A text is made up of the characters a, b, c, d, e each occurring with the probability 0.11, 0.40, 0.16, 0.09 and 0.24, respectively. The optimal Huffman coding technique will have the average length of:a.2.15b.2.26c.2.40d.2.16
Question
A text is made up of the characters a, b, c, d, e each occurring with the probability 0.11, 0.40, 0.16, 0.09 and 0.24, respectively. The optimal Huffman coding technique will have the average length of:a.2.15b.2.26c.2.40d.2.16
Solution
To solve this problem, we need to use the Huffman coding technique. This technique is a common algorithm used for lossless data compression. The idea is to assign variable-length codes to input characters, lengths of the assigned codes are based on the frequencies of corresponding characters. The most frequent character gets the smallest code and the least frequent character gets the largest code.
The steps are as follows:
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Create a leaf node for each character and build a min heap of all leaf nodes (Min Heap is used as a priority queue. The value of frequency field is used to compare two nodes in min heap. Initially, the least frequent character is at root)
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Extract two nodes with the minimum frequency from the min heap.
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Create a new internal node with a frequency equal to the sum of the two nodes frequencies. Make the first extracted node as its left child and the other extracted node as its right child. Insert this node into the min heap.
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Repeat steps#2 and #3 until the heap contains only one node. The remaining node is the root node and the tree is complete.
Now, to calculate the average length of the Huffman codes, we multiply the frequency of each character by the length of its Huffman code, and sum these values.
Let's calculate:
- For 'a', the probability is 0.11 and let's assume its Huffman code length is x.
- For 'b', the probability is 0.40 and let's assume its Huffman code length is y.
- For 'c', the probability is 0.16 and let's assume its Huffman code length is z.
- For 'd', the probability is 0.09 and let's assume its Huffman code length is p.
- For 'e', the probability is 0.24 and let's assume its Huffman code length is q.
The average length L is given by:
L = 0.11x + 0.40y + 0.16z + 0.09p + 0.24q
Without the actual Huffman codes, we can't calculate the exact average length. But the Huffman coding technique guarantees that it will be the minimum possible. So, you would need to calculate the Huffman codes first to answer this question.
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