43 lines
1.8 KiB
C++
43 lines
1.8 KiB
C++
/*#############################################################################
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## Author: Shaun Reed ##
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## Legal: All Content (c) 2021 Shaun Reed, all rights reserved ##
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## About: An example implementation of bucket sort using a custom library ##
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## ##
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## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com | GitHub: shaunrd0 ##
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###############################################################################
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*/
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#include "lib-bucket.hpp"
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#include <algorithm>
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#include <list>
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#include <vector>
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void BucketSort(std::vector<float> &array)
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{
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// For this example, we need an array of linked lists
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// + Each value of this array will be referred to as a bucket
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// + Each list stores the values that fall within the range of that bucket
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std::vector<std::list<float>> bucketArray(BUCKET_ARRAY_LENGTH);
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// Truncation to zero will always floor the result of division
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// + If the bucket contains negative values, convert them to their absolutes
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// + Run BucketSort on the abs values, then convert them back to negative
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// ++ For a mixed-bag of negative and positive, track which values you absolute
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// ++ Then only negate those values after BucketSort
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for (const auto & value : array) {
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bucketArray[value / static_cast<float>(bucketArray.size())].push_back(value);
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}
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// Track the last used index in the final sorted array; Starting at 0
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int currentIndex = 0;
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// Sort each bucket in the bucketArray
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for (std::list<float> &bucket : bucketArray) {
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bucket.sort();
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// After sorting each bucket, rewrite values in-order to final sorted array
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for (const auto &value : bucket) array[currentIndex++] = value;
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}
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}
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