Wells Fargo Interview Questions, Process, and Tips for Experienced

Q1. Balance sheet, Trail Balance
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Q1. Trail Balance, Accounting
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Round duration - 90 minutes
Round difficulty - Medium

There were 3 sections: Verbal Section, Business Aptitude, and Coding.

Round duration - 50 minutes
Round difficulty - Medium

It was a technical interview round where I was asked questions from my resume and questions based on DSA, OS, and DBMS.
The first interviewer asked me the following questions:

1. Detect the loop in the linked list and find the starting point of the loop. 
2. The question was like this: Given an array of strings, find the first unique string in the array. For example, the given array is {“apple”, “mango”, “pear”, “apple”, “orange”, “pear”}. Here, both “mango” and “orange” are occurring once, but the answer is “mango” since it occurs before “orange” in the array.

Then the second interviewer started asking the following questions:

1. He gave me the inorder and preorder traversals of a binary tree and asked me to find its postorder traversal. He was only interested in the final answer.
2. What is a stack? What are some practical applications of stack? What operations can we perform on stack?
3. Name the sorting algorithms based on Divide and Conquer.
4. What is Selection Sort? What is its time complexity?
5. What are the differences between Array and Linked List? When will you use each of them?
6. What is a Minimum Spanning Tree? What are the algorithms to find MST?
7. Since my projects were based on Web Development, he asked different HTTP methods and what is the difference between authentication and authorization?
8. Write a SQL query to display the top 5 people with the maximum salary from an Employee table.
9. How is memory allocated in C and C++?
10. What is deadlock?
11. What are the differences between Process and Thread?
12. What are the differences between RAM and ROM?
13. A puzzle
At last, the interviewer asked if I had any questions for him.

Q1. 
Detect the First Node of the Loop in a Singly Linked List
You are provided with a singly linked list that may contain a cycle. Your task is to return the node where the cycle begins, if such a cycle exist...read more
Ans. 
To detect the first node of a cycle in a singly linked list, we can use the Floyd's Tortoise and Hare algorithm.
• Use two pointers, slow and fast, to traverse the linked list.

• If there is a cycle, the fast pointer will eventually catch up to the slow pointer.

• Move the fast pointer twice as fast as the slow pointer.

• Once the pointers meet, reset the slow pointer to the head of the linked list.

• Move both pointers at the same s...read more
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Q2. Three friends have the option to either bike or walk to their destination. What factors should they consider when deciding which mode of transport to use?
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Round duration - 10 minutes
Round difficulty - Easy

Q1. Explain Solid Principle
Ans. 
SOLID is a set of principles for object-oriented programming to make software more maintainable, scalable and robust.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open-Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Subtypes must be substitutable for their base types.

• I - Interface Segregation Princip...read more
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Q2. Description of Liskove Principle
Ans. 
Liskov Substitution Principle (LSP) states that objects of a superclass should be able to be replaced with objects of its subclasses without affecting the correctness of the program.
• LSP is one of the SOLID principles of object-oriented programming.

• It ensures that the behavior of the program remains consistent when a subclass is used in place of a superclass.

• Violating LSP can lead to unexpected behavior and bugs in the ...read more
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Q3. Query for delete duplicate rows
Ans. 
Query to delete duplicate rows in a table
• Use the DISTINCT keyword to select unique rows

• Use the GROUP BY clause to group the rows by columns

• Use the HAVING clause to filter out the duplicate rows

• Use the DELETE statement to delete the duplicate rows
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Q1. Database Connection pooling
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Q2. Link list implementation
Ans. 
Link list implementation
• A linked list is a data structure where each element points to the next one

• It consists of nodes that contain data and a pointer to the next node

• Insertion and deletion are efficient, but random access is not

• Examples include singly linked list, doubly linked list, and circular linked list
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Q3. Type of sql injections using plain text query
Ans. 
SQL injections using plain text query can be of various types.
• Union-based SQL injection

• Error-based SQL injection

• Boolean-based SQL injection

• Time-based SQL injection

• Out-of-band SQL injection
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Q1. Asked in-depth of Linux Commands
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Q1. Asked about all Application Issues
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Q1. Asked About Current and Expected CTC
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