Systenics Solutions Junior .NET Developer Interview Questions and Answers

Q1. Project questions
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Q2. Spring related questions
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DSA leetcode on hackerrank

Q1. I am freshers soo please one chance for your company
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Q2. Yes I am fresher soo for your company work
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Q3. Talk about a range of elements, including customer service.
Ans. 
Customer service is an essential element in software development.
• Customer service involves providing support and assistance to users of software applications.

• It includes addressing user queries, resolving issues, and ensuring customer satisfaction.

• Software developers may interact with customers through various channels like email, phone, or live chat.

• Good customer service can lead to positive user experiences and incre...read more
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Q1. What is web api
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Web API is a set of rules and protocols that allow different software applications to communicate with each other over the internet.
• Web API stands for Application Programming Interface for web-based applications

• It allows different software applications to interact with each other over the internet

• Web APIs use HTTP protocol to communicate and transfer data

• Examples of web APIs include Google Maps API, Twitter API, and Fa
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70 minutes test, and 4 questions

Q1. Behavioural Queston
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Round duration - 90 Minutes
Round difficulty - Medium

This round had 3 coding questions. The first two were of moderate level and the third one was a bit hard and was related to Dynamic Programming.

Q1. 
Maximum Number from Linked List Problem Statement
Given a linked list where each node contains a single digit, your task is to construct the largest possible number using these digits.
Objective:
Print ...read more
Ans. 
Approach : 

1) Traverse the linked list from start to end and make frequency array of all digits (0-9) present in the linked list.

2) Make the string starting from the maximum of digits (0-9) present in the linked list i.e first append all the 9’s in the answer string then append all the 8’s at the end of the answer string so on for all the other digits in the decreasing order. 

3) Finally, return the formed ans...read more
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Q2. 
Chocolate Distribution Problem
You are given an array/list CHOCOLATES of size 'N', where each element represents the number of chocolates in a packet. Your task is to distribute these chocolates among 'M'...read more
Ans. 
Approach : 

1) Suppose the given array is ‘CHOCOLATES’.

2) Sort the given array.

3) Find the subarray with the minimum difference of the last and first elements.

4) To store minimum difference we use a variable (say, ‘minVal’) and the initial value is ‘INFINITE’

5) Run a loop from 0 to ‘N’ - ‘M’ - 1(say, iterator ‘i’)

6) If 'CHOCOLATES'[i] - ‘CHOCOLATES’[i - M + 1] is less than ‘minVal’ then update ‘minVal’ with ‘CHOCOL...read more
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Q3. 
LCS of Three Strings Problem Statement
Given three strings A, B, and C, determine the length of the longest common subsequence present in all three strings.
Explanation:
A subsequence is derived by dele...read more
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Approach : 

1) The idea is to create a 3-D DP of size n*m*k.

2) Initially, all the elements of the DP table will be 0.

3) Now, the value DP[i][j] means denotes the length of the longest common sub-sequence of string A[0..i], B[0..j], and C[0..k].

4) The detailed algorithm to fill the DP table will be as follows:

Loop 1: For i = 1 to N:
Loop 2: For j = 1 to M:
Loop 3: For k = 1 to K:

if(A[i] == B[j] == C[k] ), DP[i][j][k] ...read more
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Round duration - 60 Minutes
Round difficulty - Medium

This round had 2 questions of DS/Algo to solve under 60 minutes and 2 questions related to Operating Systems.

Q1. 
Buy and Sell Stock Problem Statement
Imagine you are Harshad Mehta's friend, and you have been given the stock prices of a particular company for the next 'N' days. You can perform up to two buy-and-sell ...read more
Ans. 
Approach : 

1) Initialize variables 'FIRSTBUY' as the minimum negative value, ‘FIRSTSELL’ as 0, ‘SECONDBUY’ as the minimum negative value, and ‘SECONDSELL’ as 0.
‘FIRSTSELL’ will be the profit after the first transaction and ‘SECONDSELL’ will be the profit after the second transaction.

2) For ‘i’ in range days:
2.1) Maximise 'FIRSTBUY' as max( 'FIRSTBUY' , - ‘PRICES[i]’), this is the amount left after your first buy.
2...read more
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Q2. 
Count Smaller People on Right
You are provided with an array called HEIGHT that contains the heights of 'N' people standing in a queue. For each person in the array, compute the number of individuals on t...read more
Ans. 
Approach : This question was similar to the famous problem "Count Inversions" and so I thought of applying Merge Sort here. 

1) By modifying the merging array part of merge sort, we can calculate the required ans.

2) During merging of two halves, when the higher index element is less than the lower index element, it represents that the higher index element is smaller than all the elements after that lower index beca...read more
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Q3. Can you define processes and threads in operating systems?
Ans. 
Process : A process is an instance of a program that is being executed. When we run a program, it does not execute
directly. It takes some time to follow all the steps required to execute the program, and following these execution
steps is known as a process.

A process can create other processes to perform multiple tasks at a time; the created processes are known as clone
or child process, and the main process is known as ...read more
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Q4. What are the different types of semaphores?
Ans. 
There are two main types of semaphores i.e. counting semaphores and binary semaphores.

1) Counting Semaphores :
These are integer value semaphores and have an unrestricted value domain. These semaphores are used to
coordinate the resource access, where the semaphore count is the number of available resources. If the resources
are added, semaphore count automatically incremented and if the resources are removed, the count i...read more
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Round duration - 60 Minutes
Round difficulty - Medium

This round had 3 coding questions in which I first had to explain my approach with proper complexity analysis and then code up the solution. I found the first problem to be a bit on the harder side compared to the rest of the 2 problems.

Q1. 
Longest Increasing Path in a 2D Matrix Problem Statement
Given a matrix of non-negative integers of size 'N x M', where 'N' and 'M' denote the number of rows and columns respectively, find the length of t...read more
Ans. 
Approach : 

1) We maintain a 2D array dp of size N*M. Since the increasing path can start from any point in the matrix, we use dp[i][j] to store the length of the longest increasing path starting from location (i, j). This ensures that we do not recalculate a visited location. 

2) Now, we perform a DFS from each cell with the current cell as (x, y). We compare the cells in the four directions (dx, dy) and skip ...read more
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Q2. 
Gas Station Tour Problem
You are presented with a circular track consisting of several petrol pumps. Each petrol pump is indexed from 0 to N-1 and offers certain attributes:
• The quantity of petrol ava...read more
Ans. 
Approach : 

1) We can choose every index to be our starting point and check whether we can complete the round trip starting from that index.

2) For each start point, we will run a loop starting from this index. If at any point, petrol available in the truck is not sufficient to move on to the next petrol pump, we know this is a bad starting point. So, we break the loop and try the same for the next start point.

3) As...read more
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Q3. 
Rabbit Jumping Problem
Consider 'n' carrots numbered from 1 to 'n' and 'k' rabbits. Each rabbit jumps to carrots only at multiples of its respective jumping factor A_j (i.e., A_j, 2A_j, 3A_j, ...), for all ra...read more
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Approach : 

1) Create a boolean array of size n + 1 with default value false.

2) Run a loop from i=0 to k. If A[i] is marked true then we don’t need to traverse its multiples as they have been already traversed. Else Traverse all multiples of A[i] less than n. The carrots which are visited mark it true.

3) After doing traversal count the values from 1 to n with false values. Return this value.


TC : O(N * log(max(A[i])
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Basic coding questions And logical questions

Simple program for mathematics

Q1. C# programs based on requirement
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Basic c# programs for valuations