Data Structures Interview Questions

20 real Data Structures questions asked in live technical interviews — each with a model answer. Updated weekly.

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Can you add values from both these lists?🟡 Medium · Coding · Asked 4×How can you remove duplicate values from a list?🟢 Easy · Coding · Asked 1×What are the collection types we have in Python?🟢 Easy · Conceptual · Asked 1×Can you explain the difference between Python, List, and Tuple?🟢 Easy · Conceptual · Asked 1×Write Python logic to count word frequency in a string.🟡 Medium · Coding · Asked 1×Write Python code to count word frequency in a string.🟢 Easy · Coding · Asked 1×What are the differences between a list, a set, and a dictionary?🟡 Medium · Conceptual · Asked 1×What is the difference between a shallow copy and a deep copy in Python?🟡 Medium · Conceptual · Asked 1×What is the difference between a list and a tuple in Python? What is the difference between == and is in Python? What are Python decorators?🟡 Medium · Conceptual · Asked 1×What is the difference between a list and a tuple in Python?🟢 Easy · Conceptual · Asked 1×Write code to sort list L1 and reorder list L2 so that each element in L2 stays paired with its corresponding element in L1 after sorting.🟡 Medium · Coding · Asked 1×Given two lists, sort the first list and reorder the second list so that the elements remain in corresponding order.🟡 Medium · Coding · Asked 1×Requirement: sort the first list and reorder the second list to keep corresponding values.🟡 Medium · Coding · Asked 1×Given the string `text = "python is easy and python is powerful"`, count the words and store the counts in a dictionary using Python.🟢 Easy · Coding · Asked 1×How do you implement a binary tree?🟢 Easy · Coding · Asked 1×Can you explain binary trees?🟢 Easy · Conceptual · Asked 1×Write code for a 2D array.🟢 Easy · Coding · Asked 1×Define a 2D array.🟢 Easy · Conceptual · Asked 1×Given the list list1 = [1, 2, 2, 3, 1, 4, 2, 3], find the frequency of each element without using existing functions.🟢 Easy · Coding · Asked 1×Given the dictionary ab = {'b':2,'a':3,'c':1}, sort it by values to obtain {'c':1,'b':2,'a':3} and by keys to obtain {'a':3,'b':2,'c':1}.🟢 Easy · Coding · Asked 1×

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Data Structures Interview Questions

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