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Rakuten Sde1 Interview Questions and Answers

Updated 12 Dec 2021

Rakuten Sde1 Interview Experiences

1 interview found

Sde1 Interview Questions & Answers

user image Anonymous

posted on 30 Nov 2021

I applied via Campus Placement and was interviewed in Jun 2021. There was 1 interview round.

Interview Questionnaire 

2 Questions

  • Q1. What all projects have you worked on? What all Tech Stack you have experience?
  • Q2. Basic RDBMS queries like how to find the second highest salary of a table with employee data.

Interview Preparation Tips

Interview preparation tips for other job seekers - They mainly look into your resume and ask on basis of that so if you have Java as top skill you will be asked questions upon Java .
I had React as my main strength so all my questions are mainly focused on that.

Interview questions from similar companies

Sde1 Interview Questions & Answers

Amazon user image Anonymous

posted on 12 Aug 2017

I appeared for an interview in Aug 2017.

Interview Questionnaire 

16 Questions

  • Q1. -----/ But here the main thing is that handling of corner cases like when there are duplicate tickets and when there is no proper path possible with given tickets
  • Q2. N queen problem with problem statement and dry running of code with 4 queens and then writing the code
  • Ans. 

    N queen problem is to place N queens on an NxN chessboard without any two queens threatening each other.

    • The problem can be solved using backtracking algorithm

    • Start with placing a queen in the first row and move to the next row

    • If no safe position is found, backtrack to the previous row and try a different position

    • Repeat until all queens are placed or no safe position is found

    • Code can be written in any programming langua...

  • Answered by AI
  • Q3. Sub set problem(Check if there exists any sub array with given sum in the array ) . But the thing here is that we have to do it with space complexity of only O( 1 K ) . K is the sum given .
  • Ans. 

    Check if there exists any sub array with given sum in the array with O(1K) space complexity.

    • Use two pointers to traverse the array and maintain a current sum.

    • If the current sum is greater than the given sum, move the left pointer.

    • If the current sum is less than the given sum, move the right pointer.

    • If the current sum is equal to the given sum, return true.

  • Answered by AI
  • Q4. What is NP hardness .
  • Ans. 

    NP hardness refers to the difficulty of solving a problem in non-deterministic polynomial time.

    • NP-hard problems are some of the most difficult problems in computer science.

    • They cannot be solved in polynomial time by any known algorithm.

    • Examples include the traveling salesman problem and the knapsack problem.

  • Answered by AI
  • Q5. What is the difference between references and pointers
  • Ans. 

    References and pointers are both used to access memory locations, but references cannot be null and cannot be reassigned.

    • Pointers can be null and can be reassigned to point to different memory locations.

    • References are automatically dereferenced, while pointers need to be explicitly dereferenced.

    • Pointers can perform arithmetic operations, while references cannot.

    • Example: int x = 5; int *ptr = &x; int &ref = x;

    • Example: i

  • Answered by AI
  • Q6. What is difference between reference variable and actual reference
  • Ans. 

    A reference variable is a variable that holds the memory address of an object, while an actual reference is the object itself.

    • A reference variable is declared with a specific type and can only refer to objects of that type.

    • An actual reference is the object itself, which can be accessed and manipulated using the reference variable.

    • Changing the value of a reference variable does not affect the original object, but changi...

  • Answered by AI
  • Q7. In this round he asked me about previous round questions and their time complexities also . and with every DS and Algo related questions they asked the time complexities
  • Q8. Segmentation , virtual memory , paging
  • Q9. 0-1 Knapsack problem
  • Q10. What happens when we type an URL
  • Ans. 

    When we type an URL, the browser sends a request to the server hosting the website and retrieves the corresponding webpage.

    • The browser parses the URL to extract the protocol, domain, and path.

    • It resolves the domain name to an IP address using DNS.

    • The browser establishes a TCP connection with the server.

    • It sends an HTTP request to the server.

