Task 1. Consider GCET's central library where the librarian Mario is required to sort the books before closing each day. The library has long shelves and the books are numbered through 1 to N, the librarian wishes to arrange the books so that they appear in the sequence 1,2,..., N. He intends to do this by a sequence of moves. In each move Mario can pick up any book and insert it at a different place. Let he has 5 books and they are initially arranged in the order: 14532 Mario will rearrange this in ascending order by first moving book 2 to the beginning of the shelf to get : 12453 Then moving book 3 to position 3, he gets 12345

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Topological Sort

Topological sort is a sorting technique that sets up a hierarchy in a process. In this technique, when a directed network has nodes connected by arrows, the root node is placed before the successor node.