brain

We are given a binary string, and we are allowed to repeatedly apply an operation that reverses a chosen substring. The key restriction is that the substring we choose must contain exactly $k$ ones at the moment we apply the operation.

I can’t complete this editorial correctly yet because the actual statement of Codeforces 105512A - “Производство автомобилей” is missing, and the name alone is not enough to reconstruct the task reliably.

I’m missing the actual problem statement for Codeforces 105512C - “Балет” (the section is empty in your prompt), so I can’t reliably reconstruct the task or derive a correct solution.

I can’t reliably write a correct editorial yet because the actual statement of Codeforces 105513D - “Мега OR” is missing from your prompt, and it is not recoverable from the available context.

I can’t reliably reconstruct Codeforces 105513C (“Ресторанный бизнес”) from the identifier alone, and without the actual statement any editorial would risk inventing rules, which would defeat the purpose of a correct solution write-up.

I can’t write a correct editorial for this yet because the actual problem statement for Codeforces 105513B - “История о ферматисте” is missing from your prompt.

I’m missing the actual problem statement for Codeforces 105513A (“Поддержание бодрости”), so I can’t responsibly write a correct editorial yet.

I don’t have the actual statement for Codeforces 105514D “Системы счисления” in your prompt, so I can’t reconstruct the problem reliably or write a correct editorial without risking hallucination.

I can’t reliably reconstruct Codeforces 105514A (“Доски”) from available references, and I don’t want to hallucinate a solution for a problem whose statement is missing or ambiguous. The editorial would be meaningless if the underlying task is wrong.

I’m missing the actual problem statement for Codeforces 105514C - “Тортики и свечки”, so I can’t safely derive the solution or write a correct editorial yet.

I’m missing the actual problem statement for Codeforces 105514B (“Счастливые числа”), and without it I can’t reliably reconstruct the task, constraints, or the intended solution path.

I can’t write a correct Codeforces-style editorial for this yet because the actual problem statement is missing.

The problem statement is missing from your prompt, so there’s no way to reconstruct the intended solution, constraints, or even the core task for Codeforces 105515B.

The editorial request cannot be completed as written because the actual problem statement for Codeforces 105515C - “Эффективные ветрогенераторы” is missing from the prompt.

The problem statement is missing from your prompt, so I don’t have the actual task definition for Codeforces 105515A.

I don’t have the actual statement for Codeforces 1055164 - “Оптимальные тарифы” in your prompt, so I can’t reliably reconstruct the problem or produce a correct editorial.

I can’t write a correct editorial yet because the actual problem statement is missing. Right now I only see the title (“Башня из кубиков”), but no description of: - what the input represents, - what operations or constraints exist, - what must be computed.

I don’t have the actual statement of “Кодовый замок” (Codeforces 1055161) in your prompt, so I can’t reliably reconstruct the problem, constraints, or examples needed to write a correct editorial.

I’m missing the actual problem statement for Codeforces 1055163 - “Высокие горы”, so I can’t reliably reconstruct the task or derive a correct solution.

I’m missing the actual problem statement for “Квадратный торт” (Codeforces 1055174), so I can’t reliably reconstruct the logic or write a correct editorial without guessing.

The problem statement is missing from your prompt, so there is no way to reconstruct what “Блокчейн (Blockchain)” is asking for or derive a correct algorithm. A Codeforces editorial depends entirely on the exact operations, constraints, and output rules.

The problem statement is missing from your prompt, so I don’t have enough information to write a correct editorial.

The problem statement section is empty, so there’s no information about what “Поход в магазин” actually asks. Right now I don’t know: what the input represents, what needs to be computed, or what constraints we are working under.

The problem statement is missing, so there’s nothing concrete to derive a correct algorithm from. Right now I only see the title “Переезд в Долгопрудный”, but no description of the task, inputs, or outputs.

The problem statement is not included in your message, so I don’t have the definition of the input format, output requirements, or even what exactly “Площадь прямоугольника” refers to in this specific task instance.

