Amazon Interview Question for 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.
Here 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.

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

- ashish June 30, 2016 | Flag Reply

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