CF1451D-Circle Game 题目: 题目描述: Utkarsh is forced to play yet another one of Ashish’s games. The game progresses turn by turn and as usual, Ashish moves first. Consider the 2D plane. There is a token which is initially at $ (0,0) $ . In one move a player must increase either the $ x $ coordinate or the $ y $ coordinate of the

CF1451C-String Equality 题目: 题目描述: Ashish has two strings $ a $ and $ b $ , each of length $ n $ , and an integer $ k $ . The strings only contain lowercase English letters. He wants to convert string $ a $ into string $ b $ by performing some (possibly zero) operations on $ a $ . In one move,

CF1451B-Non-Substring Subsequence 题目: 题目描述: Hr0d1y has $ q $ queries on a binary string $ s $ of length $ n $ . A binary string is a string containing only characters ‘0’ and ‘1’. A query is described by a pair of integers $ l_i $ , $ r_i $ $ (1 \leq l_i \lt r_i \leq n) $ . For each query,

CF1451A-Subtract or Divide 题目: 题目描述: Ridbit starts with an integer $ n $ . In one move, he can perform one of the following operations: divide $ n $ by one of its proper divisors, or subtract $ 1 $ from $ n $ if $ n $ is greater than $ 1 $ . A proper divisor is a divisor of a number,

P5338-[TJOI2019]甲苯先生的滚榜 题目: 题目描述: 甲苯先生在制作一个 Online Judge，他发现做比赛的人们很关心自己的排名（显而易见）

P4559-[JSOI2018]列队 题目: 题目描述: 作为一名大学生，九条可怜在去年参加了她人生中的最后一次军训。 军训中的一个重要项目是练习列