Re: [代數] 質數與排列組合
就套你的例子.只是把店名改成2的次方
舉例來說
: A去了1、2號,B去了3號,C去了1、4號
: 最簡單的紀錄方式是
: A:1100
: B:0010
: C:1001
1號記為1 2號記為2 3號記為4 4號記為8 5號記為16 ...
A= 1+2=3 . B= 4 . C =1+8=9 ....
今天 D = 53 .你想知道他去那些店.就用短除法. http://imgur.com/a/zgYVd
53 = 1+4+16+32 再去還原嚕
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05/12 09:39, , 1F
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05/12 17:52, , 17F
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