随笔分类 - Codeforces
摘要：F. Gardening Friends Two friends, Alisa and Yuki, planted a tree with $n$ vertices in their garden. A tree is an undirected graph without cycles, loop
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摘要：G2. Magic Triples (Hard Version) This is the hard version of the problem. The only difference is that in this version, $a_i \le 10^9$. For a given seq
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摘要：C. Place for a Selfie The universe is a coordinate plane. There are $n$ space highways, each of which is a straight line $y=kx$ passing through the or
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摘要：D. A Wide, Wide Graph You are given a tree (a connected graph without cycles) with $n$ vertices. Consider a fixed integer $k$. Then, the graph $G_k$ i
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摘要：C. Candy Store The store sells $n$ types of candies with numbers from $1$ to $n$. One candy of type $i$ costs $b_i$ coins. In total, there are $a_i$ c
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摘要：D. Binary String Sorting You are given a binary string $s$ consisting of only characters 0 and/or 1. You can perform several operations on this string
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摘要：C. Sequence Master For some positive integer $m$, YunQian considers an array $q$ of $2m$ (possibly negative) integers good, if and only if for every p
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摘要：E. Music Festival The boy Vitya loves to listen to music very much. He knows that $n$ albums are due to be released this Friday, $i$-th of which conta
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摘要：C. The Very Beautiful Blanket Kirill wants to weave the very beautiful blanket consisting of $n \times m$ of the same size square patches of some colo
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摘要：C. Pull Your Luck While James is gone on business, Vesper takes her time and explores what the legendary Casino Royale has to offer to people who are
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摘要：A. Lame King You are given a checkerboard of size $201 \times 201$, i. e. it has $201$ rows and $201$ columns. The rows of this checkerboard are numbe
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摘要：D. Buying gifts Little Sasha has two friends, whom he wants to please with gifts on the Eighth of March. To do this, he went to the largest shopping c
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摘要：F. Dasha and Nightmares Dasha, an excellent student, is studying at the best mathematical lyceum in the country. Recently, a mysterious stranger broug
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摘要：D. Remove Two Letters Dmitry has a string $s$, consisting of lowercase Latin letters. Dmitry decided to remove two consecutive characters from the str
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摘要：D. Maximum Subarray You are given an array $a_1, a_2, \dots, a_n$, consisting of $n$ integers. You are also given two integers $k$ and $x$. You have t
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摘要：C. Maximum Set A set of positive integers $S$ is called beautiful if, for every two integers $x$ and $y$ from this set, either $x$ divides $y$ or $y$
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摘要：D. Serval and Shift-Shift-Shift Serval has two $n$-bit binary integer numbers $a$ and $b$. He wants to share those numbers with Toxel. Since Toxel lik
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摘要：D. Triangle Coloring You are given an undirected graph consisting of $n$ vertices and $n$ edges, where $n$ is divisible by $6$. Each edge has a weight
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摘要：D. Moscow Gorillas In winter, the inhabitants of the Moscow Zoo are very bored, in particular, it concerns gorillas. You decided to entertain them and
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摘要：B. Fedya and Array For his birthday recently Fedya was given an array $a$ of $n$ integers arranged in a circle, For each pair of neighboring numbers (
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