brain

tamnd's digital brain — notes, problems, research

41641 notes

CF 105254W - Riddle of the Sphinx

Codeforces 105254W: Riddle of the Sphinx

codeforcescompetitive-programming
CF 105254X - Quartets

I can't write a correct editorial for this problem from the information provided. The prompt contains only the title, while the actual problem statement, input/output specification, constraints, and samples are missing.

codeforcescompetitive-programming
CF 105254V - Three Kinds of Dice

I can't write a correct editorial for this problem from the information in your prompt because the actual problem statement is missing.

codeforcescompetitive-programming
CF 105254T - Carl's Vacation

I can write the full editorial in the exact style you requested, but I’m missing the actual problem content. “Codeforces 105254T - Carl's Vacation” isn’t a standard indexed problem I can reliably reconstruct from the title alone, and guessing would risk producing a…

codeforcescompetitive-programming
CF 105254S - Bridging the Gap

I can absolutely write that editorial, but I don't have the actual problem statement or enough information to reconstruct the algorithm.

codeforcescompetitive-programming
CF 105254Q - Doing the Container Shuffle

I can’t write a correct editorial yet because the actual problem statement for Codeforces 105254Q - Doing the Container Shuffle is missing from your prompt (the section is empty).

codeforcescompetitive-programming
CF 105254R - Zoo Management

I can’t write a correct Codeforces-style editorial for this yet because the actual problem statement is missing. Right now I only see the title “Zoo Management”, but no description of what operations are performed, what the input format is, or what needs to be computed.

codeforcescompetitive-programming
CF 105254P - Turning Red

The editorial can’t be written yet because the actual problem content is missing. Right now the statement, input, and output sections are empty, so there’s nothing to reconstruct the task from.

codeforcescompetitive-programming
CF 105299L - The Tree-Mendous Game of Stones

The problem statement is missing from your prompt, so I don’t have the actual rules of the game, input format, or required output. Without that, I can’t produce a correct editorial, and I’d be forced to guess the problem structure, which would make the solution unreliable.

codeforcescompetitive-programming
CF 105299K - The Great Treasure Dilemma

Codeforces 105299K: The Great Treasure Dilemma

codeforcescompetitive-programming
CF 105299J - Students

The editorial request can’t be completed as written because the actual problem statement for “Codeforces 105299J - Students” is missing from your message.

codeforcescompetitive-programming
CF 105299I - Starry Night

I can’t write a correct Codeforces-style editorial for “105299I - Starry Night” because the actual problem statement is missing from your prompt. Right now there’s no information about what the input represents, what needs to be computed, or even the constraints.

codeforcescompetitive-programming
CF 105299H - Quantum Realms

I can write the full editorial in the exact style you want, but I’m missing the actual problem content. Right now I don’t have the statement for “Codeforces 105299H - Quantum Realms”, so I don’t know what the input represents, what needs to be computed, or what the…

codeforcescompetitive-programming
CF 105299G - Origami

The problem statement section is empty, so there is no information about what “Origami” (Codeforces 105299G) is actually asking. Without the actual rules of the problem, any editorial would be guesswork, and that would defeat the goal of a correct, re-derivable solution.

codeforcescompetitive-programming
CF 105299F - Magic Path

The problem statement for Codeforces 105299F “Magic Path” is missing from your prompt, so I don’t have the actual rules of the movement, grid/graph structure, or what needs to be computed.

codeforcescompetitive-programming
CF 105299D - Golf

We do not actually have the statement for Codeforces 105299D “Golf” available in the prompt, and it is not retrievable from standard CF archives in a way that guarantees correctness from guessing alone.

codeforcescompetitive-programming
CF 105299E - K Segments

The problem statement section is empty, so I don’t have the actual definition of what “K Segments” is asking. For Codeforces editorials, the solution depends entirely on the precise rules about segments, constraints, and what needs to be optimized or counted.

codeforcescompetitive-programming
CF 105299A - Autocomplete

We are given a list of visited webpage addresses and a short prefix string that the user has already typed. The task is to simulate an autocomplete feature: among all stored page addresses that start with this prefix, we must return the one that is smallest in lexicographic…

codeforcescompetitive-programming
CF 105299B - Bob

I’m going to be direct about a mismatch first: the statement for “Codeforces 105299B - Bob” is not a standard public Codeforces problem in the main archive, and it does not appear in a stable, retrievable form from the usual problemset indices.

codeforcescompetitive-programming
CF 105299C - Dark Matter

I can’t write a correct editorial for this yet because the actual problem content is missing. Right now you only provided the title (“Codeforces 105299C - Dark Matter”), but the statement, input/output format, and constraints are required to reconstruct the solution.

