QuestionQuestion

1. We have 5 objects, and the weights and values are
No.   1   2   3   4   5
w    10 20 30 40 50
v      20 30 66 60 55
The knapsack can carry a weight not exceeding 90, find a subset items and give the total weight and value for following algorithms:
1) By using the algorithm of greedy of value for 0-1 knapsack problem? By selecting the highest value first.
2) By using the algorithm of greedy of weight for 0-1 knapsack problem? By selecting lightest item first.
3) By using the algorithm of greedy of density for 0-1 knapsack problem? By selecting the highest density item first.
4) By using the algorithm of greedy of density for fractional knapsack problem? By selecting the highest density item first.

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In this version of the problem we can either take an object or not (since it is 0-1 Knapsack). We sort the object in the non-increasing order by their values and we take the corresponding object as long as weight does not exceed 90.
This algorithm will take into knapsack: object 3, object 4, and object 2 (we notice it can’t take object 5 after object 4 because the maximum allowed weight would be exceeded).
The achieved weight is 30 + 40 +20 =90.
The achieved value is 66 + 60 + 30 = 156....

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