The problem statement is missing from your prompt, so there isn’t enough information to reconstruct the task reliably.

I can’t reliably write a correct Codeforces-style editorial for “1055183 - Нейросеть” without the actual problem statement.

The problem statement for “Codeforces 1055194 - Виртуоз гитары” is not included in your message, so I don’t have the actual task definition, constraints, or input/output format needed to write a correct editorial.

The problem statement for “Codeforces 1055191 - Лифты (Elevators)” is not included in your prompt, so there isn’t enough information to reconstruct the task reliably.

The problem statement is missing from your prompt, so I can’t reliably reconstruct what “Codeforces 1055192 - Торговля” is asking.

I can’t reliably write a correct Codeforces-style editorial here because the actual problem statement is missing.

I can’t reliably produce an editorial for Codeforces 105520D - “Тетрадка” because the actual problem statement is missing from your prompt, and it is not included in the standard archive context I can access here.

I can’t write a correct editorial for this yet because the actual problem statement is missing. Right now you only provided the title (“Хоровод”), but there is no description of: what the input represents, what transformations or operations are allowed, or what…

The problem statement is missing from your prompt, so I can’t reliably reconstruct the task or produce a correct editorial. Please paste the full statement (input/output description and constraints if available).

The problem statement is not included in your prompt (the sections for input/output are empty). Without the actual description of Codeforces 105520B - “Телефон”, it is impossible to produce a correct editorial, because the entire solution structure depends on what is…

I can’t reliably write a correct editorial without the actual problem statement for Codeforces 105521D - “Шоу с дельфинами”.

I can’t write the editorial yet because the actual problem statement for Codeforces 105521A - “Новые книги” is not available in your prompt, and it is not reliably retrievable from the context I currently have.

The problem statement is missing from your prompt, so I don’t have the actual task definition (what “Мыт на реке Яуза” is asking to compute, what the inputs are, or what needs to be output).

I can’t write a correct editorial yet because the actual problem statement is missing. “Codeforces 105521C - Поиск сокровищ” only gives the title, but there’s no information about the input format, constraints, or what the algorithm is supposed to compute.

The problem statement isn’t included in your message, so I don’t have enough information to write a correct editorial for Codeforces 105522D.

The problem statement is missing from the prompt, so I don’t have the actual rules, input format, or what is being asked for in Codeforces 105522B “Монетки”.

I can’t reliably write a correct editorial for Codeforces 105522C “Пирамида” from just the contest ID and name.

The problem statement for Codeforces 105522A - Игрушечный небоскрёб is missing from your prompt, so I don’t have the actual task definition (input format, output requirements, or constraints).

I cannot locate a reliable statement for Codeforces 105523D - “Доски” in the accessible archive data, and the mirror pages do not contain a consistent problem description. Without the actual task statement, any editorial would risk being about the wrong problem.

The problem statement section is empty, so there isn’t enough information to write a correct editorial yet. For a Codeforces editorial, the exact task definition is essential because the solution approach, constraints, and edge cases all depend on what…

I can’t reliably write a correct editorial for Codeforces 105523C - “Гипотеза Коллатца” because the actual problem statement (what is being computed, constraints, input/output format) is missing from your prompt.

The problem statement is missing from your prompt, so there’s no way to correctly derive the solution, constraints, or examples for “Codeforces 105523B - Марсоход Феникс”.

The problem statement didn’t come through, so there’s no way to reconstruct the task reliably. Codeforces problems can vary wildly under the same format, and “105524D - Паутина” alone isn’t enough to determine whether this is a graph problem, combinatorics…

We are given a scenario involving two halves of a collection of bags, where each bag contains a large number of coins. From each bag, a structured sample is taken: from the first bag we take 1 coin, from the second 2 coins, and so on.

The problem statement is missing from your prompt, so there’s no way to reconstruct the task, constraints, or required algorithm safely.

The problem statement section is empty, so there isn’t enough information to reconstruct what “Codeforces 105524C - Предприниматель Дмитрий” is actually asking.

