduction to Graph Problems 

  • Topological Sort

  • Kahn’s Algorithm

  • Implementing Topological Sort

  • Course Schedule

  • Alien Dictionary

  • Minimum Height Trees  (coming soon)

  • All Ancestors of a Node in a Directed Acyclic Graph  (coming soon)

  • Build a Matrix With Conditions  (coming soon)

  • Find All Possible Recipes from Given Supplies  (coming soon)

• Depth First Search

  • Path Sum

Upcoming Additions  (3-4 problems are added every week)

• Sliding Window

  • Easy

    • Maximum Sum Subarray of Size K

    • Smallest Subarray With a Greater Sum

  • Medium

    • Longest Substring with maximum K Distinct Characters 

    • Fruits into Baskets

  • Hard

    • Longest Substring with Distinct Characters

    • Longest Substring with Same Letters after Replacement

    • Longest Subarray with Ones after Replacement

• Arrays

  • Medium

    • Group Anagrams

  • Hard

    • Trapping Rain Water

• Merge Intervals

  • Medium

    • Intervals Intersection

    • Conflicting Appointments

• Linked List

  • Easy

    • Reverse a Linked List

  • Medium

    • Reverse a sub list

    • Reverse a k-element sub list

• Two Heaps

  • Medium

    • Find the median of a number stream

  • Hard

    • Maximum Capital

    • Sliding Window Median 

• Top k elements

  • Easy

    • Top ‘K’ Numbers

    • Kth Smallest Number

    • ‘K’ Closest Points to the Origin

    • Connect Ropes

  • Medium

    • Top ‘K’ Frequent Numbers

    • Frequency Sort

    • Kth Largest Number in a Stream

    • ‘K’ Closest Numbers

    • Maximum Distinct Elements

    • Sum of Elements

  • Hard

    • Rearrange String

• K-way merge

• Binary Search

• Backtracking

• 1D Dynamic programing

• 2D Dynamic programing

• Cyclic Sort

• Topological Sort

• Stacks

• Queues

• Depth First Search

• Breadth First Search

• Trie

• Hash Maps

• Math Tricks

• Miscellaneous