Data structure and algorithms for interviews

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WebHelperApp

December 1, 2022

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Requirements

python
basic idea of Data Structures and Algorithms
Leetcode account

Description

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)

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)

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