TCS iON System Engineer Interview Questions, Process, and Tips

Round duration - 180 minutes
Round difficulty - Easy

--> Aptitude test with questions on Quants, Logical reasoning and English.
--> 2 easy level coding questions.

Q1. 
Reverse Linked List Problem Statement
Given a Singly Linked List of integers, your task is to reverse the Linked List by altering the links between the nodes.
Input:
The first line of input is an intege...read more
Ans. 
Reverse a singly linked list by altering the links between nodes.
• Iterate through the linked list and reverse the links between nodes

• Use three pointers to keep track of the current, previous, and next nodes

• Update the links while traversing the list to reverse it

• Return the head of the reversed linked list
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Q2. 
GCD (Greatest Common Divisor) Problem Statement
You are given two numbers, X and Y. Your task is to determine the greatest common divisor of these two numbers.
The Greatest Common Divisor (GCD) of two in...read more
Ans. 
The greatest common divisor (GCD) of two numbers is the largest positive integer that divides both numbers without leaving a remainder.
• Use Euclidean algorithm to find GCD efficiently

• GCD(X, Y) = GCD(Y, X % Y)

• Repeat until Y becomes 0, then X is the GCD
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Round duration - 30 minutes
Round difficulty - Medium