stripe 店面

好像是新题。
有User，每个user有id(int), name, location. 有list of feature. 每个feature 有 id(string), list of location, abTest(boolean). give a user, find list of features that can apply to the user. if it meets the fo

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amework啊，提前define的class都没有，然后问他问题，他就说， whatever the quicktest way you can finish the code. 所以他家就是想找写code最快的吗

https://leetcode.com/discuss/interview-question/1917297/Stripe-or-Bay-Area-or-Backend-Engineer

1. Consider a system of User and Feature objects, where a Feature describes the availability of
   
2. an ongoing project or change in functionality. Features may be generally available, limited to
   
3. certain regions, and/or intended for an A/B test. We need to write a deterministic system for
   
4. identifying which Features are active for a given User. We also want to write tests to ensure
   
5. that our system is working as intended each time we run it, given the example User and Feature
   
6. data below.
   
7. 
   
8. Users:
   
9. 
   
10.         [
    
11. { "id": 0, "name": "eva",    "location": "US" },
    
12. { "id": 1, "name": "tess",   "location": "US" },
    
13. { "id": 2, "name": "rahool", "location": "CA" },
    
14. { "id": 3, "name": "amanda", "location": "CA" }
    
15.     ]
    
16. 
    
17. Features:
    
18. 
    
19.         [
    
20. {
    
21.     "id": "annual_sale",
    
22.         "locations": ["US"],
    
23.     "abTest": true,
    
24. },
    
25. {
    
26.     "id": "enhanced_comments",
    
27.         "abTest": true,
    
28. },
    
29. {
    
30.     "id": "canada_promotion",
    
31.         "locations": ["CA"],
    
32. }
    
33.     ]
    
34. 
    
35.             ## Part 1
    
36. 
    
37. Write a function, `get_user_features(user, features)` which takes a single User object and a list
    
38. of Feature objects and returns a set of the Feature IDs that apply to the given User.
    
39. 
    
40. A User has three properties: an integer `id`, a string `name`, and a 2-letter country code
    
41. string `location`.
    
42. 
    
43. A Feature has three properties: a unique string `id`, an optional array of 2-letter country code
    
44. strings, `locations`, which limits the feature to users with a matching location, and an optional
    
45. boolean, `abTest`, which when set to true will only apply the feature to users with an even user ID.
    
46. 
    
47. If `abTest` or `locations` are absent for a Feature, they have no effect.
    
48. 
    
49. Given the features and users, the following results are expected:
    
50. 
    
51.         | User   | Features                            |
    
52.         | ------ | ----------------------------------- |
    
53.         | eva    | annual_sale, enhanced_comments      |
    
54.         | tess   | N/A                                 |
    
55.         | rahool | enhanced_comments, canada_promotion |
    
56.         | amanda | canada_promotion                    |
    
57. 
    
58. 
    
59. 
    
60. 
    
61.         ## Part 2
    
62. 
    
63. Users may want to opt-in to or opt-out of a feature. Augment `get_user_features` to take into
    
64. account two new properties on `User` objects: `optIn` and `optOut`, both of which are arrays of
    
65. feature IDs to either opt into or opt out of. A user can be opted-in to an A/B test Feature,
    
66. regardless of their ID. A user cannot be given a feature that is not available in their region,
    
67. even if they try to opt-in to it.
    
68. 
    
69.         Users 0 (eva),  1 (tess) and 3 (amanda) would like to opt in to the `annual_sale` feature.
    
70. 
    
71.         User 2, (rahool), would like to opt out of the `enhanced_comments` and `canada_promotion` features.
    
72. 
    
73.         Our new user data is...
    
74. 
    
75. Users:
    
76. { "id": 0, "name": "eva",    "location": "US", "optIn": ["annual_sale"] }
    
77. { "id": 1, "name": "tess",   "location": "US", "optIn": ["annual_sale"] }
    
78. { "id": 2, "name": "rahool", "location": "CA", "optOut": ["enhanced_comments", "canada_promotion"] }
    
79. { "id": 3, "name": "amanda", "location": "CA", "optIn": ["annual_sale"] }
    
80. 
    
81. Given these changes and updates, the following results are now expected:
    
82. 
    
83.         | User   | Features                       |
    
84.         | ------ | ------------------------------ |
    
85.         | eva    | annual_sale, enhanced_comments |
    
86.         | tess   | annual_sale                    |
    
87.         | rahool | N/A                            |
    
88.         | amanda | canada_promotion               |

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第二个part没有看懂啊 能再稍微解释一下么？ 非常感谢

他家就是必须全部都过了才pass 不然就挂你。。。

有人知道第3部分吗？