Sort Array along with the Corresponding indices

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Hi,

I have a one-d Array named zz containing {5,3,8,1,9,6}. Current order of indices of the elements is : 0,1,2,3,4,5.

Now I want to sort the array z in ascending order in such a way that its corresponding indices also sort according to its respective elements.

Ex: Elts in Ascending order : 1,3,5,6,8,9

and Respective indices will be : 3,1,0,5,2,4.

Another Ex: What "Additions" should i make to the following code, if the Array Element repeats ?? Epected Oreder of Indices : 1,0,4,3,2

int[] A = new int[6] { 3, 2, 8, 5, 3 };  //{ 5, 3, 8, 1, 9, 6 };
            int[] B = new int[6];
            int[] index = new int[6];
            int flag = 0;
            Console.WriteLine("Array A:");
            for (int i = 0; i < A.Length; i++)
                Console.Write(A[i]);
            Console.WriteLine();
            Array.Copy(A, B, A.Length);
            Console.WriteLine("Array B:");
            for (int i = 0; i < B.Length; i++)
                Console.Write(B[i]);
            Console.WriteLine();
            Array.Sort(A);
            Console.WriteLine("Sorted Array B:");
            for (int i = 0; i < A.Length; i++)
                Console.Write(A[i]);
            Console.WriteLine();


            for (int i = 0; i < 6; i++)
            {
                for (int j = 0; j < 6; j++)
                {
                    flag = 0;
                    for (int k = 0; k < 6; k++)
                    {
                        if (A[j + i] == B[k])
                        {
                            index[i] = k;
                            flag = 1;
                            break;
                        }
                    }
                    if (flag == 1)
                        break;
                }
            }

            Console.WriteLine("Index Array index:");
            for (int i = 0; i < index.Length; i++)
                Console.Write(index[i]);
            Console.Read();

Is there any ready made function available ? Hope the question is clear..~~Kindly provide the solution on urgent basis.~~

Thanks in Advance,

Posted 28-Oct-10 20:53pm

shwetavc30

Updated 28-Oct-10 21:14pm

v3

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Member 4264918 29-Oct-10 3:04am

i am also facing the same problem please provide solution

2 solutions

Solution 1

You want to turn your array into a list of type int, sort that and turn the sorted list back into an array.

var intList = new List<int>(A);
intList.Sort();

var sortedArrayOfIntegers = intList.ToArray();
</int>

hope this helps.

Posted 28-Oct-10 21:37pm

jim lahey

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qontary · Accepted Answer · 2010-10-28T21:57:00

Try this.

C#

int[] A = { 3, 2, 8, 5, 3 };  //{ 5, 3, 8, 1, 9, 6 };
            int[] index = new int[A.Length];
            int[] result = new int[A.Length];
            Array.Copy(A, result, A.Length);
            for (int i = 0; i < A.Length; i++) index[i] = i;
            Console.WriteLine("Input Array:");
            for (int i = 0; i < A.Length; i++)
                Console.Write(A[i]);
            Console.WriteLine();
            Console.WriteLine("Original Index Array:");
            for (int i = 0; i < index.Length; i++)
                Console.Write(index[i]);
            Console.WriteLine();
            int lastIndex = 0;
            int tempValue = 0;
            for (int i = 0; i < A.Length; i++)
            {
                for (int j = i + 1; j < A.Length; j++)
                {
                    if (result[i] > result[j])
                    {
                        tempValue = result[i];
                        result[i] = result[j];
                        result[j] = tempValue;
                        lastIndex = index[i];
                        index[i] = index[j];
                        index[j] = lastIndex;
                    }
                }
            }

            Console.WriteLine("Result Array:");
            for (int i = 0; i < result.Length; i++)
                Console.Write(result[i]);
            Console.WriteLine();
            Console.WriteLine("Sorted Index Array:");
            for (int i = 0; i < index.Length; i++)
                Console.Write(index[i]);
            Console.Read();