You are given an integer array coins representing coin denominations, and an integer amount representing a total amount of money. Return the fewest number of coins needed to make up the given amount.If it is not possible, return -1. You may use unlimited coins of each denomination. Example 1 Example 2 Use DP:dp[x] = min(dp[x],…

You are given an array of integers representing the amount of money stored in each house.The houses are arranged in a line, and you cannot rob two adjacent houses. Return the maximum amount of money you can rob without ever robbing two adjacent houses. Example (Explanation: choose non-adjacent houses so the sum is maximized.) Use…

Amazon has web server logs from multiple hosts.Each log entry consists of: Example (conceptual): We want to find the 3-page pattern that is visited most frequently across all sessions. In the example, the sequence <cart, checkout, help> appears twice, so it is the most frequent 3-page pattern. Given logs in the form: Return the 3-page…

Convert a number to an Excel column, and convert an Excel column back to a number. In Excel, columns are labeled as: You are asked to implement two functions: You may assume: The VOprep team has long accompanied candidates through various major company OAs and VOs, including Google, Amazon, Citadel, SIG, providing real-time voice assistance, remote practice,…

Implement the Linux find command as an API. Your API should support searching for files that match: Assume the filesystem is represented as a tree-like structure of directories and files. Your job:Design and implement a find-like API that searches the file system and returns all files that satisfy the given filters. Do a DFS traversal…

You are given a (potentially large) list of words.Some words are compound words, meaning they are composed of two or more words that also exist in the same list. Example word list:[rockstar, rock, star, rocks, tar, stars, rockstars, super, highway, high, way, superhighway] Goal:Identify all combinations where a word can be decomposed into two or…

Given an array of integers, find the index of a local minimum. A local minimum is defined as an element that is strictly smaller than its neighbors.Formally: You may assume: Goal:Return the index of one such local minimum. Example: You must return the index of any element that is strictly smaller than both neighbors.Since adjacent…

Implement the function pow(x, n), which calculates x^n.Note that you cannot use any built-in functions that directly implement pow. Examples: Key Ideas: This approach tests understanding of recursion, divide and conquer, and edge case handling (e.g. negative powers, floating-point base). The VOprep team has long accompanied candidates through various major company OAs and VOs, including SnowFlake, Google,…

Level 1 The basic level of the in-memory database contains records. Each record can be accessed with a unique identifier key of string type. A record may contain several field – value pairs, both of which are of string type. Function Definitions Examples Queries Explanations set(“A”, “B”, “E”) database state: {“A”: {“B”:“E”}} set(“A”, “C”, “F”) database state: {“A”: {“C”:“F”,“B”:“E”}}…

Your team is debugging a program’s performance. A tracing tool records all function calls and returns, producing a sequence of events.Your task is to analyze these raw traces and determine which call stack occurs most frequently.Finding the most frequent call stack will help identify where the main slowdown may be occurring. Input Output Call Stack…