Tata Consultancy Services (TCS) interview experience Real time questions & tips from candidates to crack your interview
SDE - 1
Tata Consultancy Services (TCS)
2 rounds | 3 Coding
problems
Rejected
Interview preparation journey
Preparation
Duration: 3 months
Topics: Data Structures, Pointers, OOPS, System Design, Algorithms, Dynamic Programming , DBMS.
Tip 1 : Practice At least 250 Questions
Tip 2 : Ex- Do at least 2 projects
Application process
Where: Campus
Eligibility: 6.5 CGPA
Tip 1 : Have some projects on resume.
Tip 2 : Do not put false things on resume
Interview rounds
01
Round
Medium
Online Coding Interview
Duration150 minutes
Interview date10 Sep 2022
Coding problem2
There were 3 sections
1) Verbal Ability
2) Quantitative and Aptitude
3) Coding round
1. Print All Subsets
Easy
20m average time
80% success
0/40
Asked in companies
You are given an array ‘arr’ of ‘N’ distinct integers. Your task is to print all the non-empty subsets of the array.
Note: elements inside each subset should be sorted in increasing order. But you can print the subsets in any order, you don’t have to specifically sort them.
Problem approach
I have solve this question using Recursion :
Base condition: If the “index” is equal to the size of the nums array then add our current subset array to the final answer because now we cannot traverse the nums array anymore.
We have two choices now
Skip the current element and call the recursive function with index+1 and all other arguments will remain the same.
Add the current element to the current subset and call the recursive function with index +1 and other arguments. After calling the recursive function, do the backtracking step by removing the last element from the current subset.
Print the final answer.
2. Modular Exponentiation
Easy
15m average time
85% success
0/40
Asked in companies
You are given a three integers 'X', 'N', and 'M'. Your task is to find ('X' ^ 'N') % 'M'. A ^ B is defined as A raised to power B and A % C is the remainder when A is divided by C.
Problem approach
The problem was basic. We have to calculate exponents first . then we have to take modulus of that question.
The problem in this question was constraints. That's why TLE chances were higher. That's why fast exponential method is used here.
02
Round
Easy
Face to Face
Duration20 minutes
Interview date21 Sep 2021
Coding problem1
I was asked questions about some DS algo theory questions , from my project , 1 coding problem
1. Rotate Linked List
Moderate
25m average time
65% success
0/80
Asked in companies
You are given a linked list having ‘n’ nodes and an integer ‘k’.
You have to rotate the linked list to the right by ‘k’ positions .
Example :
Input: linked list = [1 2 3 4] , k = 2
Output: 3 4 1 2
Explanation:
We have to rotate the given linked list to the right 2 times. After rotating it to the right once it becomes 4->1->2->3. After rotating it to the right again, it becomes 3->4->1->2.
Problem approach
To rotate the linked list, we need to change the next of kth node to NULL, the next of the last node to the previous head node, and finally, change the head to (k+1)th node. So we need to get hold of three nodes: kth node, (k+1)th node, and last node.
Traverse the list from the beginning and stop at kth node. Store pointer to kth node. We can get (k+1)th node using kthNode->next. Keep traversing till the end and store a pointer to the last node also. Finally, change pointers as stated above
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
Skill covered: Programming
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