Yodlee Software Engineer Interview Questions, Process, and Tips

Hackerrank algorithms and ds test

Q1. Technical on java and aws
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Logical Reasoning, Questions on distances, Questions on directions

1- Difference between array list and linked list.
2- Reverse the linked list

1-Difference between Arraylist and Linked list.
2-Check if strings are anagram.

Round duration - 90 minutes
Round difficulty - Easy

It was on online objective test consisting of 4 sections: Aptitude, Technical MCQs, Code snippet based MCQs and Coding part.

Q1. Valid Parentheses
You're given string ‘STR’ consisting solely of “{“, “}”, “(“, “)”, “[“ and “]” . Determine whether the parentheses are balanced.
Input Format:
The first line contains an Integer &...read more
Ans. 
A stack can be used to solve this question. 
We traverse the given string s and if we:
1. see open bracket we put it to stack
2. see closed bracket, then it must be equal to bracket in the top of our stack, so we check it and if it is true, we remove this pair of brackets.
3. In the end, if and only if we have empty stack, we have valid string.
Complexity: time complexity is O(n): we put and pop each element of string ...read more
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Q2. Check if a linked list is palindrome
You are given a singly Linked List of integers. Your task is to return true if the given singly linked list is a palindrome otherwise returns false.
For example:
The ...read more
Ans. 
A simple approach could be to use a stack. Traverse the given list and push all the nodes to a stack. Now, Traverse the list again. For every visited node, pop the topmost node from the stack and compare data of popped node with the currently visited node. If all nodes match, then the linked list is a palindrome. 
Time Complexity : O(N) 
Auxiliary Space : O(N)

A better approach would be to reverse the second hal...read more
Answered by CodingNinjas
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Round duration - 60 minutes
Round difficulty - Easy

This was a technical and managerial round. The interviewer gave me a situation where I am in testing team and I found that customer requirement was drop down list at a place but developer has used bullet selection, and is not ready to change it. How will you manage? I gave some good replies and he was convinced.

Q1. Puzzle
There are 25 horses among which you need to find out the fastest 3 horses. You can conduct race among at most 5 to find out their relative speed. At no point you can find out the actual speed of the ...read more
Ans. 
Make group of 5 horses and run 5 races. Suppose five groups are a,b,c,d,e and next alphabet is its individual rank in tis group(of 5 horses).for eg. d3 means horse in group d and has rank 3rd in his group. [ 5 RACES DONE ] 
a1 b1 c1 d1 e1 
a2 b2 c2 d2 e2 
a3 b3 c3 d3 e3 
a4 b4 c4 d4 e4 
a5 b5 c5 d5 e5 

Now make a race of (a1,b1,c1,d1,e1).[RACE 6 DONE] suppose result is a1>b1>c1>d1>e1...read more
Answered by CodingNinjas
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Q2. OOPS Question
What is a virtual function?
Ans. 
A C++ virtual function is a member function in the base class that you redefine in a derived class. It is declared using the virtual keyword. It is used to tell the compiler to perform dynamic linkage or late binding on the function. A 'virtual' is a keyword preceding the normal declaration of a function. When the function is made virtual, C++ determines which function is to be invoked at the runtime based on the type
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Q3. Level order traversal in spiral form
Level order traversal in spiral form
Ans. 
To print the nodes in spiral order, nodes at different levels should be printed in alternating order. An additional Boolean variable ltr is used to change printing order of levels. If ltr is 1 then printGivenLevel() prints nodes from left to right else from right to left. Value of ltr is flipped in each iteration to change the order.
 
Function to print level order traversal of tree : 
 
printSpiral(tree)
	...read more
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Q4. OOPS Question
What are abstract classes in C++?
Ans. 
An abstract class in C++ is a class that has at least one pure virtual function (i.e., a function that has no definition). The classes inheriting the abstract class must provide a definition for the pure virtual function; otherwise, the subclass would become an abstract class itself. Abstract classes are essential to providing an abstraction to the code to make it reusable and extendable.
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Round duration - 60 minutes
Round difficulty - Easy

This was also a technical round. He asked to optimize the code I wrote in coding round. Then he asked me a few puzzles and questions on OOPS, OS and DBMS.

