DRW 27 NG QR NYC/Chicago

网上海投了DRW美国的NG QR岗。投递后不到一周收到网测邀请，邮件里写了七天之后网测链接失效，且并无其他ddl通知。然而五天之后收到邮件，说没有及时完成网测，直接脆拒。不过网测的链接仍然有效，所以我仍然在失效之前做完了。

鉴于公司不讲信用，我把记下来的原题贴出来给大家参考。DRW的网测是一批一批发的，每一批的题都不一样，所以估计大家不会遇到这批原题了。但是作为参考还是不错的！

平心而论有些题目并不简单，需要有比较好的基础概率统计和随机过程知识储备。lz准备不充分，答得不好。

Q1.
16 teams of distinct skill levels are randomly assigned to a fixed single-elimination bracket. The tournament has 4 rounds: 16 teams compete in 8 games, the 8 winners advance to 4 quarterfinals, the 4 remaining teams advance to 2 semifinals, and the 2 semif

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Curated Interview Questions from Top Companies

6.
2 lines initially contain 6 and 7 shopping carts. In each round, a line is selected uniformly at random, and 1 cart is removed and returned to a line selected independently and uniformly at random. The cart may therefore be returned to its original line. The process ends when either line is empty at the end of a round. What is the expected number of rounds?

求米求米求米感谢！