Walmart
30+ ANSR Source Interview Questions and Answers
Q1. Working code with edge cases.
Working code with edge cases is code that has been tested with extreme inputs to ensure it functions correctly.
Edge cases are inputs that are unlikely to occur but can cause unexpected behavior if not handled properly.
Examples of edge cases include empty inputs, null values, and inputs at the limits of the data type's range.
Working code with edge cases should be thoroughly tested to ensure it functions correctly in all scenarios.
Q2. Nth Fibonacci Number Problem Statement
Given an integer 'N', the task is to compute the N'th Fibonacci number using matrix exponentiation. Implement and return the Fibonacci value for the provided 'N'.
Note:
Si...read more
Use matrix exponentiation to efficiently compute the Nth Fibonacci number modulo 10^9 + 7.
Implement matrix exponentiation to calculate Fibonacci numbers efficiently.
Use the formula F(n) = F(n-1) + F(n-2) with initial values F(1) = F(2) = 1.
Return the result modulo 10^9 + 7 to handle large Fibonacci numbers.
Optimize the solution to achieve better than O(N) time complexity.
Q3. Similar Strings Problem Statement
Determine whether two given strings, A
and B
, both of length N
, are similar by returning a 1 if they are, otherwise return a 0.
Explanation:
String A
is similar to string B
if ...read more
Determine if two strings are similar based on given conditions.
Check if the strings are equal first.
Then check if the strings can be divided into two halves with similar patterns.
Return 1 if the strings are similar, 0 otherwise.
Q4. Deepest Leaves Sum Problem Statement
Given a binary tree of integers, your task is to calculate the sum of all the leaf nodes present at the deepest level of this binary tree. If there are no such nodes, output...read more
Calculate the sum of leaf nodes at the deepest level of a binary tree.
Traverse the binary tree to find the deepest level of leaf nodes.
Sum the leaf nodes at the deepest level.
Handle null nodes represented by -1.
Ensure the sum fits within a 32-bit integer.
Q5. Palindrome Permutation - Problem Statement
Determine if a permutation of a given string S
can form a palindrome.
Example:
Input:
string S = "aab"
Output:
"True"
Explanation:
The permutation "aba" of the string ...read more
Check if a permutation of a string can form a palindrome.
Create a frequency map of characters in the string.
Count the number of characters with odd frequencies.
If there is at most one character with odd frequency, return true.
Otherwise, return false.
Q6. Word Presence in Sentence
Determine if a given word 'W' is present in the sentence 'S' as a complete word. The word should not merely be a substring of another word.
Input:
The first line contains an integer 'T...read more
Check if a given word is present in a sentence as a complete word.
Split the sentence into words using spaces as delimiter.
Check if the given word matches any of the words in the sentence.
Ensure that the word is not just a substring of another word in the sentence.
Q7. Remove Consecutive Duplicates Problem Statement
Given a string str
of size N
, your task is to recursively remove consecutive duplicates from this string.
Input:
T (number of test cases)
N (length of the string f...read more
Recursively remove consecutive duplicates from a given string.
Use recursion to check for consecutive duplicates in the string.
If current character is same as next character, skip the next character.
Repeat the process until no consecutive duplicates are found.
Q8. Write a for loop in cpp to print n natural numbers without using semicolon (;)
Use recursion to print n natural numbers in C++ without semicolon.
Define a function to print natural numbers recursively.
Call the function inside main function with n as argument.
Base case: if n is less than 1, return.
Print n and call the function with n-1 as argument.
Q9. Maximum Frequency Number Problem Statement
Given an array of integers with numbers in random order, write a program to find and return the number which appears the most frequently in the array.
If multiple elem...read more
Find the number with the maximum frequency in an array of integers.
Create a hashmap to store the frequency of each element in the array.
Iterate through the array to update the frequency count.
Find the element with the maximum frequency and return it.
If multiple elements have the same maximum frequency, return the one with the lowest index.
Q10. Take home project, with APIs fetch etc.
Develop a take home project involving fetching data from APIs
Create a project that fetches data from a public API such as weather forecast or news articles
Use libraries like Axios or Fetch API to make API calls
Display the fetched data in a user-friendly interface
Implement error handling for failed API calls
Q11. Ways To Make Coin Change
Given an infinite supply of coins of varying denominations, determine the total number of ways to make change for a specified value using these coins. If it's not possible to make the c...read more
The task is to find the total number of ways to make change for a specified value using given denominations.
