Tag: java
In OOP (Object Oriented Programming), we use inheritance to achieve the polymorphism. The factory design pattern allows you to create/manage different types of classes in a single place. Let’s …
Given the root of a binary tree, consider all root to leaf paths: paths from the root to any leaf. (A leaf is a node with no children.) A …
Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Input: 121 Output: true Example 2: Input: …
Given two integers representing the numerator and denominator of a fraction, return the fraction in string format. If the fractional part is repeating, enclose the repeating part in parentheses. …
Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it …
