相关链接
题目传送门：http://www.lydsy.com/JudgeOnline/problem.php?id=4722
神犇题解Ⅰ：http://blog.csdn.net/werkeytom_ftd/article/details/54429577
神犇题解Ⅱ：http://www.cnblogs.com/wxxlouisa/p/6139165.html
解题报告
这题看起来一眼不可做啊！
仔细想一想，发现确实不会做
看完题解后：果然是乱搞题！
先不管修改操作的话，如果询问的区间长度超过13的话，一定有解
相关证明可以参见：http://blog.csdn.net/werkeytom_ftd/article/details/54429577
现在考虑修改操作
因为单次询问最多涉及13个数
所以只需要支持单点查询+区间修改就可以了
于是用线段树打标记什么的就可以啦！
然而我们惊讶的发现，我们打的Tag在最后计算的时候会很大
More Formally：次数会爆 $ long long$
于是用不了快速幂了 QwQ
然后又不会了
于是接着去膜拜题解
发现我们可以用类似快速幂一样的东西搞出来
我们最终要求的是：$ {a_i}^{{3^x}}$
于是我们预处理出 $ f(i,j)$ 表示 $ {a_i}^{{3^{{2^j}}}}$
于是像快速幂一样搞一搞就可以啦！
最后我们求出了这13个数是什么，怎么判断有没有解呢？
我们可以 Meet in middle !
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