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*求数根公式:a的数根b = (a-1) % 9 + 1;

*约瑟环问题:f1 = 0; 第i个(i>1),f = (f+m) %i;

Keep It Simple and Stupid.
原文地址:https://www.cnblogs.com/FleetingTime/p/3745654.html