(This question has been seen in the interviews of the following companies: )
[Priority Expiration Cache]
Design a cache with the following methods:
get (String key)
set (String key, String value, int priority, int expiry)
evictItem(int currentTime)
The rules by which the cache operates are as follows:
If an expired item is available. Remove it. If multiple items have the
same expiry, removing any one suffices.
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