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若不存在整数k，高精度二分不一定要向下取整，因此WA比如 60 1152921504606846975 （1152921504606846975是2的60次方-1） 因为超过double精度所以后面的-1被忽略了，用double的程序输出2； 而因为-1，所以p比2^60小，向下取整的高精度二分会输出1； 岂不是二分还要看double的精度来取整？？？ 数据该改一改了“there exists an integer k, 1<=k<=109 such that kn = p.” Followed by:
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