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What is the use of greedy algorithms? An real example?
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Prim’s Algorithm , Kruskal Algorithm
Minimum Spanning Tree - Prim's algorithm and Kruskal's algorithm
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More: (Fractional Knapsack Problem, Huffman Coding, Optimal Merging, Topological Sort).
Greedy algorithms is choosing the best/optimal solution in each stage. Look at wikipedia article
Minimum spanning tree algorithms are greedy algorithms
The famous Dijkstra's Algorithm is also greedy algorithm
Anything where an optimal solution would be impossible - or very very hard.
Greedy algorithms take the best solution at the current point, even if that's not the best solution if you examined all aternatives
I'm surprised no one pointed out huffman / shannon encoding ...
http://en.wikipedia.org/wiki/Greedy_algorithm