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请问，那个括号是怎么回事呀？

Posted by byron at 2007-01-10 18:15:30 on Problem 1100
In Reply To:ms全搜就已经很快了…… Posted by:frkstyc at 2007-01-09 13:10:46 
It is also known that the people of the Dreisamwuste did not have prioritization rules for arithmetic operations ？
要是括号也不改变运算顺序的话，那括号是不是和space一样起分隔作用？
否则是不是就要建个表达式树了？……
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