摘要: https://nanti.jisuanke.com/t/31460 tree[rt].ans = tree[rt include define lson l,m,rt 1; build(lson); build(rson); pushup(rt); } void update(int p, ll 阅读全文
posted @ 2018-09-20 22:32 Stolf 阅读(173) 评论(0) 推荐(0) 编辑