    • The server processes the request and sends back an HTTP response.

    • The browser re

  • Answered by AI
  • Q11. Implementation of LRU (WIth Production level code)
  • Ans. 

    Implementation of LRU cache using a doubly linked list and a hash map.

    • LRU (Least Recently Used) cache is a data structure that stores a fixed number of items and evicts the least recently used item when the cache is full.

    • To implement LRU cache, we can use a doubly linked list to maintain the order of items based on their usage frequency.

    • We can also use a hash map to store the key-value pairs for quick access and retrie...

  • Answered by AI
  • Q12. Given page access sequence and we have to tell final output using different page replacement algorithms like FIFO , LRU etc
  • Q13. What is indexing in DBMS How do we maintain it
  • Ans. 

    Indexing in DBMS is a technique to improve query performance by creating a data structure that allows faster data retrieval.

    • Indexing is used to speed up data retrieval operations in a database.

    • It involves creating a separate data structure that maps the values of a specific column to their corresponding records.

    • This data structure is called an index.

    • Indexes are typically created on columns that are frequently used in s...

  • Answered by AI
  • Q14. B trees , B+ trees with examples
  • Ans. 

    B trees and B+ trees are data structures used for efficient storage and retrieval of data in databases.

    • B trees are balanced trees with a variable number of child nodes per parent node. They are commonly used in databases to store large amounts of data.

    • B+ trees are a variant of B trees where all data is stored in the leaf nodes, and the internal nodes only contain keys. They are commonly used in databases for indexing.

    • B...

  • Answered by AI
  • Q15. AVL trees with examples and their balancing
  • Ans. 

    AVL trees are self-balancing binary search trees. They maintain a balance factor to ensure height balance.

    • AVL trees are named after their inventors, Adelson-Velsky and Landis.

    • They are height-balanced, meaning the difference in height between left and right subtrees is at most 1.

    • Insertion and deletion operations may cause imbalance, which is corrected by rotations.

    • AVL trees have a worst-case time complexity of O(log n) ...

  • Answered by AI
  • Q16. Pid ={3,5,0,1} ppid ={5,4,2,2} process id(pid) ppid=parent process id let us say the process that we killed is 2 now we have to print 2,0,1 as 0,1 are child of 2 and suppose that if we have children f...
  • Ans. 

    Given a list of process IDs and their corresponding parent process IDs, print the IDs of all processes that are children of a specific process ID, and recursively kill all their children.

    • Iterate through the list of process IDs and parent process IDs

    • Check if the current process ID is the one to be killed

    • If yes, recursively find and print all its children

    • If a child has further children, recursively kill them as well

  • Answered by AI

Interview Preparation Tips

Round: WRITTEN
Experience: It is a written round .

We are given with 2 coding questions of 10 marks each .There is no negative marking for coding questions

1)Given a string you have to partition the string in such a manner that each part of the partitioned string is a palindrome in itself and you have to count the number of such partition

For eg: given string NITIN
N ITI N
N I T I N
NITIN
So output will be 3.

2)You are given with a large paragraph and N words.
You have to find a min length subparagraph of the paragraph which contain all those N words in any order. Here length of a paragraph is the count of words in the paragraph.

There are 20 MCQ's all are technical questions only majorly from DSA
Tips: Coding it comes from practice . And for aptitude be good at fundamentals like time complexities etc .

Round: Technical Interview
Experience: Some times luck in interview is also important .I was unable to solve the second question initially ,but later with the help of my interviewer I was able to solve it .
Tips: Even if you are not able to solve the question initially don't be panic it will definitely go well

Round: Technical Interview
Experience: There are so many other questions . But sorry to say that I don't remember all of them ,if I remember them at some other time I will again update it here .

This round interviewer was very nice person And he is very helpful in fact .
Tips: Have solid basics at all data structures and algorithms ,Operating Systems


Round: Technical Interview
Experience: This round is entirely about other CS subjects like OS , DBMS,Networking .

