@[Ycyofmine](/user/803657) 您好，题目已经说过 $a_n\neq0$
by yukimianyan @ 2022-11-09 17:12:43
Other:Why the first solution's code is the same as the second one?
by 晴空一鹤 @ 2022-11-09 17:15:58
针对首次输出是正数时是否输出+做了一些小改动——从n变成了first，如果一直为0，first就会相应减小。上面的佬已经明确了数据An≠0，所以就不需要first了(=・ω・=)
by Ycyofmine @ 2022-11-09 19:08:07