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How to prepare for coding interview in 2024 👇👇

1. Master Data Structures and Algorithms: Make sure you have a solid understanding of common data structures (such as arrays, linked lists, trees, graphs, etc.) and algorithms (sorting, searching, dynamic programming, etc.). Practice implementing them in your preferred programming language.

2. Practice Coding Problems: Solve coding problems on platforms like LeetCode, HackerRank, or CodeSignal. Focus on a variety of problem types to improve your problem-solving skills.

3. Review System Design Concepts: Understand the basics of system design principles and practice designing scalable systems. Resources like Grokking the System Design Interview can be helpful.

4. Learn the Latest Technologies: Stay updated with the latest technologies and trends in the industry. Familiarize yourself with popular frameworks, libraries, and tools that are commonly used in software development.

5. Mock Interviews: Practice mock interviews with friends, mentors, or through online platforms to simulate the interview experience. This will help you get comfortable with coding under pressure and receiving feedback.

6. Stay Consistent: Set aside dedicated time each day to practice coding problems and review concepts. Consistency is key to improving your skills over time.

7. Stay Calm and Confident: Remember that interviews are not just about technical skills but also about how you communicate and approach problem-solving. Stay calm, confident, and be prepared to explain your thought process during the interview.

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Common Data Structures and Algorithms (DSA) Interview questions 👇👇

1. Array Manipulation:
- Implement a function to find the maximum subarray sum within a given array.
- Write code to rotate an array to the right by k steps.

2. String Manipulation:
- Given two strings, determine if one is a permutation of the other.
- Implement a function to reverse a string in-place.

3. Linked Lists:
- Write code to reverse a linked list.
- Implement a function to detect if a linked list has a cycle.

4. Sorting and Searching:
- Implement the quicksort algorithm in Python.
- Write code to perform binary search on a sorted array.

5. Trees and Graphs:
- Implement a depth-first search (DFS) algorithm for a binary tree.
- Write code to find the shortest path between two nodes in a graph using breadth-first search (BFS).

6. Dynamic Programming:
- Solve the classic "Fibonacci sequence" problem using dynamic programming.
- Implement the "coin change" problem to find the minimum number of coins required to make a given amount of change.

7. Miscellaneous:
- Implement a stack using arrays or linked lists.
- Write code to check if a given number is prime.

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Top 5 Coding Challenge Platforms for Programmers 👩‍💻🚀

1. LeetCode
   - URL: https://leetcode.com
   - Description: Enhance problem-solving skills with a vast collection of coding challenges on LeetCode.

2. HackerRank
   - URL: https://www.hackerrank.com
   - Description: HackerRank offers diverse coding challenges for algorithm, data structure, and language proficiency improvement.

3. CodeSignal
   - URL: https://codesignal.com
   - Description: CodeSignal provides coding challenges and assessments to enhance coding skills for interviews and practice.

4. Codewars
   - URL: https://www.codewars.com
   - Description: Codewars engages developers in creative problem-solving through kata challenges, fostering skill development.

5. Exercism
   - URL: https://exercism.io
   - Description: Exercism offers coding exercises in various languages, providing mentorship and community support.

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Common Programming Interview Questions

How do you reverse a string?
How do you determine if a string is a palindrome?
How do you calculate the number of numerical digits in a string?
How do you find the count for the occurrence of a particular character in a string?
How do you find the non-matching characters in a string?
How do you find out if the two given strings are anagrams?
How do you calculate the number of vowels and consonants in a string?
How do you total all of the matching integer elements in an array?
How do you reverse an array?
How do you find the maximum element in an array?
How do you sort an array of integers in ascending order?
How do you print a Fibonacci sequence using recursion?
How do you calculate the sum of two integers?
How do you find the average of numbers in a list?
How do you check if an integer is even or odd?
How do you find the middle element of a linked list?
How do you remove a loop in a linked list?
How do you merge two sorted linked lists?
How do you implement binary search to find an element in a sorted array?
How do you print a binary tree in vertical order?

Conceptual Coding Interview Questions

What is a data structure?
What is an array?
What is a linked list?
What is the difference between an array and a linked list?
What is LIFO?
What is FIFO?
What is a stack?
What are binary trees?
What are binary search trees?
What is object-oriented programming?
What is the purpose of a loop in programming?
What is a conditional statement?
What is debugging?
What is recursion?
What are the differences between linear and non-linear data structures?


