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How do I implement the Least Frequently Used (LFU) caching algorithm?

An example of an AI chatbot conversation about implementing the LFU caching algorithm.

😀
You

How do I implement the Least Frequently Used (LFU) caching algorithm?

MagicBuddy
MagicBuddy

To implement LFU, you need to maintain a frequency count for each item in the cache. When an item is accessed, increment its count.

😀
You

What data structure should I use to keep track of the frequency counts?

MagicBuddy
MagicBuddy

A combination of a hash map and a min-heap is often used. The hash map stores the items and their frequencies, while the min-heap helps efficiently find the least frequently used item.

😀
You

How do I handle ties when two items have the same frequency?

MagicBuddy
MagicBuddy

In case of a tie, you can use a secondary criterion, such as the time of last access, to decide which item to evict.

😀
You

Can you provide a code example for LFU implementation?

MagicBuddy
MagicBuddy

Sure! Here's a simple Python example using a dictionary for the cache and a min-heap for frequency management.

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