#408Medium#35 in X (Twitter)'s list· asked at 8 companies
Design Twitter
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What we know
Example 1
Input: ["Twitter","postTweet","getNewsFeed","follow","postTweet","getNewsFeed","unfollow","getNewsFeed"] [[],[1,5],[1],[1,2],[2,6],[1],[1,2],[1]] Output: [null,null,[5],null,null,[6,5],null,[5]]
Constraints
- •
1 <= userId, followerId, followeeId <= 500 - •
0 <= tweetId <= 10^4 - •
All tweets have unique IDs.
- •
At most
3 * 10^4calls will be made.