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#Tree
BST Traversals
Invert Binary Tree
BST Construction
Same Tree
Validate Binary Search Tree
#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
Number of Islands
#Trie
Trie Construction