1997 Woburn Computer Programming Challenge
Searching and sorting are part of the theory and practice of computer science. For example, binary search provides a good example of an easy-to-understand algorithm with sublinear complexity. Quicksort is an efficient [average case] comparison sort. KWIC-indexing is an indexing method that permits efficient "human search" of, for example, a list of titles.
Given a list of titles and a list of "words to ignore," you are to write
a program that generates a KWIC (Key Word In Context) index of the
titles. In a KWIC-index, a title is listed once for each keyword that
occurs in the title. The KWIC-index is alphabetized by keyword. Any word
that is not one of the "words to ignore" is a potential keyword. For
example, if the words to ignore are the
, of
, and
, as
, and a
and the list of titles is
- descent of man
- the ascent of man
- the old man and the sea
- a portrait of the artist as a young man
A KWIC-index of these titles might be given by
a portrait of the | ARTIST | as a young man |
the | ASCENT | of man |
DESCENT | of man | |
descent of | MAN | |
the ascent of | MAN | |
the old | MAN | and the sea |
a portrait of the artist as a young | MAN | |
the | OLD | man and the sea |
a | PORTRAIT | of the artist as a young man |
the old man and the | SEA | |
a portrait of the artist as a | YOUNG | man |
Input Specification
The first few lines of the input are a series of "words to ignore." Each
is on a line by itself and is no more than characters in length.
The list of words to ignore is terminated by the string ::
on a line by
itself.
The next lines are the titles to be incorporated into the KWIC-index.
Each contains no more than words, all in lowercase, separated by
single spaces. No word is longer than characters, and no title is longer
than characters.
There will be no more than words to ignore, no more than titles,
and no more than keywords in the titles. No characters other than
a
to z
and white spaces will appear in the input.
Output Specification
The output should be a KWIC-index of the titles, with each title appearing once for each keyword in the title, and with the KWIC-index alphabetized by keyword. If a word appears more than once in a title, each instance is a potential keyword. The keyword should appear in all uppercase letters; all other words should be lowercase letters. Titles in the KWIC-index with the same keyword should appear in the same order as they appeared in the input file. In the case where multiple instances of a word are keywords in the same title, the keywords should be capitalized in left-to-right order. The titles in the KWIC-index should NOT be justified by keyword, and must be listed left-justified.
Sample Input
is
the
of
and
as
a
but
::
descent of man
the ascent of man
the old man and the sea
a portrait of the artist as a young man
a man is a man but bubblesort is a dog
Sample Output
a portrait of the ARTIST as a young man
the ASCENT of man
a man is a man but BUBBLESORT is a dog
DESCENT of man
a man is a man but bubblesort is a DOG
descent of MAN
the ascent of MAN
the old MAN and the sea
a portrait of the artist as a young MAN
a MAN is a man but bubblesort is a dog
a man is a MAN but bubblesort is a dog
the OLD man and the sea
a PORTRAIT of the artist as a young man
the old man and the SEA
a portrait of the artist as a YOUNG man
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