Q1. Puzzle
Given two candles. Each of them burns for one hour. They burn unevenly in different parts though. In addition, let’s have a box of matches. Measure 45 minutes and 15 minutes.
Ans. 
Step1: Both ends of the first candle should be lit, but only one end of the second candle should be lit. After the first candle has burned fully in 30 minutes, the remaining time is 30 minutes to burn the other candle with one end unburned.

Step2: Now lit both the ends of the 30-min(remaining) length of candle 2, it will burn in 15 minutes. Now let’s have a look at the solution candle-wise.
Candle1: The first candle is l...read more
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Q2. DBMS Question
Explain the ACID properties.
Ans. 
Atomicity :
By this, we mean that either the entire transaction takes place at once or doesn’t happen at all. There is no midway i.e. transactions do not occur partially. Each transaction is considered as one unit and either runs to completion or is not executed at all. It involves the following two operations. 
—Abort: If a transaction aborts, changes made to database are not visible. 
—Commit: If a transaction...read more
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Q3. Operating System Question
What is Paging and Segmentation?
Ans. 
Paging is a method or techniques which is used for non-contiguous memory allocation. It is a fixed size partitioning theme (scheme). In paging, both main memory and secondary memory are divided into equal fixed size partitions. The partitions of secondary memory area unit and main memory area unit known as as pages and frames respectively.

Segmentation is another non-contiguous memory allocation scheme like paging. like...read more
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Q4. DBMS Question
What is concurrency control?
Ans. 
Concurrency Control: The process of managing the simultaneous execution of transactions in a shared database, is known as concurrency control. Basically, concurrency control ensures that correct results for concurrent operations are generated, while getting those results as quickly as possible.
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Q5. Java Question
Difference between String Buffer and String Builder
Ans. 
1. StringBuffer is synchronized i.e. thread safe. It means two threads can't call the methods of StringBuffer simultaneously. StringBuilder is non-synchronized i.e. not thread safe. It means two threads can call the methods of StringBuilder simultaneously.

2) StringBuffer is less efficient than StringBuilder. StringBuilder is more efficient than StringBuffer.
 
3) StringBuffer was introduced in Java 1.0. StringBuilde
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Q6. C++ Question
What are smart pointers?
Ans. 
A Smart Pointer is a wrapper class over a pointer with an operator like * and -> overloaded. The objects of the smart pointer class look like normal pointers. But, unlike Normal Pointers it can deallocate and free destroyed object memory. The idea is to take a class with a pointer, destructor and overloaded operators like * and ->. Since the destructor is automatically called when an object goes out of scope, the...read more
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Q7. Puzzle
A shop sells chocolates @ Re.1 each. You can exchange 3 wrappers for 1 chocolate. If you have Rs.15/- how many chocolates can you get totally?
Ans. 
For 15 rupees you get 15 chocolates.
On returning 15 wrappers you get 5 chocolates.
On returning 3 wrappers (keeping two wrappers in hand) you get 1 chocolate.
Now this one chocolate. wrapper and the twp wrapers you had will add on three.
Atlast on returning 3 wrappers you get 1 chocolate.
i.e., 15+5+1+1 = 22 chocolates.
Answered by CodingNinjas
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Q8. Operating System Question
Difference between Mutex and Semaphore
Ans. 
1. Mutex uses a locking mechanism i.e. if a process wants to use a resource then it locks the resource, uses it and then release it. But on the other hand, semaphore uses a signalling mechanism where wait() and signal() methods are used to show if a process is releasing a resource or taking a resource.

2. A mutex is an object but semaphore is an integer variable.
 
3. In semaphore, we have wait() and signal() functio...read more
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