What is the largest number of entries that are interrogated...

Name: Problem 48, Chapter 5: Computer Science - An Overview
Uploaded: 2022-01-10T20:58:39-08:00
Duration: 1 min 45 s
Channel: Florencia Cuzmar
Description: What is the largest number of entries that are interrogated if the binary search algorithm (Figure 5.14 ) is applied to a list of 4,000 names? How does this compare to the sequential search (Figure 5.6 )?

What is the largest number of entries that are interrogated if the binary search algorithm (Figure 5.14 ) is applied to a list of 4,000 names? How does this compare to the sequential search (Figure 5.6 )?

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Key Concepts

Binary Search Algorithm

Binary search is a divide-and-conquer algorithm that repeatedly splits the sorted list in half to locate a target value. In each step, it compares the middle entry to the target and then continues the search in the appropriate half of the list. This method typically requires on the order of log?(n) comparisons in the worst-case, meaning that for a list with 4,000 entries, only about log?(4000) comparisons (roughly 12) are needed in the worst-case scenario.

Sequential Search Algorithm

Sequential search is a straightforward algorithm that checks each entry in a list one by one until the target is found or the list is exhausted. In the worst-case scenario, where the target is at the end of the list or not present at all, the algorithm will examine every entry, leading to n comparisons for a list of n items. For 4,000 names, this means up to 4,000 comparisons could be required.

Algorithmic Efficiency

Algorithmic efficiency evaluates the performance of an algorithm in terms of resource usage as the input size grows. Binary search operates in logarithmic time (O(log n)), making it highly efficient for large, sorted datasets compared to sequential search, which operates in linear time (O(n)). This comparison highlights the substantial difference in performance, especially as the dataset size increases.

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