Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Prepared by Ibrahim Mesecan.
Page "Like" Averages
A web site has contacted you to prepare a list for the most liked pages.
The users can rate every page between 1 and 5. Currently web admin stores
the following information in an array.
- Unique id: An auto incremented integer
- Page ID: Every page has a unique ID; integer not greater than 2000
- Rating: an integer between 1 and 5, given by users
- IP adress of the user rated: 15 char string; (at most three digits) 4 integers separated by three periods
Question:
Write a program that is going to read rating information
given by users And then, calculate the like average of every page.
Input specification
The first line contains an integer number (n), the number of ratings in the file
where n is between 1 and 10000. The following n lines contain rating information
as described above.
Output specification
Show existing page IDs followed by the page averages
(with 2 decimal places after the floating point).
Sample Input I
7
1 3 3 119.138.140.197
2 4 1 110.158.121.79
3 3 3 142.190.164.60
4 5 3 105.187.168.146
5 4 4 107.120.121.124
6 6 2 118.197.154.183
7 3 4 142.190.164.60
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Sample Output I
3 3.33
4 2.5
5 3
6 2
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Sample Input II
8
1 2 1 126.176.189.21
2 1 3 131.172.181.60
3 6 5 123.132.179.120
4 7 2 108.115.183.218
5 1 5 119.154.152.107
6 3 1 114.176.160.128
7 5 2 124.125.91.158
8 1 2 145.179.130.157
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Sample Output II
1 3.33
2 1
3 1
5 2
6 5
7 2
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Для отправки решений необходимо выполнить вход.
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