General Coding Interview Questions

What programming languages do you have experience working with?
Describe a time you faced a challenge in a project you were working on and how you overcame it.
Walk me through a project you’re currently or have recently worked on.
Give an example of a project you worked on where you had to learn a new programming language or technology. How did you go about learning it?
How do you ensure your code is readable by other developers?
What are your interests outside of programming?
How do you keep your skills sharp and up to date?
How do you collaborate on projects with non-technical team members?
Tell me about a time when you had to explain a complex technical concept to a non-technical team member.
How do you get started on a new coding project?

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Thanks for the amazing response. Here are the answers to each question 👇👇

1. How do you reverse a string?
Example:

   def reverse_string(s):
       return s[::-1]
   
   print(reverse_string("hello"))  # Output: "olleh"
   

2. How do you determine if a string is a palindrome?
Example:

   def is_palindrome(s):
       return s == s[::-1]
   
   print(is_palindrome("radar"))  # Output: True
   

3. How do you calculate the number of numerical digits in a string?
Example:

   def count_digits(s):
       return sum(1 for char in s if char.isdigit())
   
   print(count_digits("abc123def456"))  # Output: 6

Free Resources To Crack Coding Interviews
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Coding Interview Prep FREE CERTIFIED COURSE

https://www.freecodecamp.org/learn/coding-interview-prep/#take-home-projects

Python Interview Questions and Answers

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Beginner's guide for DSA

https://www.geeksforgeeks.org/the-ultimate-beginners-guide-for-dsa/amp/

Cracking the coding interview FREE BOOK

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DSA Interview Questions and Answers

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Cracking the Coding interview: Learn 5 Essential Patterns
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Data Science Interview Questions and Answers

https://t.me/datasciencefun/958

Java Interview Questions with Answers

https://t.me/Curiousprogrammer/106

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Here is a list of Important interview questions

SQL INTERVIEW QUESTIONS WITH IMPORTANT TOPICS
👇👇
https://t.me/sqlspecialist/426

Data Analyst Interview Questions
👇👇
https://t.me/DataAnalystInterview/69

Python Interview Questions and Answers
👇👇
https://t.me/dsabooks/96

Data Science Interview Questions
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https://t.me/datasciencefun/1058?single

Advanced Power BI Interview Questions
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https://t.me/sqlspecialist/422

DSA INTERVIEW QUESTIONS
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https://t.me/crackingthecodinginterview/77

Use Chat GPT to prepare for your next INTERVIEW
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Common coding interview questions 🧑‍💻

1. Reverse a String: Write a function to reverse a string.
2. Find the Missing Number: Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array.
3. Palindrome: Check if a given string is a palindrome or not.
4. Fibonacci Series: Write a function to generate the Fibonacci sequence up to a certain number of terms.
5. Binary Search: Implement the binary search algorithm to find an element in a sorted array.
6. Sorting Algorithms: Implement sorting algorithms such as bubble sort, selection sort, merge sort, or quicksort.
7. Linked Lists: Implement basic operations on linked lists such as insertion, deletion, and reversing.
8. Tree Traversal: Implement depth-first search (DFS) and breadth-first search (BFS) for binary trees.
9. Stacks and Queues: Implement basic operations on stacks and queues.
10. Dynamic Programming: Solve problems using dynamic programming techniques such as the knapsack problem, longest common subsequence, or Fibonacci series.
11. Graph Algorithms: Implement graph traversal algorithms like depth-first search (DFS) and breadth-first search (BFS), and algorithms like Dijkstra’s shortest path algorithm or Kruskal’s minimum spanning tree algorithm.
12. Two Sum Problem: Given an array of integers, return indices of the two numbers such that they add up to a specific target.

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Set of 12 Leetcode Questions on Linked List 👇👇

Easy :
21: Merge Two Sorted Lists
203: Remove Linked List Elements
206: Reverse Linked List
876: Middle of the Linked List

Medium :
19: Remove Nth Node From End of List
24: Swap Nodes in Pairs
116: Populating Next Right Pointers in Each Node
117. Populating Next Right Pointers in Each Node Il
237: Delete Node in a Linked List
707: Design Linked List

Hard :
23: Merge k Sorted Lists
25: Reverse Nodes in k-Group

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Top 40 commonly asked DSA questions :

𝗔𝗿𝗿𝗮𝘆𝘀 𝗮𝗻𝗱 𝗦𝘁𝗿𝗶𝗻𝗴𝘀:
1. Find the missing number in an array of integers.
2. Implement an algorithm to rotate an array.
3. Check if a string is a palindrome.
4. Find the first non-repeating character in a string.
5. Implement an algorithm to reverse a linked list.
6. Merge two sorted arrays.
7. Implement a stack using arrays/linked list.
8. Write a program to remove duplicates from a sorted array.

