标签：des esc solution 开区 https ble class www problem
[SDOI2008]校门外的区间
### Solution
两个整数之间再建一个点（如\(1\)和\(2\)之间再建一个\(1.5\)这个点），然后把开区间变成\(\pm1.5\)的闭区间
如\((1,5)\)变成\([1.5,4.5]\)
\(U\) 区间涂色
\(I\) 两侧区间涂\(0\)
\(D\) 区间涂\(0\)
\(C\) 两侧涂\(0\),中间取反
\(S\) 区间取反
标签：des esc solution 开区 https ble class www problem
原文地址：https://www.cnblogs.com/Agakiss/p/11666301.html
