5 Mini FlickrHardness: 第四期完成率: 1/1.Enter 6 AppStore with JAVAHardness: 第四期完成率: 2/3.Enter 9 Web CrawlerHardness: 第四期完成率: 2/4.Enter 12 Open Source Search EngineHardness: 0Enter 13 App Store with MeteorJSHardness: 第四期完成率: 2/4.Enter 16 Ads Searching SystemHardness: 第四期完成率: 1/2.Enter 17 Movie Rating with Collaborative FilteringHardness: 第四期完成率: 2/3.Enter