The problem statement for “Codeforces 1055254 - Вредоносные подстроки” is missing from your message, so I don’t have the actual task definition, input format, or required output.

The problem statement is missing from the prompt, so there is not enough information to write a correct editorial.

The problem statement is missing from your prompt, so there is no way to reconstruct the task (inputs, outputs, or constraints) or write a correct Codeforces-style editorial for it.

The problem statement is missing from your prompt (it’s empty under “Problem Statement / Input / Output”), so there’s no way to reconstruct what “Codeforces 1055253 - Детектив Пикачу” is asking or derive a correct algorithm.

I don’t have the actual problem statement for “Codeforces 1055264 - Спиннер”, and without it I’d be forced to guess the rules of the task, which would make the editorial meaningless or outright wrong.

We are given a forecast of daily average temperatures for a sequence of days. The heating system in the story has a very specific activation rule: it turns on the first day when there exists a stretch of five consecutive days whose temperatures are all at most +8°C.

I can’t write a correct editorial for this yet because the actual problem statement is missing from your prompt. “Codeforces 1055261 - Простая задача” is not enough on its own, and there are multiple problems that could share similar metadata.

I’m missing the actual problem content for “Codeforces 1055262 - Блокчейн”. Right now the statement sections (Problem/Input/Output) are empty, so there’s no way to reconstruct the task reliably without guessing.

The prompt is missing the actual problem statement for Codeforces 1055274 - “Инопланетная система счисления”, so there isn’t enough information to write a correct editorial.

I can’t reliably write a correct editorial for this because the actual problem statement is missing. Right now I only see the title “Односторонний <<Морской бой”, but no description of the rules, input format, or what is being asked.

The problem section is empty, so there is no description of what “Площадь прямоугольника” is asking for in this specific Codeforces context, and I don’t have enough information to reconstruct the intended task reliably.

I can write the full Codeforces-style editorial, but the problem statement is missing from your prompt. “Codeforces 1055272 - Добби и носки” isn’t enough on its own to reconstruct the task reliably, and guessing would risk producing a completely incorrect…

I can’t produce a correct editorial for “Codeforces 1055284 - Торговля” because the actual problem statement (what is being traded, what inputs mean, and what is required) is missing.

I’m missing the actual problem statement, and that makes it impossible to write a correct Codeforces-style editorial without guessing.

The problem statement is missing, so there isn’t enough information to produce a correct editorial. For a Codeforces editorial, the exact mechanics of the task (what the lifts do, what queries are asked, constraints, and required output behavior) completely determine the…

The problem statement for “Codeforces 1055282 - Бассейн” isn’t included in your message, so I can’t reliably reconstruct the task or produce a correct editorial without risking inventing details.

I can’t write a correct editorial for this problem yet because the actual problem statement (what the input/output describe and what needs to be computed) is missing.

The problem statement for Codeforces 105532K - The New Imperial Workout Plan is missing from your prompt, so there is no way to correctly derive the solution, constraints, or edge cases.

I can write the full editorial, but I’m missing the actual problem statement for Codeforces 105532J - Power-up Maze.

I can’t write a correct editorial for this yet because the actual problem content (statement, input/output format, constraints) is missing from what you provided.

The problem statement is missing from the prompt, so I don’t have enough information to write a correct editorial for “Fours Redux”.

I can’t write a correct editorial for this yet because the actual problem statement is missing. Right now I don’t know what “The Picky Ewok” is asking (input format, constraints, or even the task type), so any solution would be guesswork and very likely wrong.

The task revolves around comparing a fixed reference string with multiple candidate strings and checking whether each candidate can be obtained by deleting some characters from the reference without rearranging the remaining ones.

The problem statement for “Codeforces 105532F - Droid Foundry B (Hard Version)” is not included in your prompt, so there is no way to correctly derive the algorithm, constraints, or implementation details needed for a valid editorial.

I’m missing the actual problem content for “Codeforces 105532D - Jar Jar Thinks”. Right now the statement sections are empty, so I don’t have the definitions of the input, output, or the core task.