Here asked me do you know other CS subjects like compiler design etc .
But as I am from Electronics I told them that I don't know all those subjects
Tips: Be good at other Cs subjects also

Round: Technical Interview
Experience: I solved above question Using DFS .I constructed a Graph using given information . and I did DFS starting from Given process .In the graph I took each process as 1 Node and the corresponding parent child relationship between the process as edges .
Tips: They will give sufficient time for thinking of the solution . So don't worry immediately after seeing the question . First think well you will definitely get it

Skills: Algorithms And DataStructures, Algorithm Analysis, Operating Systems, Basic Knowledge Of DBMS, Networking Basics, Object Oriented Programming (OOP) Basics
College Name: MNIT

Skills evaluated in this interview

Sde1 Interview Questions & Answers

Blinkit user image Anonymous

posted on 14 Jan 2025

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Not Selected

I applied via Referral and was interviewed in Jul 2024. There was 1 interview round.

Round 1 - Coding Test 

Hackerrank - 3 questions 2 hrs

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Referral and was interviewed before Jan 2024. There were 3 interview rounds.

Round 1 - Coding Test 

1 HR of coding round, 2 problems asked. One on stack, one on DP.

Round 2 - Coding Test 

Machine coding round where LLD implementation of a cab booking system was asked.

Round 3 - Behavioral 

(2 Questions)

  • Q1. Past projects were discussed at length
  • Q2. Behavioural questions were asked

Sde1 Interview Questions & Answers

Paytm user image Anonymous

posted on 20 Aug 2022

I applied via Company Website and was interviewed before Aug 2021. There were 2 interview rounds.

Round 1 - Coding Test 

Easy level questions

Round 2 - Technical 

(1 Question)

  • Q1. Oops,DBMS,os,dsa, difference between pointers and references

Interview Preparation Tips

Interview preparation tips for other job seekers - Do DSA very well
Don't ignore core computer subjects and all
Try standard problems of DSA atleast twice,can refer to strivers sde sheet

Sde1 Interview Questions & Answers

Paytm user image Anonymous

posted on 9 Dec 2022

I applied via Campus Placement

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Coding Test 

3 questions 1 is easy and 2 medium problems

Round 3 - Technical 

(2 Questions)

  • Q1. Check whether a linked list is palindrome
  • Ans. 

    Check if a linked list is palindrome

    • Traverse the linked list and push each element onto a stack

    • Traverse the linked list again and compare each element with the top of the stack

    • If all elements match, the linked list is a palindrome

  • Answered by AI
  • Q2. Diameter of a binary tree
  • Ans. 

    The diameter of a binary tree is the longest path between any two leaf nodes.

    • Calculate the height of left and right subtrees recursively

    • Find the diameter of left and right subtrees

    • Compare the diameter of left and right subtrees and return the maximum

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - follow gfg,leetcode.do problems in leetcode,coding ninjas.

Skills evaluated in this interview

Sde1 Interview Questions & Answers

Paytm user image Anonymous

posted on 29 Jul 2023

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Campus Placement and was interviewed before Jul 2022. There were 5 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Don’t add your photo or details such as gender, age, and address in your resume. These details do not add any value.
View all tips
Round 2 - Coding Test 

3 questions were asked. 1 easy 1 medium 1 hard

Round 3 - Coding Test 

One on one coding round. Basic easy to medium coding questions were asked

Round 4 - One-on-one 

(2 Questions)

  • Q1. Some coding questions and CS fundamentals were asked
  • Q2. Projects I had worked on in college
Round 5 - HR 

(1 Question)

  • Q1. Basic HR questions were asked

Interview Preparation Tips

Interview preparation tips for other job seekers - Practice leetcode top 150 interview questions.

