For a given item X and shopping records array, write code to find out what else (item Y) was bought mostly by the customers who bought item X



We have an array representing customer’s shopping records.
For example, it’s an array like this:


custA, item1,
custB, item1,
custA, item2,
custB, item3,
custC, item1,
custC, item3,
custD, item2,

This array indicates that customer A bought item 1, customer B bought item 1, customer A bought item 2, customer B bought item 3, etc..
For a given item X and shopping records array, write code to find out what else (item Y) was bought mostly by the customers who bought item X.
For example, in above example, if X is item 1 then Y should be item 3.


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In-app purchase fails after telling “item already bought” message
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All the bundle IDs etc. are set up and working, and I can see my product as valid when I fetch the Apple Store servers. However, while testing, I am getting failed transactions at the paymentQueue callback.


Here is what happens in the iOS simulator step by step:


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How to improve compare of item in sorted List<MyItem> with item before and after current item?
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Does anyone know about a good way to accomplish this task?


Currently i'm doing it more ore less this way, but i'm feeling someway unhappy with this code, unable to say what i could immediately improve.


So if anyone has a smarter way of doing this job i would be happy to know.


private bool Check(List<MyItem> list)
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For a given item X and shopping records array, write code to find out what else (item Y) was bought mostly by the customers who bought item X
Development Tools & Services

We have an array representing customer’s shopping records.
For example, it’s an array like this:


custA, item1,
custB, item1,
custA, item2,
custB, item3,
custC, item1,
custC, item3,
custD, item2,

This array indicates that customer A bought item 1, customer B bought item 1, customer A bought item 2, customer B bought item 3, etc..
For a given item X and shopping records array, write code to find out what else (item Y) was bought mostly by the customers who bought item X.
For example, in above example, if X is item 1 then Y should be item 3.


What do I need in a database for “Customers Who Bought This Item Also Bought”?
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Amazon has "Customers Who Bought This Item Also Bought".


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What fields do I need in a database? Any website, blog or resources for this?


Can you suggest the mechanism how to I should code it please?


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