I use PERL to participate in many online quiz websites like codechef, hackerrank etc. In such contest, installing a module like Graphs is not allowed. I observed that no one attempts such problem using PERL, most of them use C++, but in other problems, people do you PERL a lot.

I am looking for a approach in PERL without using any module for TREE problems

Sample problem: find shortest path from a to b

Input
line 1= no of vertex(v) and no of edges(e)(separated by space)
Next e lines containing v1 and v2 ie there exists a edge between v1 and v2
Next line contains a and b
Sample:
5 6
1 2
2 3
2 4
4 5
1 3
3 5
1 5
So we want shortest path from 1 to 5
OUTPUT
1-3-5

In reply to Tree in perl by saurabh2k26

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.