Binary Insertion Sort - CSharp System

CSharp examples for System:IComparable

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Description

Binary Insertion Sort

Demo Code


using System;/*from w  w w.java  2s  . co  m*/

namespace Utility
{
    namespace Algorithms
    {
        namespace Sort
        {
            public static partial class Sort<T>
                where T : IComparable<T>
            {
                public static T[] BinaryInsertionSort(T[] input) { return BinaryInsertionSort(input, 0, input.Length); }

                public static T[] BinaryInsertionSort(T[] input, int start) { return BinaryInsertionSort(input, start, input.Length - start); }

                public static T[] BinaryInsertionSort(T[] input, int start, int length)
                {
                    CheckArguments(input, start, length);

                    T current;
                    int upper, lower, half = 0;

                    if (length <= 1)
                        return input;

                    if (length > 1 && input[start].CompareTo(input[start + 1]) > 0)
                    {
                        current = input[start];
                        input[start] = input[start + 1];
                        input[start + 1] = current;
                    }

                    for (int i = start + 2; i < start + length; i++)
                    {
                        current = input[i];
                        upper = i;
                        lower = start - 1;
                        while (upper > lower + 1)
                        {
                            half = (upper + lower) / 2;
                            if (input[half].CompareTo(current) <= 0)
                                lower = half;
                            else
                                upper = half;
                        }

                        Buffer.BlockCopy(input, (lower + 1) * sizeof(int), input, (lower + 2) * sizeof(int), (i - lower - 1) * sizeof(int));
                        input[lower + 1] = current;
                    }

                    return input;
                }
            }
        }
    }
}

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