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wa的可以看看这个，或许有帮助

Posted by yangguo981 at 2006-08-25 17:06:49 on Problem 2718 
0不能放在数字开头，除非只有一个0。
就是说012这样的组合不能存在，只能存在0。
我之前以为012 = 12，所以错了：）
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