39 lines
1.7 KiB
C++
39 lines
1.7 KiB
C++
/*#############################################################################
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## Author: Shaun Reed ##
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## Legal: All Content (c) 2022 Shaun Reed, all rights reserved ##
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## About: An example implementation of insertion 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-insertion.hpp"
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#include <vector>
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void InsertionSort(std::vector<int> &array)
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{
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// For each value, move left until we find sortedPosition for keyValue
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// + Starting with keyValue at array[1], to check sortedPosition at array[0]
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for (size_t keyIndex = 1; keyIndex <= array.size(); keyIndex++) {
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// Save the current key value
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// + We will look for the sorted position of this value
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const int keyValue = array[keyIndex];
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// First, check if the value at the previous index is > keyValue
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int sortedPosition = keyIndex - 1;
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// While array[sortedPosition] > keyValue
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while (sortedPosition >= 0 && array[sortedPosition] > keyValue) {
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// The value in the lower index is larger than the keyValue
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// + Move the value at sortedPosition to the right (ascending order)
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array[sortedPosition + 1] = array[sortedPosition];
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// Decrement sortedPosition so we can check the next value
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sortedPosition--;
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}
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// Insert the keyValue in its final sorted position
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// + Once array[sortedPosition] < keyValue, keyValue belongs one index right
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array[sortedPosition + 1] = keyValue;
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}
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}
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