ATarc181a [ARC181A] Sort Left and Right 贪心 排序 分类讨论 普及/提高-
ATarc181b [ARC181B] Annoying String Problem 哈希 hashing KMP 算法 普及+/提高
ATarc181c [ARC181C] Row and Column Order 构造 Ad-hoc 普及+/提高
ATarc181d [ARC181D] Prefix Bubble Sort 线段树 提高+/省选-
ATarc181e [ARC181E] Min and Max at the edge 线段树 生成树 Ad-hoc NOI/NOI+/CTSC
ATarc181f [ARC181F] Colorful Reversi 动态规划 DP NOI/NOI+/CTSC