Design a spellchecker that corrects a given word from a query based on specific rules. For each query, find a matching word from the given wordlist by applying exact matches, case-insensitive matches, or vowel error corrections. Return the corrected word, or an empty string if no match is found.
You are tasked with sorting an array of integers by performing a series of pancake flips. A pancake flip involves reversing the order of elements from the start of the array up to a specified index. The goal is to determine the sequence of flips needed to sort the array in ascending order.
Given an array of points on a 2D plane, find the k closest points to the origin (0, 0) based on Euclidean distance. If multiple points have the same distance, any order is acceptable.
Given an integer array nums and an integer k, return the number of non-empty subarrays where the sum of elements is divisible by k. A subarray is defined as a contiguous sequence of elements in the array.
Given an integer array arr, return the length of the largest subarray that is turbulent. A subarray is considered turbulent if the comparison sign alternates between each adjacent pair of elements.