摘要： 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 阅读全文

摘要： 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 a 阅读全文

摘要： 1. Two Sum Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input wo 阅读全文

摘要： 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 arr 阅读全文

摘要： 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 and each combination should be 阅读全文

摘要： 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 exam 阅读全文

摘要： Given a string S, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can f 阅读全文

摘要： Note: This is an extension of House Robber. After robbing those houses on that street, the thief has found himself a new place for his thievery so tha 阅读全文

摘要： Given a 2D board and a list of words from the dictionary, find all words in the board. Each word must be constructed from letters of sequentially adja 阅读全文

摘要： Design a data structure that supports the following two operations: search(word) can search a literal word or a regular expression string containing o 阅读全文