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https://github.com/SerenityOS/serenity
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22f472249d
Implement insertion sort in AK. The cutoff value 7 is a magic number here, values [5, 15] should work well. Main idea of the cutoff is to reduce recursion performed by quicksort to speed up sorting of small partitions.
46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
/*
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* Copyright (c) 2022, Marc Luqué <marc.luque@outlook.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Concepts.h>
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#include <AK/StdLibExtras.h>
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namespace AK {
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// Standard Insertion Sort, with `end` inclusive!
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template<typename Collection, typename Comparator, typename T = decltype(declval<Collection>()[declval<int>()])>
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void insertion_sort(Collection& col, ssize_t start, ssize_t end, Comparator comparator)
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requires(Indexable<Collection, T>)
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{
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for (ssize_t i = start + 1; i <= end; ++i) {
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for (ssize_t j = i; j > 0 && comparator(col[j], col[j - 1]); --j)
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swap(col[j], col[j - 1]);
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}
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}
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template<typename Collection, typename Comparator, typename T = decltype(declval<Collection>()[declval<int>()])>
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void insertion_sort(Collection& collection, Comparator comparator)
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requires(Indexable<Collection, T>)
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{
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if (collection.size() == 0)
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return;
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insertion_sort(collection, 0, collection.size() - 1, move(comparator));
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}
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template<typename Collection, typename T = decltype(declval<Collection>()[declval<int>()])>
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void insertion_sort(Collection& collection)
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requires(Indexable<Collection, T>)
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{
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if (collection.size() == 0)
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return;
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insertion_sort(collection, 0, collection.size() - 1, [](auto& a, auto& b) { return a < b; });
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}
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}
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using AK::insertion_sort;
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