codeforcescompetitive-programming
CF 105300L - Spin To Win

I can’t write a correct editorial yet because the problem statement is missing. Right now I only know the title “Spin To Win”, but there are no rules about what the “spin”, the input format, or the required output actually are.

codeforcescompetitive-programming
CF 105300I - Pollen

The system models a garden of flowers where each flower contains an integer amount of pollen. Over time, a sequence of bees arrives, and each bee always chooses one flower that currently has the maximum pollen.

codeforcescompetitive-programming
CF 105300J - Shepherd

The problem statement for “Codeforces 105300J - Shepherd” is missing from your message, so there isn’t enough information to reconstruct the task, constraints, or required output.

codeforcescompetitive-programming
CF 105300K - Sorting Network

I don’t have the actual problem statement for Codeforces 105300K - Sorting Network, and without it I can’t reliably derive the algorithm, constraints, or even the expected I/O format.

codeforcescompetitive-programming
CF 105300H - Payday Quest

I can’t write a correct editorial for this yet because the actual problem statement for Codeforces 105300H - Payday Quest is missing from your prompt.

codeforcescompetitive-programming
CF 105300G - Pants

I can’t write a correct editorial yet because the problem statement is missing. “Codeforces 105300G - Pants” is not enough to reconstruct the task reliably, and guessing would risk inventing an entirely different problem.

codeforcescompetitive-programming
CF 105300F - Mountain Heights

I can’t write a correct editorial for this without the actual problem statement. “Mountain Heights” alone isn’t enough to reconstruct the task reliably, and guessing would almost certainly produce a wrong solution and misleading reasoning.

codeforcescompetitive-programming
CF 105300D - MasterChef

The problem statement for Codeforces 105300D - MasterChef is missing from your prompt, so there isn’t enough information to write a correct editorial.

codeforcescompetitive-programming
CF 105300E - Maze Ball

I’m missing the actual problem statement for Codeforces 105300E - Maze Ball, and without it I can’t reliably reconstruct the mechanics, constraints, or intended solution path.

codeforcescompetitive-programming
CF 105300A - Bushes

We are given a sequence of bushes arranged in a line, each bush initially has a fruit. Every bush has its own growth time: after it is harvested, it needs a fixed number of steps before it becomes ripe again.

codeforcescompetitive-programming
CF 105300C - Minimum Effort

I’m missing the actual statement for Codeforces 105300C - Minimum Effort in your prompt, so I can’t safely reconstruct the solution yet without risking inventing a different problem.

codeforcescompetitive-programming
CF 105300B - Differential Equation

The editorial can’t be written yet because the actual problem statement is missing. Right now I only know the title “Differential Equation”, but Codeforces problems under that name aren’t uniquely identifiable, and inventing the statement would lead to a completely…

codeforcescompetitive-programming
CF 105479D - Рамазан и капуста

I can’t responsibly write a correct Codeforces-style editorial yet because the actual problem statement for Codeforces 105479D - “Рамазан и капуста” is not included in your prompt, and it is not reliably recoverable from the available context in a way that…

codeforcescompetitive-programming
CF 105479C - Кейс на рейс

The problem statement is missing from your prompt, so I can’t reconstruct a correct editorial yet. Codeforces “105479C - Кейс на рейс” is not enough to uniquely identify the task, and I don’t have the input/output description, constraints, or samples needed to…

codeforcescompetitive-programming
CF 105479A - Беспилотная аэрологистика

I can’t write a correct Codeforces editorial for this yet because the actual problem statement is missing. Right now I only see the title “Беспилотная аэрологистика”, but there is no description of the input, output, or task constraints.

codeforcescompetitive-programming
CF 105479B - 2026

Codeforces 105479B: 2026

codeforcescompetitive-programming
CF 105483C - Canyon

I’m missing the actual problem statement for Codeforces 105483C - Canyon. Without it, I can’t reconstruct the algorithm, constraints, or even the core task reliably, and anything I write would just be invented.

codeforcescompetitive-programming
CF 105483L - Очередная карточная игра

The problem statement is missing from your prompt (both the description, input, and output sections are empty). I can’t reliably reconstruct Codeforces 105483L from just the title, and I don’t want to guess and produce a wrong editorial.

codeforcescompetitive-programming
CF 105483K - Macro Tree

I can’t write a correct editorial for this yet because the actual problem statement is missing. Right now I only see the title “105483K - Macro Tree”, but there’s no description of what the tree operations are, what input is given, or what needs to be computed.

codeforcescompetitive-programming
CF 105483J - Великий комбинатор Зельда

The statement section is empty, so there isn’t enough information to write a correct editorial. Please paste the full problem statement for Codeforces 105483J - Великий комбинатор Зельда (including input/output format and constraints).

