PuzzleUp 2009 (10) Coins - 拼圖
By Edith
at 2009-09-23T21:48
at 2009-09-23T21:48
Table of Contents
首頁:http://www.puzzleup.com/2009/?home
時限:2009/09/17(四)19:00~09/22(二)18:59
答案可上傳5次,但每改1次扣20分(基本分為100分)
在比賽期間內可隨時回答,但只有在時限內回答者有額外加分
◆Coins
某個國家中,只要最多2枚硬幣,就可以表達出1至50元的數值(1和50皆包含在內)
在這個國家中,所有種類的硬幣幣值,其總和的最小可能值為何?
假設題目要求的是可以表達1~8元的數值
硬幣最小總和為8元,分別是1元, 3元, 和4元
1元 = 1個1元硬幣
2元 = 2個1元硬幣
3元 = 1個3元硬幣
4元 = 1個4元硬幣
5元 = 1個1元硬幣 + 1個4元硬幣
6元 = 2個3元硬幣
7元 = 1個3元硬幣 + 1個4元硬幣
8元 = 2個4元硬幣
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