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레이팅 미적용의견: 0
\(6^{th}\) round, March \(8^{th}\), 2014
Little Ivica got himself a summer job at a company that produces computer fonts. The branch of the
company where Ivica works at specialises in testing computer fonts and Ivica's team is responsible of
testing only lowercase letters of the English alphabet.
The letters are tested so that various sentences using those letters are printed out and then manually
(more accurately, visually) checked if everything is arranged properly. Only sentences which contain all
26 lowercase letter of the English alphabet (\(a-z\)) are used for testing purposes. These sentences are
called test sentences.
You've probably already assumed that Ivica's job is to find test sentences. He has a dictionary which
consists of N words and has to calculate how many different test sentences can be made out of those
words. Every word from the dictionary can be used only once in the sentence and the order of the
words in the sentence is irrelevant (i.e. “uvijek jedem sarmu” and “jedem sarmu uvijek” are equal
sentences).
The first line of input contains the integer N (\(1 \le N \le 25\)), the number of words in the dictionary.
Each of the following N lines contains a single word from the dictionary, its length not exceeding 100.
All the words from the dictionary are going to be unique.
The first and only line of output must contain the required number from the task.
9
the
quick
brown
fox
jumps
over
a
sleazy
dog23
a
b
c015
abcdefghijkl
bcdefghijklm
cdefghijklmn
defghijklmno
efghijklmnop
fghijklmnopq
ghijklmnopqr
hijklmnopqrs
ijklmnopqrst
jklmnopqrstu
klmnopqrstuv
lmnopqrstuvw
mnopqrstuvwx
nopqrstuvwxy
opqrstuvwxyz8189Clarification of the first example: All words but the word “a” must be used in the test sentence
because each word contains a letter that cannot be found in any other word. Therefore, there are two
possible solutions. The first one being the sentence which consists of all the words and the second one
being the sentence which consists of all the words apart from the word “a”.
Clarification of the third example: Given that the example is long, we stress that all the words from
the example consist of consecutive letters of the English alphabet.
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