Given a string s, return true if it is a palindrome, or false otherwise. Input:s = “aba” Output:true This problem checks whether a string is a palindrome, meaning it reads the same forward and backward. Typical approach: Runs in O(n) time and O(1) space (two-pointer approach). The VOprep team has long accompanied candidates through various major company…

A unique character is one that appears only once in a string.Given a string consisting of lowercase English letters only, return the index of the first occurrence of a unique character in the string using 1-based indexing.If the string does not contain any unique character, return -1. Example:s = “statistics”The unique characters are [a, c],…

Parentheses strings are strings containing only the characters ‘(‘ and ‘)’.A parentheses string is considered balanced when its opening parentheses align with its closing parentheses.For example, “()” and “(())” are balanced, while “)(“, “())(” are not. Given a string consisting of the same number of opening and closing parentheses, determine the minimum number of character…

You are running a car dealership and currently have 2 employees.We are going to be building a basic function to deal with customers booking appointments with your employees. You have the following constraints: Implement a DealershipScheduler class with the following method: Return true if you can book an appointment for these times, and false if…

You’re building a daily calendar app and need to display all of the day’s events in the right location on the screen, but it needs to be given a bounding box.We need to take a list of events happening that day and produce a list of bounding boxes to be drawn. An event has: Example…

Problem statement（题目原文）Given: What is the result of each of the following statements? Brief idea Know == performs coercion (string → number), === doesn’t; + concatenates when a string is involved; unary + coerces to number. The VOprep team has long accompanied candidates through various major company OAs and VOs, including Microsoft Google, Amazon, Citadel, SIG, providing real-time…

Problem statementImagine you’re working on a language which only supports Stack, but you need a Queue functionality to fulfill the requirement. Design a queue that supports standard operations using stacks. Brief idea (EN)Use two stacks: in and out. The VOprep team has long accompanied candidates through various major company OAs and VOs, including Microsoft Google, Amazon, Citadel,…

Design a simulation for a card game. This game is playable by 2 or more playersand consists of four phases performed in order: shuffle, deal, exchange, and score. Deck of cards: The VOprep team has long accompanied candidates through various major company OAs and VOs, including Microsoft Google, Amazon, Citadel, SIG, providing real-time voice assistance, remote practice,…

Description The 8 Puzzle is a sliding block game played on a 3×3 grid containing 8 numbered tiles (from 1 to 8) and one empty space represented by 0. The objective is to rearrange the tiles into a specific goal configuration by sliding them one at a time.Only tiles adjacent to the empty space (0)…

An integer array “original” is transformed into a doubled array “changed” by appending twice the value of every element in “original”, and then randomly shuffling the resulting array.Given an array “changed”, return “original” if “changed” is a doubled array. If “changed” is not a doubled array, return an empty array. The elements in “original” may…