{"blocks": [{"key": "67d13da7", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "c27ddcef", "text": "Design a scalable leaderboard service that supports: (a) fetching a user’s global rank, (b) fetching the user’s rank within their friendship circle, and (c) returning the k users immediately before and after the user in both scopes.", "type": "unordered-list-item", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "3cea9397", "text": "Design a full-featured messenger application supporting real-time chat, message storage, presence, and scalability.", "type": "unordered-list-item", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}