You are given a 0-indexed array ’nums’ where each element represents the maximum length you can jump forward from that index. You are initially positioned at nums[0], and you need to reach the last index. Return the minimum number of jumps needed to reach the last index.
Given an n x n 2D matrix representing an image, rotate the image by 90 degrees clockwise. The rotation should be done in-place, meaning you cannot allocate another 2D matrix.
You are given an array of strings. Group the strings that are anagrams of each other together and return them as a list of lists. An anagram is a word or phrase formed by rearranging the letters of another word or phrase.
You are given a number x and an integer n. Your task is to compute x raised to the power n (i.e., x^n). Handle cases where the exponent is negative by returning the reciprocal of the result.
