I need to implement Excel's VLOOKUP with RANGE_SEARCH set to true. E.g., given an array, I can iterate to find the index of the element with the smallest value greater than my key; but if I have a sorted array, I can do much better with a binary search. Further, I would like to be able to update the array (insert elements in the middle) with minimal cost. C++ std::map does this almost automatically. I can implement upper_bound better than most other perl users. I can also make a RB or AVL tree from scratch. But, such standard functionality -- is there a cheap/easy way to get sub O(N) performance, using the out-of-the-box functionality of perl?

In reply to Re^2: maintaining a sorted structure by Anonymous Monk
in thread maintaining a sorted structure by Anonymous Monk

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.