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ADFRUITS

ADFRUITS-Advanced Fruits


#include <iostream>

using namespace std;

int dp[101][101];

char str[202];

int main()
{
    string a, b;

    int l1, l2, i, j;


    while(cin >> a >> b)
    {

        l1 = a.size();
        l2 = b.size();

        //max length of common substring
        for(i = 0; i <= l1; i++)
        {
            for(j = 0; j <= l2; j++)
            {
                if(i == 0 || j == 0)
                    dp[i][j] = 0;

                else
                {
                    if(a[i - 1] == b[j - 1])
                    {
                        dp[i][j] = dp[i - 1][j - 1] + 1;
                    }
                    else
                    {
                        dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
                    }
                }
            }
        }

        int index = dp[l1][l2];

        char lcs[index + 1];

        lcs[index] = '\0';

        index--;

        i = l1, j = l2;

        //stores the common sub string in lcs array
        while(i > 0 && j > 0)
        {

            if(a[i - 1] == b[j - 1])
            {
                lcs[index] = a[i - 1];

                i--, j--,index--;
            }
            else
            {
                if(dp[i - 1][j] > dp[i][j - 1])
                {
                    i--;
                }
                else
                    j--;
            }
        }

        for(i = 0; i <= l1 + l2; i++)
        {
            str[i] = '\0';
        }

        i = j = index = 0;
        int k = 0;

        while(lcs[index])
        {
            while(a[i] != lcs[index] || b[j] != lcs[index])
            {

                if(a[i] != lcs[index] && i < l1)
                {
                    str[k++] = a[i];
                    i++;
                }

                if(b[j] != lcs[index] && j < l2)
                {
                    str[k++] = b[j];
                    j++;
                }
            }

            str[k++] = lcs[index];
            index++, i++, j++;
        }

        if(i < l1)
        {
            while(i < l1)
            {
                str[k++] = a[i++];
            }
        }

        if(j < l2)
        {
            while(j < l2)
            {
                str[k++] = b[j++];
            }
        }


        cout << str << endl;
    }

    return 0;
}

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