Puzzleup 2018 (5) NUMBER SELECTION - 拼圖

題目網址: http://www.puzzleup.com/2018/
http://www.puzzleup.com/2018/puzzle/?5
答題時限: ８月30日７ＰＭ－比賽結束（約12月12日）
加分時限: ８月30日７ＰＭ－９月5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）　　

◆NUMBER SELECTION

Given any X integers (not necessarily distinct), if it is always possible to
select Y of them whose sum is divisible by 7, what is the minimum value of X
and the corresponding value of Y?

Note: X and Y are positive integers.

If the same question were asked for divisibility by 2, the minimum value of X
would be 3 and the corresponding value of Y would be 2.

Enter the minimum X, then the corresponding Y without using a space in between.

給予X個任意整數(可以重覆)，一定能從中挑選出Y個數，使其總和能整除於7，則X的最
小值與其相應的Y值呢？

註：X與Y都是正整數。

若題目要求整除於2，則X的最小值會是3，相對應的Y會是2。

輸入最小的X，接著相對應的Y，中間無需空格。

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