80 lines
2 KiB
C#
80 lines
2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace BotSharp.Algorithm.HiddenMarkovModel.MathHelpers
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{
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/// <summary>
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/// Ascending sort by merge sort
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/// </summary>
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public class MergeSort
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{
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public static void Sort(double[] a)
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{
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double[] aux = new double[a.Length];
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int lo = 0;
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int hi = a.Length - 1;
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Sort(a, aux, lo, hi);
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}
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public static void Sort(double[] a, double[] aux, int lo, int hi)
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{
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if (hi - lo < 5)
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{
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SelectionSort(a, lo, hi);
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return;
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}
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int mid = (hi + lo) / 2;
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Sort(a, aux, lo, mid, hi);
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}
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public static void Sort(double[] a, double[] aux, int lo, int mid, int hi)
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{
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Sort(a, aux, lo, mid);
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Sort(a, aux, mid + 1, hi);
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int i = lo, j = mid + 1;
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for (int k = lo; k <= hi; ++k)
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{
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if (i <= mid && (j > hi || a[i] < a[j]))
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{
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aux[k] = a[i++];
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}
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else
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{
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aux[k] = a[j++];
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}
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}
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for (int k = lo; k <= hi; ++k)
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{
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a[k] = aux[k];
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}
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}
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private static void SelectionSort(double[] a, int lo, int hi)
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{
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for (int i = lo; i <= hi; ++i)
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{
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double c = a[i];
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int jpi = i;
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for (int j = i + 1; j <= hi; ++j)
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{
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if (c > a[j])
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{
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jpi = j;
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c = a[j];
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}
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}
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if (i != jpi)
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{
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double temp = a[i];
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a[i] = a[jpi];
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a[jpi] = temp;
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}
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}
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}
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}
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}
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