Amazon Interview Question SDE-2s
Team: android amazon app, social shopping
Country: United States
Interview Type: In-Person
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so this is somewhat like desinging a recommendation engine.
- ashish June 30, 2016Here is my approach
lets there are three users
User A : Product bought A,B,C
User B: Product bought B,F
User C : product bought D,A,C
now when User D buys product C , we need to recommend him A,D,B.
approach
create a undirected graph with adjacency linked list approach and a hashmap which gives us node reference present in graph
now for user A : graph will have node A as one node and Node B and Node C will be neighbour node
For Node B , Node A and Node C are his neibhours,
For Node C , Node B and Node A are his neighbours,
Also keep on inserting these node addresses in hashmap as well.
keep on repeating these steps on each user,
now for User D we need to traverse Node C in BFS manner at one level and give him the output.
We can modify above approach by maintaing count of products bought for better approach