摘要：
F - Subsequence LCM Problem Statement You are given a sequence of positive integers $A=(A_1,A_2,\dots,A_N)$ of length $N$ and a positive integer $M$. 阅读全文
摘要：
H. The Most Reckless Defense You are playing a very popular Tower Defense game called "Runnerfield 2". In this game, the player sets up defensive towe 阅读全文
摘要：
G. GCD on a grid Not long ago, Egor learned about the Euclidean algorithm for finding the greatest common divisor of two numbers. The greatest common 阅读全文
摘要：
D. Colored Balls There are balls of $n$ different colors; the number of balls of the $i$-th color is $a_i$. The balls can be combined into groups. Eac 阅读全文
摘要：
D. Buying Jewels Alice has $n$ coins and wants to shop at Bob's jewelry store. Today, although Bob has not set up the store yet, Bob wants to make sur 阅读全文
摘要：
C. Ticket Hoarding As the CEO of a startup company, you want to reward each of your $k$ employees with a ticket to the upcoming concert. The tickets w 阅读全文
摘要：
F. New Year Tree You are a programmer and you have a New Year Tree (not the traditional fur tree, though) — a tree of four vertices: one vertex of deg 阅读全文
摘要：
F - Oddly Similar Problem Statement There are $N$ sequences of length $M$, denoted as $A_1, A_2, \ldots, A_N$. The $i$-th sequence is represented by $ 阅读全文
摘要：
D. Non-Palindromic Substring A string $t$ is said to be $k$-good if there exists at least one substring$^\dagger$ of length $k$ which is not a palindr 阅读全文