摘要：Design a hit counter which counts the number of hits received in the past 5 minutes. Each function accepts a timestamp parameter (in seconds granularity) and you may assume that calls are being made ... 阅读全文

摘要：Design a Snake game that is played on a device with screen size = width x height. Play the game online if you are not familiar with the game. The snake is initially positioned at the top left corner ... 阅读全文

摘要：Design a Tic-tac-toe game that is played between two players on a n x n grid. You may assume the following rules: 1. A move is guaranteed to be valid and is placed on an empty block. 2. Once a winnin... 阅读全文

摘要：Design an in-memory file system to simulate the following functions: ls: Given a path in string format. If it is a file path, return a list that only 阅读全文