Wrong !!!

void printlcs(ll i, ll j)
{
    if(s1[i] == '\0' || s2[j] == '\0')
    {
        cout << ans  << endl ;
        return ;
    }
    if(s1[i] == s2[j])
    {
        ans += s1[i] ;
        printlcs(i+1, j+1) ;
        ans.erase(ans.end()-1) ;
    }
    else
    {
        if(dp[i+1][j] > dp[i][j+1])
            printlcs(i+1, j);
        else if(dp[i+1][j] < dp[i][j+1])
            printlcs(i, j+1);
        else
        {
            if(s1[i+1] < s1[i])
            {
                printlcs(i+1 , j) ;
            }
            else
            {
                printlcs(i , j+1) ;
            }
        }

    }
    return ;
}