Use dynamic programming to solve this problem efficiently.
Create a 2D array to store the number of ways to make change for each value using different denominations.
Initialize the base cases and then iterate through the denominations to fill up the array.
The final answer will be in the last cell of the array corresponding to the specified value.
Q12. Maximum Depth of a Binary Tree Problem Statement
Given the root node of a binary tree with N
nodes, where each node contains integer values, determine the maximum depth of the tree. The depth is defined as the ...read more
Find the maximum depth of a binary tree given its level order traversal.
Traverse the tree level by level and keep track of the depth using a queue data structure.
For each level, increment the depth by 1 until all nodes are processed.
Return the maximum depth encountered during traversal as the final result.
Example: For input [5, 10, 15, 20, -1, 25, 30, -1, 40, -1, -1, -1, -1, 45], the maximum depth is 7.
Q13. Sliding Window Maximum Problem Statement
You are given an array/list of integers with length 'N'. A sliding window of size 'K' moves from the start to the end of the array. For each of the 'N'-'K'+1 possible wi...read more
Sliding window maximum problem where we find maximum element in each window of size K.
Use a deque to store indices of elements in decreasing order within the window.
Pop elements from the deque that are out of the current window.
Add the maximum element to the result for each window.
Q14. Validate Binary Search Tree (BST)
You are given a binary tree with 'N' integer nodes. Your task is to determine whether this binary tree is a Binary Search Tree (BST).
BST Definition:
A Binary Search Tree (BST)...read more
Validate if a given binary tree is a Binary Search Tree (BST) or not.
Check if the left subtree of a node contains only nodes with data less than the node's data.
Check if the right subtree of a node contains only nodes with data greater than the node's data.
Recursively check if both the left and right subtrees are also binary search trees.
Example: For each node, ensure all nodes in its left subtree are less and all nodes in its right subtree are greater.
Q15. Duplicate Integer in Array
Given an array ARR
of size N
, containing each number between 1 and N-1
at least once, identify the single integer that appears twice.
Input:
The first line contains an integer, 'T', r...read more
Identify the duplicate integer in an array of size N containing numbers between 1 and N-1.
Iterate through the array and keep track of the frequency of each element using a hashmap.
Return the element with a frequency greater than 1 as the duplicate integer.
Ensure the constraints are met and a duplicate number is guaranteed to be present in the array.
Q16. Maximum Number With Single Swap
You are given an array of N elements that represent the digits of a number. You can perform one swap operation to exchange the values at any two indices. Your task is to determin...read more
Given an array of digits, find the maximum number that can be achieved by performing at most one swap.
Iterate through the array to find the maximum digit.
If the maximum digit is already at the beginning, find the next maximum digit and swap them.
If the maximum digit is not at the beginning, swap it with the digit at the beginning.
Q17. Next Smaller Element Problem Statement
You are provided with an array of integers ARR
of length N
. Your task is to determine the next smaller element for each array element.
Explanation:
The Next Smaller Elemen...read more
Find the next smaller element for each element in an array.
Iterate through the array from right to left and use a stack to keep track of elements.
Pop elements from the stack until a smaller element is found or the stack is empty.
If a smaller element is found, that is the next smaller element. If the stack is empty, there is no smaller element.
Q18. String Transformation Problem
Given a string (STR
) of length N
, you are tasked to create a new string through the following method:
Select the smallest character from the first K
characters of STR
, remove it fr...read more
Given a string, select smallest character from first K characters, remove it, and append to new string until original string is empty.
Iterate through the string, selecting the smallest character from the first K characters each time.
Remove the selected character from the original string and append it to the new string.
Repeat the process until the original string is empty.
Return the final new string formed after the operations.
Q19. Equilibrium Index Problem Statement
Given an array Arr
consisting of N integers, your task is to find the equilibrium index of the array.
An index is considered as an equilibrium index if the sum of elements of...read more
Find the equilibrium index of an array where sum of elements on left equals sum on right.
Iterate through the array and calculate prefix sum and suffix sum at each index.
Compare prefix sum and suffix sum to find equilibrium index.
Return the left-most equilibrium index found.
