Outscal Interview Questions and Answers

I was given 3 C++ code submission of DSA questions, but it had errors in syntax and logic. My task was to find as many errors as possible in the code and provide correct solution to the question. They asked me to provide video solution.

Q1. Contructors and its types. Types of Copy Constructor
Ans. 
Constructors are special member functions in a class used to initialize objects. Copy constructors create a new object as a copy of an existing object.
• Types of constructors: Default constructor, Parameterized constructor, Copy constructor, and Destructor

• Types of copy constructors: Shallow copy constructor and Deep copy constructor

• Shallow copy constructor copies the values of the members of one object to another object....read more
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Q2. What are Smart Pointers
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Smart pointers are objects that manage the memory of dynamically allocated objects in C++ to prevent memory leaks.
• Smart pointers automatically delete the object they point to when they are no longer needed.

• Examples include unique_ptr, shared_ptr, and weak_ptr in C++.

• They help in preventing memory leaks and dangling pointers.

• Smart pointers provide better memory management compared to raw pointers.
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Q3. What is Diamond Problem in C++ ? How to solve it ?
Ans. 
Diamond Problem occurs in multiple inheritance when a class inherits from two classes that have a common base class.
• Diamond Problem arises when a class inherits from two classes that have a common base class.

• Ambiguity arises in accessing the common base class members.

• To solve Diamond Problem, virtual inheritance is used to ensure only one copy of the common base class is inherited.
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Q4. Virtual Functions and why is it needed ?
Ans. 
Virtual functions in C++ allow for dynamic polymorphism by enabling a function to be overridden in a derived class.
• Virtual functions are used in C++ to achieve runtime polymorphism, where the function to be called is determined at runtime based on the object's type.

• They are needed to enable a base class pointer to call a function that is overridden in a derived class.

• Virtual functions help in achieving the Open/Closed ...read more
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Q5. Middle of a linked list
Ans. 
To find the middle of a linked list, use two pointers - one moving at double the speed of the other.
• Initialize two pointers, slow and fast, both pointing to the head of the linked list.

• Move the slow pointer by one node and the fast pointer by two nodes in each iteration.

• When the fast pointer reaches the end of the list, the slow pointer will be at the middle node.
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Q6. Travelling Salesman Problem
Ans. 
The Travelling Salesman Problem is a classic optimization problem where a salesman needs to visit a set of cities exactly once and return to the starting city with the shortest possible route.
• The goal is to find the shortest possible route that visits each city exactly once and returns to the starting city.

• This problem is NP-hard, meaning there is no known efficient algorithm to solve it for large numbers of cities.

• One...read more
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Q7. Abstract Classes and Interface
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Q1. React machine coding + DSA questions easy to medium level
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Selenium, java, Manual Testing

Q1. Manual Testing, Java ,Selenium
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