The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens

Given a set of distinct integers, nums, return all possible subsets. Note: The solution set must not contain duplicate subsets. For example, If nums = [1,2,...

You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb

Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. For example, Given 1->2->3->3...

Given an array of integers, find out whether there are two distinct indices i and j in the array such that the absolute difference between nums[i] and nums[j]...

Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the absolut...

Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and i...

Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. For example, Gi...

Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. For example, Given nums = [0, 1, 3] re...

【原题】 Given a set of distinct integers, nums, return all possible subsets.Note: The solution set