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What will be the cost of the code if character ci is at depth di and occurs at frequency fi?

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in Data Structures & Algorithms II by (89.1k points)
What will be the cost of the code if character ci is at depth di and occurs at frequency fi?

(a) cifi

(b) ∫cifi

(c) ∑fidi

(d) fidi

The question was asked during an interview.

The query is from Greedy Algorithms topic in chapter Greedy Algorithms of Data Structures & Algorithms II

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The correct choice is (c) ∑fidi

The best I can explain: If character ci is at depth di and occurs at frequency fi, the cost of the codeword obtained is ∑fidi.

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