Q20. Graph Coloring Problem
You are given a graph with 'N' vertices numbered from '1' to 'N' and 'M' edges. Your task is to color this graph using two colors, such as blue and red, in a way that no two adjacent vert...read more
The problem is to color a graph with two colors such that no two connected vertices have the same color.
Use a graph coloring algorithm such as Depth First Search (DFS) or Breadth First Search (BFS).
Start with an arbitrary vertex and color it with one color (e.g., blue).
Color all its adjacent vertices with the other color (e.g., red).
Continue this process for all connected components of the graph.
If at any point, you encounter two adjacent vertices with the same color, it is n...read more
Q21. System Design round - Designing solution
Design a scalable and fault-tolerant system for a social media platform
Use microservices architecture to break down the system into smaller, independent services
Implement load balancing to distribute traffic evenly across servers
Utilize caching mechanisms to improve performance and reduce database load
Implement redundancy and failover mechanisms to ensure high availability
Use monitoring and alerting tools to detect and respond to issues proactively
Q22. Josephus Problem Statement
Consider 'N' individuals standing in a circle, numbered consecutively from 1 to N, in a clockwise direction. Initially, the person at position 1 starts counting and will skip K-1 pers...read more
The Josephus Problem involves eliminating every Kth person in a circle of N individuals until only one person remains. Determine the position of the last person standing.
Use a circular linked list to simulate the elimination process efficiently
Implement a function to find the position of the last person standing based on the given N and K values
Consider edge cases such as when N=1 or K=1
Optimize the solution to handle large values of N and K efficiently
Q23. Design calculator app
Design a calculator app with basic arithmetic operations.
Include basic arithmetic operations like addition, subtraction, multiplication, and division.
Design a user-friendly interface with large buttons for numbers and operations.
Allow users to input numbers using both keypad and touch screen.
Implement error handling for division by zero and other invalid inputs.
Q24. design url shortener
Design a URL shortener system
Generate a unique short code for each URL
Store the mapping of short code to original URL in a database
Redirect users from short URL to original URL
Consider scalability and performance
Implement analytics to track usage statistics
Q25. How can improve the sales and marketing what is your projection What is the reporting procedure
To improve sales and marketing, I would focus on creating targeted campaigns and utilizing data analytics to track performance.
Conduct market research to identify target audience and their needs
Develop targeted campaigns with clear messaging and call-to-action
Utilize data analytics to track campaign performance and make adjustments as needed
Collaborate with sales team to ensure alignment and provide necessary support
Regularly review and update marketing strategies based on ma...read more
Q26. Sql queries to find 2 max salary
Use SQL query to find the top 2 highest salaries in a table.
Use the ORDER BY clause to sort the salaries in descending order.
Use the LIMIT clause to limit the results to 2.
Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 2;
Q27. Logical coding to write power base 10
To write power base 10 in logical coding, you can simply use the exponentiation operator or function.
Use the exponentiation operator '**' in Python to calculate power base 10.
In JavaScript, you can use the Math.pow() function to calculate power base 10.
In Java, you can use the Math.pow() function as well to calculate power base 10.
Q28. what do think about women's education?
Women's education is crucial for the development of society and the empowerment of women.
Women's education leads to better health outcomes for themselves and their families.
Educated women are more likely to participate in the workforce and contribute to the economy.
Education can help women gain the skills and knowledge needed to advocate for their rights and challenge gender inequality.
Investing in women's education has been shown to have a positive impact on reducing poverty...read more
Q29. Design a whole application in fiori
Q30. how do you problem solve?
I approach problem solving by breaking down the issue, analyzing possible solutions, and implementing the best course of action.
Identify the problem and gather relevant information
Brainstorm potential solutions
Evaluate each solution based on feasibility and effectiveness
Implement the chosen solution and monitor outcomes
Adjust the approach if needed
Q31. Design Walmart search API
Design Walmart search API
Define search parameters (e.g. product name, category, price range)
Implement search algorithm (e.g. keyword matching, relevance ranking)
Integrate with Walmart's product database
Provide filtering and sorting options
Ensure scalability and performance
Include error handling and logging
Q32. Explain Inheritance in C++
Inheritance in C++ allows a class to inherit properties and behavior from another class.
Inheritance allows for code reusability by creating a new class based on an existing class.
Derived class inherits attributes and methods from the base class.
Types of inheritance include single, multiple, multilevel, and hierarchical.
Example: class Animal is a base class, class Dog is a derived class inheriting from Animal.
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