摘要: "ref" cpp include include using namespace std; typedef long long ll; int n, a[270005], b[270005], c[270005], rev[270005]; const int mod=998244353, gg= 阅读全文
posted @ 2018-06-07 17:12 poorpool 阅读(178) 评论(0) 推荐(0) 编辑