2727 - [ Enqueue an element in Queue] ( #enqueue-an-element-in-queue )
2828 - [ Dequeue an element from Queue] ( #dequeue-an-element-from-queue )
2929- [ Tree] ( #tree )
30- - [ Binary Tree] ( #binary-tree )
30+ - [ Breadth-first Traversal] ( #breadth-first-traversal )
31+ - [ Binary Tree] ( #binary-tree )
3132 - [ Binary Search Tree (BST)] ( #binary-search-tree-bst )
32- - [ Trie] ( #trie )
33+ - [ Trie] ( #trie )
3334 - [ Heap ( Priority Queue )] ( #heap--priority-queue- )
3435 - [ Hash-Table] ( #hash-table )
3536 - [ Graph] ( #graph )
5253- [ Mock Interview] ( #mock-interview )
5354 - [ Get the Average value at each level of the tree] ( #get-the-average-value-at-each-level-of-the-tree )
5455 - [ ADT] ( #adt )
56+ - [ References] ( #references )
5557
5658## Working with this repo
5759
@@ -280,7 +282,9 @@ If you want to store hierarchical data use Tree.
280282
281283You should know about ` Binary Tree ` and ` Binary Search Tree ` .
282284
283- ### Binary Tree
285+ ### Breadth-first Traversal
286+
287+ ## Binary Tree
284288
285289A binary tree is a type of tree in which each node has ` at most two children ` (0, 1 or 2) which are referred as left child and right child.
286290
@@ -304,9 +308,9 @@ Below image showing how to add `[3, 7, 4, 6, 5, 1, 10, 2, 9, 8]` in BST.
304308![ ] ( https://i.imgur.com/qkefQzD.png )
305309
306310- [ Binary Search Tree Implementation Exercise] ( https://codepen.io/roopkt/pen/RwpJBOw?editors=0010 )
307- - [ Binary Search Tree Implementation Answer] ( https://codepen.io/roopkt/pen/RwpJBOw ?editors=0010 )
311+ - [ Binary Search Tree Implementation Answer] ( https://codepen.io/roopkt/pen/LYWBYMM ?editors=0010 )
308312
309- ### Trie
313+ ## Trie
310314
311315Trie is a tree, in which we store only one character at each node. This final key value pair is stored in the leaves.
312316
@@ -466,3 +470,8 @@ O(logn)
466470### ADT
467471
468472abstract data type (ADT) - ADT is defined as a user point of view of a data type and Does not talk about how exactly it will be implemented.
473+
474+ ## References
475+
476+ - http://btholt.github.io/four-semesters-of-cs/
477+ - https://btholt.github.io/four-semesters-of-cs-part-two/
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