Author Topic: VC++ - Finding the Unique Elements in an Array with efficient memory usage  (Read 840 times)

kathir

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Here is the VC++ source code for Finding the Unique Elements in an Array with efficient memory usage. The good thing about this coding is it will allocate only the required memory. During the first iterator it will count how many number of unique elemnts are available in an array. Then use the count to allocate the memory and fill in the elements in its second iteration.




#include <stdio.h>
#include <iostream>

int array1[] = { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100,
                 95, 85, 75, 65, 55, 45, 35, 25, 15, 05,
                 10, 15, 20, 25, 30, 35, 40, 45, 50, 55
};

int array2[] = { 15, 25, 35, 45, 55,
                 12, 22, 32, 43, 52,
                 15, 25, 35, 45, 55
};

typedef struct _Array
{
    int *elements;
    int len;
    _Array()
    {
        elements = NULL;
        len = 0;
    }
    _Array(int *data, int len)
    {
        this->elements = new int[len];
        this->len = len;
        for(int i = 0; i < len; i++)
            this->elements = data;
    }
    _Array(int len)
    {
        this->len = len;
        this->elements = new int[len];
    }

    ~_Array()
    {
        if(this->elements != NULL)
        {
            delete [] this->elements;
            this->elements = NULL;
            this->len = 0;
        }
    }

} Array;

Array* BubbleSort(Array *p)
{
    for(int i = 1; i < p->len; i++)
    {
        for(int j = 0; j < p->len - i; j++)
        {
            if(p->elements[j] > p->elements[j + 1])
            {
                int temp = p->elements[j];
                p->elements[j] = p->elements[j + 1];
                p->elements[j + 1] = temp;
            }
        }
    }
    return p;
}

Array* Find_Unique_Elements(Array *p)
{
    p = BubbleSort(p);

    int element = p->elements[0];
    int count = 1;
    for(int i = 1; i < p->len; i++)
    {
        if(element == p->elements)
            continue;
        else
        {
            element = p->elements;
            count++;
        }
    }

    Array *result = new Array(count);
    count = 0;
    element = p->elements[0];
    result->elements[count++] = element;
    for(int i = 1; i < p->len; i++)
    {
        if(element == p->elements)
            continue;
        else
        {
            element = p->elements;
            result->elements[count++] = element;
        }
    }
    return result;
}

int main()
{
    Array *a1 = new Array(array1, sizeof(array1) / sizeof(array1[0]));
    Array *a2 = new Array(array2, sizeof(array2) / sizeof(array2[0]));

    Array *p1 = Find_Unique_Elements(a1);
    Array *p2 = Find_Unique_Elements(a2);


    std::cout << "\n\nUnique Sorted Elements in Array1: ";
    for(int i = 0; i < p1->len; i++)
        std::cout << p1->elements << " ";
    std::cout << "\n\nUnique Sorted Elements in Array2: ";
    for(int i = 0; i < p2->len; i++)
        std::cout << p2->elements << " ";
    std::cout << "\n\n";

    delete a1, a2, p1, p2;
   return 0;
}
« Last Edit: July 07, 2011, 03:05:55 pm by kathir softwareandfinance »

 


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