「codeforces - 650D」Zip-line
link。兔兔弹性的因。考虑一次修改产生的影响,求出前缀 lis 长度和后缀 lis 长度,然后一个一个一个一个。struct seg_tree {
int ms, mh;
vi...
In mathematics you don't understand things, you just get used to them.
In mathematics you don't understand things, you just get used to them.