Data structures(indexed Sequential Search)

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Indexed Sequential Search

In this searching method, first of all, an index file is created, that contains some specific group or division of required record when the index is obtained, then the partial indexing takes less time cause it is located in a specified group.

Characteristics of Indexed Sequential Search:

·        In Indexed Sequential Search a sorted index is set aside in addition to the array.

·        Each element in the index points to a block of elements in the array or another expanded index.

·        The index is searched 1st then the array and guides the search in the array.

Note: Indexed Sequential Search actually does the indexing multiple time, like creating the index of an index. 
 

Explanation by diagram “Indexed Sequential Search”:






void indexedSequentialSearch(int arr[], int n, int k)

{

    int GN = 3; // GN is group number that is number of

                // elements in a group

    int elements[GN], indices[GN], i, set = 0;

    int j = 0, ind = 0, start, end;

    for (i = 0; i < n; i += 3) {

 

        // Storing element

        elements[ind] = arr[i];

 

        // Storing the index

        indices[ind] = i;

        ind++;

    }

    if (k < elements[0]) {

        printf("Not found");

        exit(0);

    }

    else {

        for (i = 1; i <= ind; i++)

            if (k <= elements[i]) {

                start = indices[i - 1];

                end = indices[i];

                set = 1;

                break;

            }

    }

    if (set == 0) {

        start = indices[GN - 1];

        end = GN;

    }

    for (i = start; i <= end; i++) {

        if (k == arr[i]) {

            j = 1;

            break;

        }

    }

    if (j == 1)

        printf("Found at index %d", i);

    else

        printf("Not found");

}

 

// Driver code

void main()

{

 

    int arr[] = { 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };

    int n = sizeof(arr) / sizeof(arr[0]);

 

    // Element to search

    int k = 8;

    indexedSequentialSearch(arr, n, k);

}

 

 

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