GIIT Solutions AWS Cloud Engineer Interview Questions and Answers

Simple DBMS and DSA Questions

Q1. String Manipulations
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Q2. Linked lists questions
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Coding round consisting DSA portion mainly.

Q1. SQL questions on Joins
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Q2. Problems given on Hacker rank
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Q1. Sorting related questions
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Q2. Tell me about yourself, family background, hobbies
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Coding test around front end using react

Round duration - 60 minutes
Round difficulty - Easy

Timing: Morning
Environment: Online
Description: This round was conducted immediately after Aptitude Round if you cleared it. 4 Questions in 60 minutes.

Q1. 
MergeSort Linked List Problem Statement
You are given a Singly Linked List of integers. Your task is to sort the list using the 'Merge Sort' algorithm.
Input:
The input consists of a single line contain...read more
Ans. 
Sort a Singly Linked List using Merge Sort algorithm.
• Implement the Merge Sort algorithm for linked lists.

• Divide the list into two halves, sort each half recursively, and then merge them.

• Make sure to handle the base case of an empty or single-node list.

• Example: Input: 4 3 2 1 -1, Output: 1 2 3 4
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Q2. 
Rotate Array Problem Statement
The task is to rotate a given array with N elements to the left by K steps, where K is a non-negative integer.
Input:
The first line contains an integer N representing the...read more
Ans. 
Rotate a given array to the left by K steps.
• Create a new array to store the rotated elements.

• Use modular arithmetic to handle cases where K is greater than the array size.

• Shift elements to the left by K steps and update the new array.

• Return the rotated array as output.
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Q3. 
Problem: Permutations of a String
Given a string STR consisting of lowercase English letters, your task is to return all permutations of the given string in lexicographically increasing order.
Explanatio...read more
Ans. 
Return all permutations of a given string in lexicographically increasing order.
• Use backtracking to generate all permutations of the string.

• Sort the permutations in lexicographical order before printing.

• Ensure the string contains unique characters for correct output.

• Handle multiple test cases by iterating over each case.
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Q4. 
Factorial Calculation Problem
Given an integer N, determine the factorial value of N. The factorial of a number N is the product of all positive integers from 1 to N.
Input:
First line of input: An inte...read more
Ans. 
Calculate factorial of a given number N.
• Iterate from 1 to N and multiply each number to get the factorial value.

• Handle edge cases like N=0 or N=1 separately.

• Use recursion or iteration to calculate factorial efficiently.
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Round duration - 40 minutes
Round difficulty - Medium

Timing: Morning
Environment: Online

Q1. 
Print Series Problem Statement
Given two positive integers N and K, your task is to generate a series of numbers by subtracting K from N until the result is 0 or negative, then adding K back until it reac...read more
Ans. 
Generate a series of numbers by subtracting K from N until 0 or negative, then adding K back to reach N without using loops.
• Create a recursive function to generate the series.

• Subtract K from N until N is 0 or negative, then add K back until N is reached.

• Return the series as an array of integers.
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Q2. 
Unique Element In Sorted Array
Nobita wants to impress Shizuka by correctly guessing her lucky number. Shizuka provides a sorted list where every number appears twice, except for her lucky number, which a...read more
Ans. 
Find the unique element in a sorted array where all other elements appear twice.
• Iterate through the array and XOR all elements to find the unique element.

• Use a hash set to keep track of elements and find the unique one.

• Sort the array and check adjacent elements to find the unique one.
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Q3. 
Find the Second Largest Element
Given an array or list of integers 'ARR', identify the second largest element in 'ARR'.
If a second largest element does not exist, return -1.
Example:
Input:
ARR = [2,...read more
Ans. 
Find the second largest element in an array of integers.
• Iterate through the array to find the largest and second largest elements.

• Handle cases where all elements are identical.

• Return -1 if a second largest element does not exist.
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Q4. Write a query to find the Nth highest salary along with the employee name.
Ans. 
Query to find the Nth highest salary with employee name
• Use a subquery to rank the salaries in descending order

• Select the distinct salary from the subquery with LIMIT N-1, 1 to get the Nth highest salary

• Join the main table with the subquery on the salary column to get the employee name
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Round duration - 25 minutes
Round difficulty - Easy

Timing: It was in the morning then rescheduled to evening
Environment: Online

Q1. 
Remove String from Linked List Problem
You are provided with a singly linked list where each node contains a single character, along with a string 'STR'. Your task is to remove all occurrences of the stri...read more
Ans. 
Remove all occurrences of a specified string from a singly linked list by checking from the end of the list.
• Traverse the linked list from the end to efficiently remove the specified string occurrences.

• Update the pointers accordingly after removing the string to maintain the integrity of the linked list.

• Consider edge cases such as when the entire linked list contains the specified string.

• Use a temporary buffer to keep t
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There were 19 questions consists of aptitude and technical subject. Then 2 codes were there . Then 1 code of SQL query .

Q1. Technical Interview 45min Introduce yourself Projects included in Resume Discussion on Projects Mentioned in projects Two coding questions -----+all+permutation+of+a+string+geeksforgeeks -----/ 2 Puzzle
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Q2. -----+all+permutation+of+a+string+geeksforgeeks -----/
Ans. 
Generate all permutations of a given string using recursion and backtracking.
• Use recursion to generate all possible permutations of the string.

• Use backtracking to backtrack and explore all possible combinations.

• Store each permutation in an array of strings.
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Q1. Technical Interview 45 min Introduce yourself Projects included in Resume Discussion on Projects Mentioned in projects Two coding questions -----+a+string+geeksforgeeks -----/ 3 Puzzle
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Q1. Technical + HR 1 hrs Introduce yourself Projects included in Resume Discussion on Projects Mentioned in projects 3 coding questions ----- ----- ----- 2 Puzzle
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Medium level array question was asked on hackerrank.

Q1. Simple string question was asked which required a little thinking and simple implementation.
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Q1. This was a coding round. I was given a screenshot which has dropdowns in it and I had to make the UI of it using react.js
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It was medium lavel aptitude test and it included coding assessments

Q1. Graph based question were asked
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Q2. Coding based and some quiz based questions were asked.
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Q1. Basic Networking Concepts like OSl/TCP/IP models. Basic protocols.
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Q2. Current Windows and Android OS info with their differences from the past versions.
Ans. 
Windows and Android OS have evolved with new features and improvements compared to past versions.
• Windows 10 introduced a new Start menu and Cortana virtual assistant.

• Android 11 focused on improved privacy controls and messaging features.

• Both OS have enhanced security measures compared to their past versions.
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Q1. Networking Questions about devices and their functionality.
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Q2. Deep networking topics like Subnetting, NAT and their working.
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Q1. This a one-on-one final round with director. He himself was systems Engineer. Expect deep networking concept questions.
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