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一些注意的地方

Posted by Nstd at 2011-06-02 21:45:01 on Problem 1684
1.所有的输入都是合法的,且单词间可能有多个空格
2.赋值、(带变量的)跳转、自增、自减,这些都要检查变量是否被定义过,没定义过要报错 1
3.若定义一个变量x后,x没被使用过却再次被定义的话,要报错 2

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