Customer Analytics Software Engineer Interview Questions and Answers for Freshers

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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Not so much difficult. english comprehension matters for this test.

Q1. Departmental question asked.
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Q2. What is C++ and what are the basics
Ans. 
C++ is a high-level programming language used for developing system software, application software, and video games.
• C++ is an extension of the C programming language

• It supports object-oriented programming concepts like classes, inheritance, polymorphism, etc.

• It is a compiled language and provides low-level memory manipulation features

• C++ is widely used in developing operating systems, device drivers, game engines, and ...read more
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Q1. Proctored MCQ test
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Technical interview where DSA questions were asked

Q1. Manegerial round
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Q1. One on one HR round at the end
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Q1. Joins types. Rank functions
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Q2. SQL related questions. Joins , Rank , functions , Sps
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Q1. Roles and responsibilities.
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Q2. Project related questions. Your role and responsibilities .
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Q1. What are your salary expectations?
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Q2. Where do you see yourself in 5 years?
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Q3. What are your strengths and weaknesses?
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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
For a given Singly Linked List of integers, sort the list using the 'Merge Sort' algorithm.
Input format :
The first and the only line of input contains the elements of the...read more
Ans. Merge Sort Linked List
1. The idea is to take a recursive approach by calling the sort function on the left half and right half of the list.
2. In order to do so, get the middle node and split the list into two halves. We can use a two-pointer technique to get the middle node by running a slow and a fast pointer.
   1. The idea here is to move both the slow and fast pointer simultaneously until fast reaches the end of the list.
   2. Here, ...read more
Answered by CodingNinjas
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Q2. Rotate array
Given an array with N elements, the task is to rotate the array to the left by K steps, where K is non-negative.
Input Format:
The first line contains an integer N representing the size of ...read more
Ans. Naive Approach
• We rotate the array K times where in each iteration we rotate the array by 1.
• Rotating the array once can be done by changing input[i] to input[i+1] and appending the first character to the end.
Space Complexity: O(1)Explanation: Time Complexity: O(1)Explanation:
Answered by CodingNinjas
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Q3. Permutations of a String
You are given a string 'STR' consisting of lowercase English letters. Your task is to return all permutations of the given string in lexicographically increasing order.
S...read more
Ans. Backtracking
The idea is to fix a character at a position and then find the permutations for rest of the characters.
Make a list ‘ans’ which will contain the permutations of the given string.
 
Algorithm:
Let’s define a function generatePermutaionsHelper(Str, l, r). This function generates the permutations of the substring which starts from index  ‘l’ and ends at index  ‘r’.
• Call the function: generatePermutai...read more
Answered by CodingNinjas
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Q4. Factorial
You are given an integer ‘N’. You have to print the value of Factorial of ‘N’. The Factorial of a number ‘N’ is defined as the product of all numbers from 1 to ‘N’.
For Example:
Consider if ‘N...read more
Ans.  Using Linked List
In this approach, we will calculate the factorial of the given number and store it in the form of a Linked List of digits named digits. To do this, we will define a function multiply(digits,x) that will multiply the number corresponding to the digits with x and update the digits with the product’s value. Then we will initialize the linked list digits with 1 and multiply it with all numbers from 2 to N...read more
Answered by CodingNinjas
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Round duration - 40 minutes
Round difficulty - Medium

Timing: Morning
Environment: Online

Q1. Print Series
You have given two positive integers N and K. Your task is to print a series of numbers i.e subtract K from N until it becomes 0 or negative then add K until it becomes N. You need to do thi...read more
Ans. Recursion
The idea here is to use recursion,we can print current N two times in the current recursion stack. One for decreasing order and one for increasing order. 
 
Steps : 
 
• Declare an empty array to store our series, say answer.
• Define and call function series(answer, N, K), where N, and K is the given number.
• At last return answer.
 
void series(answer, N, K):
 
• Add N to answer.
• Base condition, ...read more
Answered by CodingNinjas
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Q2. Unique Element In Sorted Array
Nobita wants to impress Shizuka by guessing her lucky number.
Shizuka gave Nobita a sorted list of ‘N’ numbers such that every number occurred twice in the list except Shiz...read more
Ans. Brute force
The idea here is to use the fact that the array is sorted and the element of the array (‘arr[i]’) is unique if it doesn't have an adjacent element that has the same value as ‘arr[i]’. 
 
Algorithm:
• If the length of the array equal to 1 then return ‘arr[0]’.
• Declare a variable ‘answer’ to store Shizuka’s lucky number.
• Run a loop from i = 0 to the length of the array - 1.
• If ‘arr[i]’ does not have an adjac...read more
Answered by CodingNinjas
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Q3. Second largest element in the array
You have been given an array/list 'ARR' of integers. Your task is to find the second largest element present in the 'ARR'.
Note:
a) Duplicate elements ...read more
Ans. Simple solution
The idea is to sort the array in decreasing order and return the second largest element in the array.
1. Sort the array in decreasing order.
2. We can create a function to sort the elements using a sorting algorithm such as quicksort or use inbuilt sorting functions.
3. Traverse from index 1(0-based indexing) because the element at index 0 will clearly be the first largest and check whether duplicates of the larger ...read more
Answered by CodingNinjas
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Q4. SQL Question
write-a-query-to-find-the-nth-highest-salary-and-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
You have been given a linked list where each node has a single character. You have also been given a string 'STR'.
You have to remove all the occurrences of string STR from the link...read more
Ans. Remove String
Starting from the head of the linked list make recursive calls until you reach the end of a linked list. Store the address of the head of the linked list in a pointer. Now you reach the end of the linked list and while backtracking, try to match the corresponding character of the string with the data stored in the current pointer ‘TEMP’ in linked list char by char. 
 
If found then simply return th...read more
Answered by CodingNinjas
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Q2. SQL Question
Employee table
~~~~~~~~~~~~~~~~
empid, deptid, empname, empsalary

Department table
~~~~~~~~~~~~~~~~~
deptid, depname

Output:
depname, total salary (dep wise) 

conditions
~~~~~~~~~~~~
such that only ...read more
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