ShawnChang

摘要： A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between positive and negative. The 阅读全文

摘要： You are given two integer arrays nums1 and nums2 sorted in ascending order and an integer k. 给你两个数组nums1和nums2,这两个数组都是递增排列的，还给你一个整数k。 Define a pair (u 阅读全文

摘要： Given n, how many structurally unique BST's (binary search trees) that store values 1...n? 给出整数n，有多少中不同的存储着1到n的二叉搜索树。 For example, Given n = 3, there 阅读全文

摘要： Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. 给出一个数组包含n个不同的从0到n取出的数,从中找出一个丢失的的 阅读全文

摘要： We are playing the Guess Game. The game is as follows: 我们来玩一个游戏，规则如下： I pick a number from 1 to n. You have to guess which number I picked. 我从1到n之间选择一 阅读全文

摘要： Given a non-empty array of integers, return the k most frequent elements. 给出一个不为空的整数数组，返回出现频率前k位的数字。 For example, Given [1,1,1,2,2,3] and k = 2, retur 阅读全文

摘要： Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. 给出一个非负整数n，计算出所有没有重复数字的x，其中0≤x<10n。 Example: Given n = 2, r 阅读全文

摘要： Say you have an array for which the ith element is the price of a given stock on day i. 现在有个数组表示股票每天的价格，其中第i个位置表示的是第i天股票的价格。 Design an algorithm to fi 阅读全文

摘要： 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 the elements of nums except 阅读全文

摘要： Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. 不使用‘+’和‘-’，计算两个整数的和。 Example: Given a = 1 and b = 2, r 阅读全文