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appleshan/求大、白、胖分别是哪3个数字

Created January 18, 2017 03:24
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求大、白、胖分别是哪3个数字
Haskell在数学问题上非常有表现力，有所有编程语言都羡慕不来的List comprehension，
比如：一个小学一年级的数学题：“大白 + 大白 = 白胖胖，求大、白、胖分别是哪3个数字”：
Haskell描述：
Prelude> [(大, 白, 胖)| 大 <- [1..9], 白 <- [1..9], 胖 <- [0..9], 大*10+白+大*10+白 == 白*100+胖*10+胖]
[(6,1,2)]
Prelude> 61+61 == 122
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