Sde1 Interview Questions & Answers

Amazon user image Anonymous

posted on 1 Jul 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

1. Question on Graph LC-Hard 2. Question on BFS LC-Medium

Round 2 - One-on-one 

(2 Questions)

  • Q1. 1. Minimum platforms GFG
  • Q2. Find missing number in array without extra space
  • Ans. 

    Find missing number in array without extra space

    • Iterate through the array and XOR all the elements with their indices and the actual numbers

    • The missing number will be the XOR result

    • Example: ['1', '2', '4', '5'] -> XOR(0, 1) ^ XOR(1, 2) ^ XOR(2, 4) ^ XOR(3, 5) = 3

  • Answered by AI
Round 3 - One-on-one 

(2 Questions)

  • Q1. Question on Heap
  • Q2. Implement Heap in C++
  • Ans. 

    Implementing Heap data structure in C++

    • Use an array to represent the binary tree structure of the heap

    • Implement functions for inserting elements, deleting elements, and heapifying the array

    • Ensure that the heap property is maintained (parent node is always greater than or equal to its children)

  • Answered by AI
Round 4 - One-on-one 

(2 Questions)

  • Q1. Implement LRU Cache
  • Ans. 

    LRU Cache is a data structure that stores a fixed number of items and removes the least recently used item when the cache is full.

    • Use a combination of a doubly linked list and a hashmap to efficiently implement LRU Cache.

    • Keep track of the least recently used item at the tail of the linked list.

    • When an item is accessed, move it to the head of the linked list to mark it as the most recently used item.

    • When adding a new it...

  • Answered by AI
  • Q2. Discussion on CV and previous projects
Round 5 - One-on-one 

(1 Question)

  • Q1. Easy LLD question

Skills evaluated in this interview

Sde1 Interview Questions & Answers

Amazon user image Anonymous

posted on 11 Oct 2021

I applied via Referral and was interviewed in Apr 2021. There were 4 interview rounds.

Interview Questionnaire 

5 Questions

  • Q1. 2 variable variation of LIS
  • Ans. 

    2 variable variation of LIS

    • The problem involves finding the longest increasing subsequence in two arrays

    • Dynamic programming can be used to solve the problem

    • The time complexity of the solution is O(n^2)

    • Example: Given two arrays [1, 3, 5, 4] and [2, 4, 3, 5], the longest increasing subsequence is [3, 5]

    • Example: Given two arrays [10, 22, 9, 33, 21, 50, 41, 60] and [5, 24, 39, 60, 15, 28, 27, 40], the longest increasing su

  • Answered by AI
  • Q2. House robber 3
  • Ans. Solved it with top down dp
  • Answered Anonymously
  • Q3. Search in rotated sorted array
  • Ans. 

    Search for an element in a rotated sorted array.

    • Use binary search to find the pivot point where the array is rotated.

    • Compare the target element with the first element of the array to determine which half to search.

    • Perform binary search on the selected half to find the target element.

    • Time complexity: O(log n), Space complexity: O(1).

  • Answered by AI
  • Q4. First non repeating character in continuous character stream
  • Ans. 

    Find the first non-repeating character in a continuous character stream.

    • Use a hash table to keep track of character frequency.

    • Iterate through the stream and check if the current character has a frequency of 1.

    • If yes, return the character as the first non-repeating character.

    • If no non-repeating character is found, return null or a default value.

  • Answered by AI
  • Q5. One priority queue question

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare Data structures and algorithms well, Answer managerial questions using STAR methodologies.

Skills evaluated in this interview

Sde1 Interview Questions & Answers

Amazon user image Anonymous

posted on 16 Nov 2021

I applied via Campus Placement and was interviewed in May 2021. There was 1 interview round.

Interview Questionnaire 

1 Question

  • Q1. Medium DSA questions based on trees, linked lists and 1 graph

Interview Preparation Tips

Interview preparation tips for other job seekers - DSA was the only thing needed in my interview so being consistent with Leetcode, giving weekly contests(at least attempting Hard level qns even if not completing them) was really helpful.

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