摘要：
"这一题" 的环状板 Solution 暴力断环为链， 枚举起点跑 $n$ 遍 $DP$， 取最小值即可 Code cpp include include include include include include include define LL long long define REP(i 阅读全文
摘要：
U40620 niiickの还没想好名字的题 给定一个长度为$n$的序列$a_1,a_2...,a_n$ 要求将这$n$个数分为$m$组，每组可以有任意多个数，但同一组中的数必须是原序列中连续的一段 求如何分组能使得各组的标准差最小， 即求$$min(\sqrt{\sum_{i=1}^m\frac{ 阅读全文
摘要：
P4644 [Usaco2005 Dec]Cleaning Shifts 清理牛棚 你有一段区间需要被覆盖（长度 include include include include include define LL long long define REP(i, x, y) for(int i = ( 阅读全文