Лимит времени 2000/4000/4000/4000 мс. Лимит памяти 65000/65000/65000/65000 Кб. Question by Ibrahim Mesecan.
Book Index
Question:
The books have indexes at the end, so that, people can
search for a specific topic or section using a keyword.
You are given the index pages with keywords.
Then, you are asked to prepare the index of the book.
Write a program which reads the page and keyword
information. Then, the program should prepare the index
for the book.
Input specification:
In the first line, you will be given an integer:
the number of pages (n) with keywords.
The following n lines start with two integers the page
number (p) and the number of keywords (k) in that page
where keywords are all in lowercase and contain only
26 English letters with no special char.
Then, you will be given k keywords in the same line.
where 1 ≤ n ≤ 10,000 and there may at most 100
keywords in one page.
Output specification:
Show each keyword in a line. Keywords will be in
alphabetical order followed by the page numbers
(in ascending order) that they appear.
Sample Input
4
1 2 book index
4 1 keyword
5 3 index keyword search
7 3 index search appear
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Sample Output
appear 7
book 1
index 1 5 7
keyword 4 5
search 5 7
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Explanation:
There are four pages with keywords given.
The first page contains 2 keywords: book and index.
There are 5 keywords in total and the keyword
"book" appears only in page 1.
Для отправки решений необходимо выполнить вход.
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