随笔分类 - Codeforces
摘要：G. Paint Charges A horizontal grid strip of $n$ cells is given. In the $i$-th cell, there is a paint charge of size $a_i$. This charge can be: either
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摘要：C. Did We Get Everything Covered? You are given two integers $n$ and $k$ along with a string $s$. Your task is to check whether all possible strings o
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摘要：D. Good Trip There are $n$ children in a class, $m$ pairs among them are friends. The $i$-th pair who are friends have a friendship value of $f_i$. Th
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摘要：D. Blocking Elements You are given an array of numbers $a_1, a_2, \ldots, a_n$. Your task is to block some elements of the array in order to minimize
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摘要：G. Mischievous Shooter Once the mischievous and wayward shooter named Shel found himself on a rectangular field of size $n \times m$, divided into uni
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摘要：F1. Smooth Sailing (Easy Version) The only difference between the two versions of this problem is the constraint on $q$. You can make hacks only if bo
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摘要：D. Array Repetition Jayden has an array $a$ which is initially empty. There are $n$ operations of two types he must perform in the given order. Jayden
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摘要：F. Sum of Progression You are given an array $a$ of $n$ numbers. There are also $q$ queries of the form $s, d, k$. For each query $q$, find the sum of
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摘要：E. Happy Life in University Egor and his friend Arseniy are finishing school this year and will soon enter university. And since they are very respons
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摘要：G. Bicycles All of Slavic's friends are planning to travel from the place where they live to a party using their bikes. And they all have a bike excep
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摘要：E2. Game with Marbles (Hard Version) The easy and hard versions of this problem differ only in the constraints on the number of test cases and $n$. In
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摘要：C. Heavy Intervals You have $n$ intervals $[l_1, r_1], [l_2, r_2], \dots, [l_n, r_n]$, such that $l_i < r_i$ for each $i$, and all the endpoints of th
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摘要：D. Yet Another Inversions Problem You are given a permutation $p_0, p_1, \ldots, p_{n-1}$ of odd integers from $1$ to $2n-1$ and a permutation $q_0, q
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摘要：G2. Light Bulbs (Hard Version) The easy and hard versions of this problem differ only in the constraints on $n$. In the hard version, the sum of value
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摘要：E. Physical Education Lessons This year Alex has finished school, and now he is a first-year student of Berland State University. For him it was a tot
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摘要：D. Array Collapse You are given an array $[p_1, p_2, \dots, p_n]$, where all elements are distinct. You can perform several (possibly zero) operations
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摘要：D. Cyclic MEX For an array $a$, define its cost as $\sum_{i=1}^{n} \operatorname{mex} ^\dagger ([a_1,a_2,\ldots,a_i])$. You are given a permutation$^\
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摘要：G. Lights In the end of the day, Anna needs to turn off the lights in the office. There are $n$ lights and $n$ light switches, but their operation sch
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摘要：E. Good Triples Given a non-negative integer number $n$ ($n \ge 0$). Let's say a triple of non-negative integers $(a, b, c)$ is good if $a + b + c = n
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摘要：D. Robot Queries There is an infinite $2$-dimensional grid. Initially, a robot stands in the point $(0, 0)$. The robot can execute four commands: U —
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