Tata Consultancy Services (TCS) interview experience Real time questions & tips from candidates to crack your interview
Software Developer
Tata Consultancy Services (TCS)
2 rounds | 2 Coding
problems
Selected Interview preparation journey
Preparation
Duration: 6 months
Topics: Data Structures, OOPS, Algorithms, Dynamic Programming, Quantitative aptitude, Logical Reasoning, Verbal Ability
Tip 1 : Practice at least 200 questions from Leetcode and Hackerrank
Tip 2 : Practice variety of questions from different topics and wo medium and hard difficulty level.
Tip 3 : Do at least 2 projects to be mentioned in your resume.
Application process
Where: Campus
Eligibility: 6.5 CGPA and above, not more than one backlog (which has to be cleared before joining TCS)
Tip 1 : Have some projects on your resume
Tip 2 : Craft your resume according to the role for which you are applying
Interview rounds
01
Round
Medium
Online Coding Interview
Duration180 minutes
Interview date9 Oct 2020
Coding problem1
The first round was an online take-from-home test with MCQs on Quants, Logical Reasoning, Verbal Ability and two advanced coding questions section at the end. We were given a few window slots during which we could take the test for 180 minutes. The test was of medium difficulty level and I was able to clear the test.
1. Zigzag Binary Tree Traversal
Easy
10m average time
90% success
0/40
Asked in companies
You are given a ‘Binary Tree’.
Return the level-order traversal of the Binary Tree.
Example:
Input: Consider the following Binary Tree:
Output:
Following is the level-order traversal of the given Binary Tree: [1, 2, 3, 5, 6, 4]
Problem approach
Step 1: I used a queue for Level Order Traversal.
Step 2: I used a flag variable which keeps track of alternate levels to reverse the order of the corresponding level traversal.
Step 3: flag==true implies we have to insert from left to right and flag==false means we have to insert an element from right to left our answer ArrayList.
02
Round
Medium
Video Call
Duration180 minutes
Interview date11 Nov 2020
Coding problem1
The second round was a video call interview round which consisted of two sub-rounds, that is, the technical round and the HR round. The technical round consisted of coding questions and questions from my projects. The HR round consisted of cultural fit and behavioural questions. I was able to satisfy both the technical interviewer and HR with my responses.
1. Reverse the String
Easy
15m average time
85% success
0/40
Asked in companies
You are given a string 'STR'. The string contains [a-z] [A-Z] [0-9] [special characters]. You have to find the reverse of the string.
For example:
If the given string is: STR = "abcde". You have to print the string "edcba".
follow up:
Try to solve the problem in O(1) space complexity.
Problem approach
Step 1: Create a temporary byte[] of length equal to the length of the input string.
Step 2: Store the bytes (which we get by using the getBytes() method) in reverse order into the temporary byte[].
Step 3: Create a new String object using byte[] to store result.
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Skill covered: Programming
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