相关链接
题目传送门：http://www.lydsy.com/JudgeOnline/problem.php?id=4377
神犇题解：http://blog.csdn.net/commonc/article/details/51282041
解题报告
考虑一个匹配的第一个位置是x的话
第i个位置实际的值就是 $ (x + (i – 1)a)\% n$
然后这个位置显然会受到限制，形如：$ {p_1} < x < {p_2}$的限制条件
于是对于限制条件的反区间取并，然后从总区间中减去，剩下的就是符合条件的开头啦！
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