Top 50 Data Structure and Algorithms Interview Questions for Programmers

2. Linked List Programming Interview Questions

A linked list is another common datum structure that complements the array datum structure. similar to the array, it is besides a analogue data structure and stores elements in a analogue fashion. however, unlike the array, it doesn ’ metric ton store them in contiguous locations ; alternatively, they are scattered everywhere in memory, which is connected to each other using nodes. A linked list is nothing but a list of nodes where each node contains the value stored and the address of the next node. Because of this structure, it’s easy to add and remove elements in a linked list, as you good need to change the connection rather of creating the array, but the search is difficult and much requires O ( normality ) time to find an element in the singly linked tilt. This article provides more information on the deviation between an range and linked list data structures. It besides comes in varieties like a individually linked number, which allows you to traverse in one direction ( forward or reverse ) ; a doubly-linked list, which allows you to traverse in both directions ( forward and back ) ; and last, the circular linked list, which forms a circle. In arrange to solve linked list-based questions, a good cognition of recursion is important, because a linked list is a recursive data structure. If you take one node from a linked list, the remaining datum structure is hush a linked list, and because of that, many linked list problems have simpler recursive solutions than iterative ones. here are some of the most common and popular linked tilt interview questions and their solutions :

  1. How do you find the middle element of a singly linked list in one pass? (solution)
  2. How do you check if a given linked list contains a cycle? How do you find the starting node of the cycle? (solution)
  3. How do you reverse a linked list? (solution)
  4. How do you reverse a singly linked list without recursion? (solution)
  5. How are duplicate nodes removed in an unsorted linked list? (solution)
  6. How do you find the length of a singly linked list? (solution)
  7. How do you find the third node from the end in a singly linked list? (solution)
  8. How do you find the sum of two linked lists using Stack? (solution)

These questions will help you to develop your problem-solving skills equally well as improve your cognition of the linked number data structure. If you are having trouble solving these linked tilt coding questions then I suggest you refresh your data structure and algorithm skills by going through Data Structures and Algorithms: Deep Dive Using Java course . You can besides check out this list of 30 linked list interview questions for more practice questions.

3. String Coding Interview Questions

Along with range and linked list data structures, a string is another democratic subject in programming occupation interviews. I have never participated in a code interview where no string-based questions were asked. A good thing about the string is that if you know the array, you can solve string-based questions easily because strings are nothing but a character array. so all the techniques you learn by solving array-based code questions can be used to solve string programming questions equally well. here is my number of frequently asked string coding questions from programming job interviews :

  1. How do you print duplicate characters from a string? (solution)
  2. How do you check if two strings are anagrams of each other? (solution)
  3. How do you print the first non-repeated character from a string? (solution)
  4. How can a given string be reversed using recursion? (solution)
  5. How do you check if a string contains only digits? (solution)
  6. How are duplicate characters found in a string? (solution)
  7. How do you count the number of vowels and consonants in a given string? (solution)
  8. How do you count the occurrence of a given character in a string? (solution)
  9. How do you find all the permutations of a string? (solution)
  10. How do you reverse words in a given sentence without using any library method? (solution)
  11. How do you check if two strings are a rotation of each other? (solution)
  12. How do you check if a given string is a palindrome? (solution)

These questions help improve your cognition of chain as a datum structure. If you can solve all these String questions without any help then you are in thoroughly shape. For more promote questions, I suggest you solve problems given in the Algorithm Design Manual by Steven Skiena, a reserve with the toughest algorithm questions . If you need more exercise, here is another list of 20 string coding questions.

5. Miscellaneous Coding Interview Questions

apart from data structure-based questions, most of the programming caper interviews besides ask algorithm, design, bit manipulation, and general logic-based questions, which I ’ ll describe in this section. It ’ randomness authoritative that you practice these concepts because sometimes they become slippery to solve in the actual interview. Having practiced them before not lone makes you familiar with them but besides gives you more confidence in explaining the solution to the interviewer .

  1. How is a bubble sort algorithm implemented? (solution)
  2. How is an iterative quicksort algorithm implemented? (solution)
  3. How do you implement an insertion sort algorithm? (solution)
  4. How is a merge sort algorithm implemented? (solution)
  5. How do you implement a bucket sort algorithm? (solution)
  6. How do you implement a counting sort algorithm? (solution)
  7. How is a radix sort algorithm implemented? (solution)
  8. How do you swap two numbers without using the third variable? (solution)
  9. How do you check if two rectangles overlap with each other? (solution)
  10. How do you design a vending machine? (solution)

If you need more such gull questions you can take help oneself from books like Cracking The Code Interview , by Gayle Laakmann McDowell which presents 189+ Programming questions and solutions. A good reserve to prepare for programming job interviews in a light fourth dimension . By the way, the more questions you solve in practice, the better your readiness will be. so, if you think 50 is not enough and you need more, then check out these extra 50 programming questions for telephone interviews and these books and courses for more thorough training.

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