LFU Cache
Examples
Example 1:
Input: ["LFUCache","put","put","get","put","get","get","put","get","get","get"]
[[2],[1,1],[2,2],[1],[3,3],[2],[3],[4,4],[1],[3],[4]]
Output: [null,null,null,1,null,-1,3,null,-1,3,4]
Explanation:
Example 2:
Input: ["LFUCache","put","get"]
[[0],[1,1],[1]]
Output: [null,null,-1]
Explanation: