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Wells Fargo
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I applied via Referral and was interviewed in May 2021. There were 4 interview rounds.
Design a system similar to YouTube for video sharing and streaming
Implement user authentication and authorization for uploading and viewing videos
Create a database to store video metadata, user information, and comments
Develop a recommendation algorithm based on user preferences and viewing history
Utilize a content delivery network (CDN) for efficient video streaming
Include features like video monetization, live stream
I applied via Referral and was interviewed before Sep 2019. There were 3 interview rounds.
I approach dynamic objects by analyzing their behavior and adapting my approach accordingly.
I start by understanding the nature of the dynamic object and its expected behavior
I then analyze its movement patterns and any potential obstacles or hazards
Based on this analysis, I adapt my approach to ensure safe and efficient interaction with the dynamic object
For example, when working with a moving conveyor belt, I would e...
Implicit and explicit wait are two types of wait in Selenium used to synchronize the test execution with the application.
Implicit wait is used to set a default waiting time for the web elements to load before throwing an exception.
Explicit wait is used to wait for a specific condition to occur before proceeding with the test execution.
Implicit wait is set globally for the entire test script while explicit wait is set f...
Java 8 introduced several new features including lambda expressions, streams, and default methods.
Lambda expressions allow for functional programming and concise code.
Streams provide a way to process collections of data in a parallel and functional manner.
Default methods allow for adding new functionality to interfaces without breaking existing implementations.
Method references provide a way to refer to methods without...
Customised immutable java class can be written by declaring all fields as final and not providing any setters.
Declare all fields as final
Do not provide any setters
Provide a constructor to initialize all fields
Override equals() and hashCode() methods
Make the class final
Find an odd occurring number among even occurring numbers.
Use XOR operation to cancel out even occurring numbers and get the odd occurring number.
Iterate through the array and XOR each element with the result variable.
The final result will be the odd occurring number.
Print the spiral order of a binary tree and matrix.
For binary tree, use level order traversal and alternate direction for each level.
For matrix, use four pointers to traverse in spiral order.
Example for binary tree: 1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7 -> 8 -> 9
Example for matrix: 1 2 3 4 -> 8 7 6 5 -> 9 10 11 12 -> 16 15 14 13
Finding pairs in an array with a given sum.
Iterate through the array and for each element, check if the difference between the given sum and the element exists in the array.
Use a hash table to store the elements of the array and their indices for faster lookup.
If there are multiple pairs with the same sum, return any one of them.
If no pair is found, return null or an empty array.
Find total number of k element with given avg in an array in minimum time complexity.
Use sliding window technique to traverse the array in O(n) time complexity.
Maintain a sum variable to keep track of the sum of elements in the window.
If the sum of elements in the window is equal to k times the given avg, increment the count.
Move the window by subtracting the first element and adding the next element in the array.
Printing non-boundary elements of a binary tree
Traverse the tree in any order (preorder, inorder, postorder)
Check if the current node is not a boundary node (not the first or last node in its level)
If it is not a boundary node, print its value
Recursively traverse its left and right subtrees
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