Java Generics: An Introductory Guide
Generics enable types (classes and interfaces) to be parameters when defining classes, interfaces, and methods.
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Unique Number of Occurrences: Coding Interview Problem
Problem Statement Given an array of integers arr, write a function that returns true if the number of occurrences of each value in the array is unique, otherwise return false. Example For the array arr = [1,2,2,1,1,3], the number of occurrences are: 1 appears 3 times, 2 appears 2 times, and 3 appears 1 time.
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Python Idioms – Write Readable and Efficient Code
Programming idioms are specific to each language. These idiomatic patterns are considered the “Pythonic” way to write code in Python. Knowing them helps you write more readable and efficient code. Let’s dive into some of the most common and useful Python idioms. 1. List Comprehensions Instead of using a loop to generate lists, use a
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Reading and Writing Files in Java: A Comprehensive Guide
File I/O (Input/Output) is one of the fundamental tasks in programming. Java, with its rich libraries, provides multiple ways to read from and write to files. Each method has its own advantages, suitable for different use cases. Let’s delve into the most common methods Java offers for file manipulation. 1. Using FileInputStream and FileOutputStream Reading
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Solving “Two Sum” Coding Interview Problem Efficiently
Problem Statement: Given an array of integers, nums, and an integer target, return the indices of the two numbers such that they add up to the target. You may assume that each input would have exactly one solution, and you may not use the same element twice. Example For the array nums = [2, 7,
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Comparable vs Comparator Interface: A Deep Dive
Introduction In Java, sorting objects can be challenging, especially when they’re custom objects. That’s where the Comparable interface and Comparator interface come into play. These are two essential tools in a Java developer’s toolbox. In this post, we’ll explore both in detail, explaining their differences, benefits, and use cases. The Comparable Interface When you want
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How to check if two Strings are Anagram of each other?
Problem Statement Given two strings, s and t, determine if t is an anagram of s. Definition of Anagram An anagram is a word or phrase formed by rearranging the letters of another word or phrase, using all the original letters exactly once. Example For the strings s = “anagram” and t = “ganaram”, the
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Using Java’s Priority Queue as Min-Heap and Max-Heap
Introduction The Java util package provides a versatile data structure known as the PriorityQueue. This is essentially an implementation of a priority queue using a binary heap. By default, it works as a min-heap, but by passing a custom comparator, it can function as a max-heap. In this guide, we’ll explore the nuances of using
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Solving “Container With Most Water” Coding Interview Problem
Problem Statement Given an array of integers, where each integer represents the height of a vertical line on a chart, determine the two lines which, together with the x-axis, forms a container that can hold the most water. The objective is to maximize the area of the container. Note: The width of the container is
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Implement Your Own “String to Integer” Conversion Method
Problem Statement The challenge is to implement your own method for converting a string to an integer without using any built-in methods. This is a very common question in coding interviews. The string may represent a positive or negative integer, and you should be able to handle both. For example: Note: You can assume that
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