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Use a double-linked list to store the pages with the most recently used page in the head of the list and the least recently used page in the back of the list.
- maximus_algorius August 12, 2013APage<=>BPage<=>CPage
Then use a map to map the page ID to the page.
A->APage
B->BPage
C->CPage
Search: O(1) from the map, O(1) remove and add to front of list
Insert: O(1) in the map, O(1) by adding to the front of the list
Replace: O(1) in the map, O(1) by removing from back of list and adding to front of list