free udemy course:

Easy to Advanced Data Structures
What you'll learn :
* Mature understanding of data structures
* Algorithms associated with data structures
* Dynamic arrays
* Singly and doubly linked list
* Queues & Stacks
* Binary Trees and Binary search trees
* Heaps & Priority queues
* Union find/Disjoint set
* Hash table/Associative array
* Fenwick tree/Binary indexed tree

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