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这个好方法其实就是验证 (n%t*10+1)%t 的结果和 (n*10+1)%t 的结果是否一致，n不一定是111..1，经验证，真的是一样的，代码附后，在简化就是 (n%t*10)%t 和 (n*10)%t 的结果一样 Followed by:
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