deletion of array elements

I am doing a program which will delete the duplicate match pair from the matching pair list between two string.It will print all the arrays except those duplicate pairs.
suppose ,from two given sequence we got the following matching pairs based on their positions
p[0]=(0,1)
p[1]=(0,5)
p[2]=(1,0)
p[3]=(1,2)
p[4]=(1,7)
p[5]=(2,4)
p[6]=(2,6)
p[7]=(3,3)
p[8]=(3,8)
p[9]=(4,0)
p[10]=(4,2)
now,i want to delete the pairs which has the same element,i.e.(0,1)&(1,0) are the pairs which contained the same elements.
I want to delete(1,0)& like that (4,2).
the final result should be printed all the matching pairs except (1,0)&(4,2).

i am trying this i am facing problem...how it is possible in C.
plz.. help...

 

Code:

#include <stdio.h>

int main()
{
    const char *p[11];
    int i, j, a[11][2];
    p[0] = "(0,1)";
    p[1] = "(0,5)";
    p[2] = "(1,0)";
    p[3] = "(1,2)";
    p[4] = "(1,7)";
    p[5] = "(2,4)";
    p[6] = "(2,6)";
    p[7] = "(3,3)";
    p[8] = "(3,8)";
    p[9] = "(4,0)";
    p[10] = "(4,2)";
    for (i = 0; i < 11; ++i)
    {
        sscanf(p[i], "(%d,%d)", &a[i][0], &a[i][1]);
        for (j = 0; j < i; ++j)
        {
            if ((a[i][0] == a[j][0] && a[i][1] == a[j][1]) || (a[i][0] == a[j][1] && a[i][1] == a[j][0]))
            {
                p[i] = NULL;
            }
        }
    }
    for (i = 0; i < 11; ++i)
    {
        if (p[i] != NULL)
        {
            puts(p[i]);
        }
    }
    return 0;
}

 

thanks DRK for reply...

 

lcs problem

Let, we have 3 sequences,
1 2 34 56 7 8 910 11 12
s1=a c t t c a g g c t a a
s2=t t c t a a a g c a a t
s3=a a c c g t a t t c g a
the method finding 1st relative position of a,g,t,c.
a=(1,5,1)
t=(3,1,6)
g=(7,8,5)
c=(2,3,3)
then find Xa=1+5+1,Xt=(3+1+6),Xg=(7+8+5),Xc=(2+3+3)
Ya=|1-5|+|5-1|+|1-1| thus find for each t,g,c
Za=Xa+Ya
then find the minimum Za.here the minimum is Zc.
then the corresponding charecter will represent the longest common subsequences.
then, the string is visited from after(2,3,3) 7 the index will have to be started from 1 to find the identical charecterset.
1 2 34 56 7 8 910 11 12
s1=a c t t c a g g c t a a
s2=t t c t a a a g c a a t
s3=a a c c g t a t t c g a
if (2,3,3) is the minimum, then the next pair are
a=(4,2,4),t=(1,1,3),g=(5,5,2),c=(3,6,1)
I need the the code...to do this.
I am able to find the 1st minimum pairs but the next step i am unable to do.
plz help me....
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