Paxcom India Software Developer Interview Questions and Answers

Q1. MCQ test. 20 questions were asked and attempted in 30 minutes.
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1hr duration, test can be attempted in any language. I have attempted in python.

Basic coding question on array and string.

Code Snept question with 3-4 Reasoning question. Google form

Pen paper coding round. String , Array . Linkedlist , graph, questions

Q1. Maximum Spaning
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Q2. Nearest Prime number
Ans. 
To find the nearest prime number, iterate from the given number in both directions until a prime number is found.
• Start iterating from the given number in both directions to find the nearest prime number.

• Check if a number is prime by dividing it by all numbers less than its square root.

• Keep track of the closest prime number found during the iteration.
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Q3. Second Maximum Number in Array
Ans. 
Find the second maximum number in an array of strings.
• Convert the array of strings to an array of integers.

• Sort the array in descending order.

• Return the second element in the sorted array.
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Q1. Project Question
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Q2. Robot question of DSA
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Q3. Stock Buy and sell - VI . Leetcode Hard
Ans. 
Maximize profit by buying and selling stocks with at most k transactions.
• Use dynamic programming to track profits for each transaction.

• Maintain an array to store maximum profit for each day.

• Example: For prices [3,2,6,5,0,3] and k=2, max profit is 7.

• Consider edge cases like k=0 or prices being empty.
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Q4. Leetcode Medium
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5 coding questions in the first round

Q1. About yourself , about your project explaination.
Ans. Explianation about your project they'll ask fine details also.
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Q2. Find prime numbers value.
Ans. 
A prime number is a number greater than 1 that is divisible only by 1 and itself.
• Start with a loop to iterate through numbers

• Check if each number is divisible by any number from 2 to its square root

• If not divisible, add it to the list of prime numbers
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Basic Aptitude questions mainly on quantitative

Google docs was shared which has 5 coding questions mainly on array and string.

Q1. Interviewer introduced himself , then told the flow of interview ie. 2 coding question will be asked then he asked to introduce myself
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Q2. Occurance of characters in string
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Q3. Angle between hour and minute hand of clock at a given time
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Q4. Both question I was able to solve quickly interview was sheduled for one hour but i solved questions in 23 minutes so interview ended. I was called for second techinal round
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Q1. Same format as above introduction and 2 coding questions
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Q2. 1 Integer to roman it took me some time to solve the question
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Q3. 2 given sum and we have to print all the subsequences in array with given sum
Ans. 
Printing all the subsequences in an array with a given sum.
• Use recursion to generate all possible subsequences.

• Check if the sum of each subsequence is equal to the given sum.

• Print the subsequences that satisfy the condition.

• Time complexity: O(2^n).
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Q4. The interview took almost 45 minutes and i was able to solve both questions so i was selected for third round ie technical + HR
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Q1. First introduction then as all rounds 2 coding questions and then HR questions were asked
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Q2. 1 print string without taking repeating characters eg helper - helpr
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Q3. 2 sort array of 0s and 1s in only one loop solution was using two pointers
Ans. 
Sort an array of 0s and 1s in one loop using two pointers.
• Use two pointers, one starting from the beginning and the other from the end.

• Swap the values at the pointers if the value at the beginning pointer is greater than the value at the end pointer.

• Continue until the pointers meet in the middle.

• Time complexity is O(n).
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Q4. I solved both the questions then questions were asked on projects
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Q5. Difficulties in project how you learn new technology After two days I received mail and I was selected for software developer role
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Q1. First non repeating character in a string
Ans. 
Find the first non-repeating character in a string.
• Create a hash table to store character frequency

• Iterate through the string and update the hash table

• Iterate through the string again and return the first character with frequency 1
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Q2. Longest substring pallandrome in a string
Ans. 
Find the longest substring that is a palindrome in a given string.
• Use dynamic programming to solve the problem efficiently.

• Create a 2D boolean array to store the results of subproblems.

• Check for palindromes of length 1 and 2 separately.

• For substrings of length greater than 2, check if the first and last characters are the same and the substring between them is also a palindrome.

• Update the result if a longer palindrome ...read more
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DSA questions such as Map, linked list