460. LFU Cache - LeetCode Understand O(1) Solution in Java | THE CODE WIZARD смотреть онлайн

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In this video, I solved the "460. LFU Cache" problem from LeetCode. This is a leetcode hard-level mapping problem that was asked on Daily LeetCoding Challenge on 29th January 2023 I solved it using Java. This video contains a java solution that uses a combination of HashMap and LinkedHashSet data structures to solve the "LFU Cache" LeetCode daily challenge problem efficiently.

Problem: Design and implement a data structure for a Least Frequently Used (LFU) cache.
Implement the LFUCache class:
LFUCache(int capacity) Initializes the object with the capacity of the data structure.
int get(int key) Gets the value of the key if the key exists in the cache. Otherwise, returns -1.
void put(int key, int value) Update the value of the key if present or inserts the key if not already present. When the cache reaches its capacity, it should invalidate and remove the least frequently used key before inserting a new item. For this problem, when there is a tie (i.e., two or more keys with the same frequency), the least recently used key would be invalidated.
To determine the least frequently used key, a use counter is maintained for each key in the cache. The key with the smallest use counter is the least frequently used key.
When a key is first inserted into the cache, its use counter is set to 1 (due to the put operation). The use counter for a key in the cache is incremented either a get or put operation is called on it.
The functions get and put must each run in O(1) average time complexity.

I have shown a solution that is based on a combination of HashMap and the LinkedHashSet Data Structure approach.

I hope you found this video helpful!
If you have any questions or suggestions, please leave them in the comments below.
Thank you for watching!??

Problem Link: https://leetcode.com/problems/lfu-cache/
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Keywords relevant to this problem:
460. LFU Cache
LFU Cache
LFU Cache Mapping Approach
LFU Cache LeetCode Solution
Mapping problems LeetCode
Java Programming

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