Completed LeetCode problem #460 - LFU Cache
https://leetcode.com/problems/lfu-cache/description/
for the items with the same used frequency, the most recently used stay in the front.
used sequential method to locate the new position for an item so as to improve performance, the recursive method just sucked in performance!!!.
for the items with the same used frequency, the most recently used stay in the front.
used sequential method to locate the new position for an item so as to improve performance, the recursive method just sucked in performance!!!.
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