we consider a problem where we are given a set of coins and our task is to form a sum of money n using the coins. The values of the coins are coins = {c1, c2,..., ck}, and each coin can be used as many times we want. What is the minimum number of coins needed? For example, if the coins are the euro coins (in cents) {1,2,5,10,20,50,100,200} and n = 520, we need at least four coins. The optimal solution is to select coins 200+200+100+20 whose sum is 520.

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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.