第一题:
Question
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&nb