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摘要： String Transformation You are given two strings s and t of equal length n. You can perform the following operation on the string s: Remove a suffix of 阅读全文

摘要： F. Selling a Menagerie You are the owner of a menagerie consisting of $n$ animals numbered from $1$ to $n$. However, maintaining the menagerie is quit 阅读全文

摘要： 整理书籍 书架上有若干本书排成一排。 每本书要么是大型书（用 L 表示），要么是中型书（用 M 表示），要么是小型书（用 S 表示）。 我们希望所有书能够从大到小有序排列，也就是说，所有大型书都在左侧，所有中型书都在中间，所有小型书都在右侧。 为此，你可以进行任意次交换操作，每次可以任选两本书并交换 阅读全文

摘要： D. Balanced String You are given a binary string $s$ (a binary string is a string consisting of characters 0 and/or 1). Let's call a binary string bal 阅读全文

摘要： F1. Omsk Metro (simple version) This is the simple version of the problem. The only difference between the simple and hard versions is that in this ve 阅读全文

摘要： Minimum Edge Weight Equilibrium Queries in a Tree There is an undirected tree with n nodes labeled from 0 to n - 1. You are given the integer n and a 阅读全文

摘要： D. Sorting By Multiplication You are given an array $a$ of length $n$, consisting of positive integers. You can perform the following operation on thi 阅读全文

摘要： C. Vika and Price Tags Vika came to her favorite cosmetics store "Golden Pear". She noticed that the prices of $n$ items have changed since her last v 阅读全文

摘要： D. Imbalanced Arrays Ntarsis has come up with an array $a$ of $n$ non-negative integers. Call an array $b$ of $n$ integers imbalanced if it satisfies 阅读全文

摘要： C. MEX Repetition You are given an array $a_1,a_2,\ldots, a_n$ of pairwise distinct integers from $0$ to $n$. Consider the following operation: consec 阅读全文