Why do Interviewers care so much about Algorithm and Data Structures?

Data Structures and Algorithms are one of the most important skills that every computer science student must-have. It is often seen that people with good knowledge of these technologies are better programmers than others.

Choosing the correct data structure or algorithm to solve a particular problem affects a lot on the efficiency of the solution.

Let’s see how?

Consider the scenario of an interview, where two programmers A and B applied for a software developer role and were asked to solve the below problem.

Problem: Given a sorted array and a key to search. Check if the key is present in the array or not.

Programmer A solves the above problem by performing a linear search operation and programmer B solves the above problem by performing Binary Search operation.

After the results are announced, programmer B got selected and programmer A got rejected.

What went wrong with programmer A?

The solutions of both of the programmers A and B were correct, but programmer B is found to be efficient and more proficient in using the correct data structure and algorithms to solve a particular problem given. The problem mentioned above takes

O(N)

O(LogN)

Some surveys conducted about the salary reports of software developers in India says that anyone who has a good and fair understanding of how data structures and algorithms work earns around 20–30 Lakhs per annum.

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