Classes and Objects
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Code Problem / Data Structures and Algorithms / Recursion (32)
Code Problem / Data Structures and Algorithms / Binary Search (30)
Code Problem / Data Structures and Algorithms / Linked Lists (26)
Code Problem / Data Structures and Algorithms / Backtracking (26)
Code Problem / Data Structures and Algorithms / Stacks and Queues (25)
Code Problem / Data Structures and Algorithms / Hashing (24)
Databases / SQL / Backup and Recovery (19)
Code Problem / Data Structures and Algorithms / Arrays and Strings (19)
Databases / SQL / Database Normalization (18)
Code Problem / Data Structures and Algorithms / Time Complexity (17)
Databases / SQL / Locking (16)
Databases / SQL / Replication (15)
Databases / SQL / SQL Queries (13)
Code Problem / Data Structures and Algorithms / Graphs (13)
Databases / SQL / Database Security (13)
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Check these solutions from our community:
This Python class implements a stack using a list. The stack supports the following operations: push, pop, size, and isEmpty.
About this solution: This solution is complete and solves the problem. The approach is straightforward and easy to understand.
This technical problem asks the reader to write a Python class that implements a stack using a linked list. The stack should have methods for pushing an integer onto the stack, popping and returning the top element of the stack, and checking if the stack is empty.
About this solution: The candidate's solution correctly implements a stack using a linked list. The push and pop methods work as expected. The is_empty method also works as expected.
This technical problem deals with creating a Python class named "Foo" with an instance variable named "value". The class also has two methods, "double" and "triple", which multiply the value by 2 and 3, respectively.
About this solution: The candidate's solution correctly implements the required functionality. However, the code could be more concise. For example, the double and triple methods could be combined into a single method that takes a multiplier parameter. Additionally, the methods could return the new value instead of modifying the instance variable directly.
This technical problem explains how to create a calculator class in Python that can perform addition, subtraction, multiplication, and division operations. The calculator takes two operands (numbers) and an operator as input, and returns the result of the operation.
About this solution: The candidate's solution is complete and solves the problem. The approach is straightforward and easy to understand.
This technical problem deals with implementing a stack data structure in Python using a class. The class should have two methods: push, which adds an item to the top of the stack, and pop , which removes and returns the top item from the stack. If the stack is empty, pop should raise an IndexError.
About this solution: The candidate's solution is optimal because it uses the built-in list data structure to store the items in the stack. The list is a dynamic array, which means that it can grow and shrink in size as needed. The push method is O(1) because it simply appends the item to the end of the list. The pop method is O(1) because it simply removes the last item from the list.