Update Postorder_Traversal_Iterative.cpp

Update prim_minimum_spanning_tree.cpp

segment tree for min range query

Prim's Minimum spanning tree

Update prim_minimum_spanning_tree.cpp

Create prim_minimum_spanning_tree.cpp

Minimum spanning tree using Kruskal's algo

Minimum spanning tree using Kruskal's algo

union find operations

Using two jugs check if d ltrs of water can be measured

insertion sort for linked list

Update README.md

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Added new solution files