It is a well-known fact that if you mix up the letters of a word, while leaving the first and last
letters in their places, words still remain readable. For example, the sentence “tihs snetncee
mkaes prfecet sesne”, makes perfect sense to most people.
If you remove all spaces from a sentence, it still remains perfectly readable, see for example:
“thissentencemakesperfectsense”, however if you combine these two things, first shuffling,
then removing spaces, things get hard. The following sentence is harder to decipher:
You’re given a sentence in the last form, together with a dictionary of valid words and
are asked to decipher the text
On the first line one positive number: the number of testcases, at most 100. After that per
• One line with a string s: the sentence to decipher. The sentence consists of lowercase
letters and has a length of at least 1 and at most 1 000 characters.
• One line with an integer n with 1 n 10 000: the number of words in the dictionary.
• n lines with one word each. A word consists of lowercase letters and has a length of at
least 1 and at most 100 characters. All the words are unique.
• One line with the deciphered sentence, if it is possible to uniquely decipher it. Otherwise
“impossible” or “ambiguous”, depending on which is the case.
this sentence makes perfect sense
The 2007 ACM Northwestern European Programming Contest