I can’t complete the editorial yet because the actual statement of Codeforces 105532A - Force Jumping is missing from your prompt, and this specific problem ID does not correspond to a standard public CF problem with a reliably accessible statement in context.

I cannot reliably write a correct Codeforces editorial for 105532B - VADA X without the actual problem statement. The material available in the prompt only gives the problem code and title, but no description of the task, input format, or constraints.

I don’t have the actual statement for Codeforces 105532C - “Who Shot First?” in your prompt, and I can’t reliably reconstruct it from the title alone without risking inventing details.

We are given two strings, and we want to determine the length of the longest contiguous segment that appears in both strings. A contiguous segment here means a substring, so characters must match in order and without gaps.

The problem describes a two-player impartial game played on several piles of objects. Players alternate moves, and on each move a player selects a single pile and removes at least one object from it.

I can’t write a correct editorial for this yet because the actual problem statement for 105537K - Keyboard Chaos is missing from your prompt. Right now I don’t know: - what the input represents (strings, arrays, graph, etc.

The prompt is missing the actual problem statement for Codeforces 105537J - Just Half is Enough, so there isn’t enough information to derive the solution, constraints, or algorithm.

We are given two sequences of mountain heights of the same length. One represents the current landscape, the other represents an earlier state. The landscape evolves over discrete years.

I can’t produce a correct Codeforces editorial from that reference alone because “105537H - Hanoi Towers Reloaded” doesn’t include the actual problem statement, and there are multiple possible variants of Hanoi-style problems (move counting, forbidden states, k-pegs…

I can’t reliably write a correct editorial for “Codeforces 105537F - False Alarm” because the actual problem statement is missing from your prompt.

We are given a very large one dimensional board that extends infinitely to the right. On some of its cells, there are stacks of red and blue chips. Red chips belong to the first player, blue chips belong to the second player.

The problem statement section is empty, so there isn’t enough information to write a correct editorial. For a Codeforces editorial, I need at least the actual task description (what the input grid/graph represents, what counts as an “eight-shaped figure”, and what we are…

We are given a circular network of servers, each holding a non-negative load. The system provides an operation that is supposed to reduce load locally, but it is slightly broken: when applied to a server, it reduces that server by two units and also reduces its previous…

We are given a sequence of bricks placed in a line. Each brick has a width of one unit and a certain height. We also have a fixed row width, meaning we can place only a limited number of bricks side by side in a single row.

The problem statement section is empty, so there’s no information about what “Brick in the Wall, Part 2” actually asks.

We are given a convex polygon with $n$ vertices arranged in order, forming the boundary of a “cake.” Each vertex must be assigned one of $k$ colors.

I can’t write a correct editorial for this yet because the actual problem statement for Codeforces 105540M - Judgement is missing from your prompt.

I can’t write a correct editorial for Codeforces 105540L - The Tower because the problem statement is not included in your prompt.

We are given a set of points in 3D space, where each point represents a plant located at integer coordinates. For any plant, we look at how many other plants share its x-coordinate, how many share its y-coordinate, and how many share its z-coordinate.

I don’t have the actual problem statement for Codeforces 105540K - The Devil in your prompt (the “Problem Statement / Input / Output” sections are empty), so I can’t correctly reconstruct the task or derive a valid solution.

I cannot reliably reconstruct the full statement of Codeforces 105540H - Strength from available references, and I should not fabricate a solution.

The problem statement is missing from the prompt, so I can’t reconstruct what “The Hanged Man (Codeforces 105540I)” is asking for. Without the actual rules, inputs, and outputs, any editorial would be guesswork and likely wrong.

The problem statement for Codeforces 105540G - The Wheel of Fortune is not included in your message, so there is not enough information to write a correct or meaningful editorial.

The problem is a probabilistic process on three competing populations. You start with a fixed number of rocks, scissors, and papers. Over time, pairs of individuals are chosen uniformly at random from all remaining individuals.