Puzzleup 2013 (5) Pool Of Problems - 拼圖

By Brianna
at 2013-08-21T19:45
at 2013-08-21T19:45
Table of Contents
題目網址: http://www.puzzleup.com/2013/
http://www.puzzleup.com/2013/puzzle/?246
答題時限: 8月22日7PM-比賽結束(約12月11日)
加分時限: 8月22日7PM-8月26日6:59PM
答對可得基本分100分。答案可上傳5次,每改1次答案從基本分扣20分。
比賽期間內可隨時上傳答案,加分時限內答對第n天加(6-n)分
另依題目的難易有額外加分(如有80%的人這題答錯,答對者加80分)
◆Pool Of Problems
Using a pool of problems, 20 tests will be formed.
-Every test should have the same number of problems.
-Any problem should be included in at most 10 tests.
-For every 5 tests, there should be at least 2 problems common to all of them.
What can be the minimum number of problems in this pool?
你必須從題庫中出題設計二十份考題。
- 每份考題都要有一樣多的題目
- 每道題目最多在十份考題中出現
- 任意五個考題都至少要有兩題一樣的題目
請問滿足這個條件的題庫至少要有幾題?
--
http://www.puzzleup.com/2013/puzzle/?246
答題時限: 8月22日7PM-比賽結束(約12月11日)
加分時限: 8月22日7PM-8月26日6:59PM
答對可得基本分100分。答案可上傳5次,每改1次答案從基本分扣20分。
比賽期間內可隨時上傳答案,加分時限內答對第n天加(6-n)分
另依題目的難易有額外加分(如有80%的人這題答錯,答對者加80分)
◆Pool Of Problems
Using a pool of problems, 20 tests will be formed.
-Every test should have the same number of problems.
-Any problem should be included in at most 10 tests.
-For every 5 tests, there should be at least 2 problems common to all of them.
What can be the minimum number of problems in this pool?
你必須從題庫中出題設計二十份考題。
- 每份考題都要有一樣多的題目
- 每道題目最多在十份考題中出現
- 任意五個考題都至少要有兩題一樣的題目
請問滿足這個條件的題庫至少要有幾題?
--
Tags:
拼圖
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