蒟蒻虽然看不懂，但提醒一下前面大佬：可以用`#define int long long`+`signed main()`解决`long long`问题，最后%%%
by Zjc20120331 @ 2023-07-28 19:28:54
@[Zjc20120331](/user/654928) [记录](https://www.luogu.com.cn/record/117919127)：数据$5\times10^6$+`define int ll `仍然70
by Ben幻影 @ 2023-07-29 08:44:03
@[Ben幻影](/user/354482) 错误类型？
by Zjc20120331 @ 2023-07-29 09:58:43
二分那里改成 $r=min(i,n-i)$, 主函数的for循环里不要$*2$，乘大一点的数，$1e9+7$就行
by M_i_k_u @ 2023-07-29 11:11:50
亲测过了
by M_i_k_u @ 2023-07-29 11:12:10
还不用吸氧
by M_i_k_u @ 2023-07-29 11:12:28
楼主不会怪我用你的代码A了这题吧？
by M_i_k_u @ 2023-07-29 11:13:37