Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n ...

A peak element is an element that is greater than its neighbors. Given an input array where num[i] ≠ num[i+1], find a peak el...

Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one dupl...

Given an array of n integers where n > 1, nums, return an array output such that output[i] is equal to the product of all ...

You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Note:You have to rotate t...

Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set). Note: The so...

Given a sorted integer array without duplicates, return the summary of its ranges. Example 1: 123Input: [0,1,2,4,5,7]Output: ...

Find all possible combinations of *k* numbers that add up to a number *n*, given that only numbers from 1 to 9 can be used an...

Given an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarray of which the...

Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might bec...