Tree Traverse , Inorder,  Preorder, PostOrder
Tree- Introduction, Types, Insertion
LeetCode#118  Pascal's Triangle
LeetCode#21 Merge Two Sorted Lists
LeetCode#217.  Contains Duplicate
Kahn's Topological Sort  Algorithm  Theory And Implementation In Java:-
Container With Most Water || Trapping Rain Water
Activity Selection Problem
Affiliate link
Known Algos of Greedy
Detect Cycle In An Undirected Graph | Using BFS | Data Structure And Algorithms
BFS Graph Traversals (With Implementation In JAVA Recursive And Iterative Both ) | Breadth First Search | Data structures
Greedy Chouce Property || Optimal Substructure
334  Increasing Triplet Subsequence LeetCode
Adjacency List Theory And Implementation In Java
Components of Greedy Algo