𝗟𝗶𝗻𝗸𝗲𝗱 𝗟𝗶𝘀𝘁𝘀:
1. Detect a cycle in a linked list.
2. Find the intersection point of two linked lists.
3. Reverse a linked list in groups of k.
4. Implement a function to add two numbers represented by linked lists.
5. Clone a linked list with next and random pointer.

𝗧𝗿𝗲𝗲𝘀 𝗮𝗻𝗱 𝗕𝗶𝗻𝗮𝗿𝘆 𝗦𝗲𝗮𝗿𝗰𝗵 𝗧𝗿𝗲𝗲𝘀 (𝗕𝗦𝗧):
1. Find the height of a binary tree.
2. Check if a binary tree is balanced.
3. Find the lowest common ancestor in a binary tree.
4. Serialize and deserialize a binary tree.
5. Implement an algorithm for in-order traversal without recursion.
6. Convert a BST to a sorted doubly linked list.

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Leetcode Questions you can check to Learn DSA from scratch 👇👇

1️⃣ Arrays: Data structures, such as arrays, store elements in contiguous memory locations. They are versatile and useful for a wide variety of purposes.
LeetCode Problems:
• Search in Rotated Sorted Array (Problem #33)
• Product of Array Except Self (Problem #238)
• Find the Missing Number (Problem #268)

2️⃣Two Pointers: In Two Pointers, two pointers are maintained in the collection and can be manipulated to solve a problem efficiently.
LeetCode problems:
• Trapping Rain Water (Problem #42)
• Longest Substring Without Repeating Characters (Problem #3)
• Squares of a Sorted Array (Problem #977)

3️⃣In-place Linked List Traversal: As an explanation, in-place traversal is a technique for modifying linked list nodes without using extra space.
LeetCode Problems:
• Remove Nth Node From End of List (Problem #19)
• Reorder List (Problem #143)

4️⃣Fast & Slow Pointers: This pattern uses two pointers to traverse a sequence at different speeds (fast and slow), often used to detect cycles or find a specific position in the sequence.
LeetCode Problems:
• Happy Number (Problem #202)
• Subarray Sum Equals K (Problem #560)
• Intersection of Two Linked Lists (Problem #160)

5️⃣Merge Intervals: This pattern involves merging overlapping intervals in a collection, often used in problems dealing with intervals or ranges.
LeetCode problems:
• Non-overlapping Intervals (Problem #435)
• Minimum Number of Arrows to Burst Balloons (Problem #452)

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How to become a better software developer:

1. Admit you don't know it all
2. Practice, practice, practice
3. Take every opportunity to learn
4. Accept your peers as a valuable source of knowledge
5. Embrace failure as a way to grow

Typical java interview questions sorted by experience


Junior
* Name some of the characteristics of OO programming languages
* What are the access modifiers you know? What does each one do?
* What is the difference between overriding and overloading a method in Java?
* What’s the difference between an Interface and an abstract class?
* Can an Interface extend another Interface?
* What does the static word mean in Java?
* Can a static method be overridden in Java?
* What is Polymorphism? What about Inheritance?
* Can a constructor be inherited?
* Do objects get passed by reference or value in Java? Elaborate on that.
* What’s the difference between using == and .equals on a string?
* What is the hashCode() and equals() used for?
* What does the interface Serializable do? What about Parcelable in Android?
* Why are Array and ArrayList different? When would you use each?
* What’s the difference between an Integer and int?
* What is a ThreadPool? Is it better than using several “simple” threads?
* What the difference between local, instance and class variables?

Mid
* What is reflection?
* What is dependency injection? Can you name a few libraries? (Have you used any?)
* What are strong, soft and weak references in Java?
* What does the keyword synchronized mean?
* Can you have “memory leaks” on Java?
* Do you need to set references to null on Java/Android?
* What does it means to say that a String is immutable?
* What are transient and volatile modifiers?
* What is the finalize() method?
* How does the try{} finally{} works?
* What is the difference between instantiation and initialisation of an object?
* When is a static block run?
* Why are Generics are used in Java?
* Can you mention the design patterns you know? Which of those do you normally use?
* Can you mention some types of testing you know?

Senior
* How does Integer.parseInt() works?
* Do you know what is the “double check locking” problem?
* Do you know the difference between StringBuffer and StringBuilder?
* How is a StringBuilder implemented to avoid the immutable string allocation problem?
* What does Class.forName method do?
* What is Autoboxing and Unboxing?
* What’s the difference between an Enumeration and an Iterator?
* What is the difference between fail-fast and fail safe in Java?
* What is PermGen in Java?
* What is a Java priority queue?
* *s performance influenced by using the same number in different types: Int, Double and Float?
* What is the Java Heap?
* What is daemon thread?
* Can a dead thread be restarted?

Source: medium.

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