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喵的，看到数字根本想果断水过，但是1WA，原来求和再取模就可以了

Posted by lzq08ms at 2011-06-04 16:25:24 on Problem 1519 and last updated at 2011-06-04 16:37:48 
不要高精度也可以，字符串记录之后求和，对9取模，任何数字+9以后其数字根不会变的，所以对于一个数，加上9的n倍之后它的数字根还是原来的值。故对9取模就可以，而当模为0是就是9

说到这里推荐大家玩一个游戏，《极限脱出 9小时9个人9扇门》，里面有一些关于数字根的有趣谜题
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