摘要：Uber总是考一些系统设计的题目，而且重复率很高，汇总了一下地里的所有design的题目，希望可以跟小伙伴们讨论下。Uber Design Questions1. 让design uber app2. 常见题-Design spotify，主要在问playlist和shuffle list功能。... 阅读全文

摘要：http://www.geeksforgeeks.org/print-binary-tree-vertical-order/ 1 package algorithms; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 impor... 阅读全文

摘要：You are playing the followingBulls and Cowsgame with your friend: You write a 4-digit secret number and ask your friend to guess it. Each time your fr... 阅读全文

摘要：Given an integer n, count the total number of digit 1 appearing in all non-negative integers less than or equal to n.For example:Given n = 13,Return 6... 阅读全文