TO THE NEW Technical Trainee Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Medium

Timing: 1:00 PM
Environment: Online (Webcam + Mic on)
The interviewer was friendly, collaborative and to the point.

Q1. 
Find Two Non-Repeating Elements Problem Statement
Given an array of integers ARR with size N, where exactly two elements appear only once and all others appear exactly twice, identify and return the two u...read more
Ans. 
Given an array where all elements appear twice except two, find and return the two unique elements.
• Use XOR operation to find the XOR of all elements in the array, which will give the XOR of the two unique elements.

• Find the rightmost set bit in the XOR result to divide the array into two groups based on that bit.

• XOR each group separately to find the two unique elements.

• Example: For input [2, 4, 6, 8, 4, 2], XOR result i...read more
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Q2. 
String Palindrome Verification
Given a string, your task is to determine if it is a palindrome considering only alphanumeric characters.
Input:
The input is a single string without any leading or trailing...read more
Ans. 
Check if a given string is a palindrome considering only alphanumeric characters.
• Remove non-alphanumeric characters from the input string.

• Compare characters from start and end of the string to check for palindrome.

• Return true if the string is a palindrome, false otherwise.
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Q3. 
Word Occurrence Counting
Given a string 'S' of words, the goal is to determine the frequency of each word in the string. Consider a word as a sequence of one or more non-space characters. The string can h...read more
Ans. 
The goal is to determine the frequency of each word in a given string.
• Split the input string into individual words

• Create a dictionary to store word frequencies

• Iterate through the words and update the frequency count in the dictionary

• Print each unique word and its frequency
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Round duration - 40 minutes
Round difficulty - Easy

Timing (In Morning)
Environment (Same as Technical Interview)