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#Tree
BST In Order Traversal
BST Post Order Traversal
BST Pre Order Traversal
BST Construction
BST Level Order Traversal
#LinkedList
LFU Cache
Linked List Construction
LRU Cache
Middle of a Linked List
Reverse Linked List
#Graph
Number of Islands
#Array
2 Sum
3 Sum
Rotate Image
#BFS
BST Level Order Traversal
Number of Islands
#Trie
Trie Construction