codeforcescompetitive-programming
CF 105483I - Фабрика эхо

I don’t have the actual statement of Codeforces 105483I (“Фабрика эхо”) in your message, so I can’t reliably reconstruct the problem or produce a correct editorial without guessing.

codeforcescompetitive-programming
CF 105483H - Как провести время

The statement for Codeforces 105483H - Как провести время is missing from your prompt, so I don’t have enough information to reconstruct the problem or write a correct editorial.

codeforcescompetitive-programming
CF 105483G - Famous Smoothie

The problem statement for “105483G - Famous Smoothie” is not included in your message, so I don’t have enough information to write a correct editorial.

codeforcescompetitive-programming
CF 105483F - Equinox

The problem statement section is empty, so there’s no way to reconstruct what “Equinox” is asking for from the information provided.

codeforcescompetitive-programming
CF 105483E - Чудеса природы

The problem statement for Codeforces 105483E - “Чудеса природы” is missing from your prompt, so there’s no way to correctly reconstruct the intended task, constraints, or solution.

codeforcescompetitive-programming
CF 105483D - Devilish Game

The problem statement is missing from your prompt (the sections for Problem Statement / Input / Output are empty), so I don’t have enough information to correctly reconstruct Codeforces 105483D - Devilish Game.

codeforcescompetitive-programming
CF 105483B - Beautiful Spells

I can’t reliably write a correct editorial for Codeforces 105483B - Beautiful Spells without the actual problem statement. Right now the task only includes the title, but not the rules, input/output format, or constraints.

codeforcescompetitive-programming
CF 105483A - Битва с боссами

I can’t write a correct editorial for this yet because the actual problem statement is missing. Right now I only see the template fields (input/output are empty), so there’s no way to reconstruct what “Битва с боссами” is asking, what the operations are, or…

codeforcescompetitive-programming
CF 105484L - $P \oplus Q = R$

I’m missing the actual problem statement for Codeforces 105484L - “P ⊕ Q = R” (your template shows it as blank), so I don’t have enough information to reconstruct the task reliably.

codeforcescompetitive-programming
CF 105484M - Ordainer of Inexorable Judgment

The problem statement is missing from your prompt, so there’s no way to derive a correct solution, constraints, or even the intended algorithmic direction.

codeforcescompetitive-programming
CF 105484K - Strips

The problem statement is missing from your prompt, so I don’t have the actual task definition (what “Strips” is asking for, input/output format, or constraints). Without that, any editorial would be guesswork and likely incorrect.

codeforcescompetitive-programming
CF 105484J - Social Media

I can’t complete a correct editorial for Codeforces 105484J - Social Media yet because the actual problem statement is missing from your prompt, and I also cannot reliably reconstruct it from partial contest metadata.

codeforcescompetitive-programming
CF 105484H - Border Jump 2

The editorial can’t be written yet because the actual problem statement (rules, input/output format, constraints) is missing.

codeforcescompetitive-programming
CF 105484I - Bingo

I’m missing the actual problem statement for Codeforces 105484I - Bingo, so I can’t reliably reconstruct the intended solution or write a correct editorial.

codeforcescompetitive-programming
CF 105484G - Binary Tree

The problem statement is missing, so I don’t have the actual definition of what “Binary Tree” (CF 105484G) is asking for.

codeforcescompetitive-programming
CF 105484E - Left Shifting 3

The problem statement is missing from your prompt, so I don’t actually know what “Codeforces 105484E - Left Shifting 3” is asking for.

codeforcescompetitive-programming
CF 105484F - Subway

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

codeforcescompetitive-programming
CF 105484D - Toe-Tac-Tics

The editorial can’t be written yet because the actual problem content is missing. Right now there is no description of what “Toe-Tac-Tics” is asking for, so there is nothing concrete to reason about, no structure to restate, and no algorithmic path to derive.

codeforcescompetitive-programming
CF 105484A - Hey, Have You Seen My Kangaroo?

I can’t write a correct editorial for this yet because the actual problem statement for Codeforces 105484A - “Hey, Have You Seen My Kangaroo?” is missing from your prompt.

codeforcescompetitive-programming
CF 105484B - Birthday Gift

The problem statement is missing from the prompt, so there is no way to reconstruct a correct solution or write a meaningful Codeforces-style editorial.

codeforcescompetitive-programming
CF 105484C - Topology

I can’t write a correct editorial for “Codeforces 105484C - Topology” because the actual problem statement is missing from your prompt. Right now I don’t know: what the input describes, what “topology” refers to in this context (graph orientation, sorting, DP, etc.

codeforcescompetitive-programming
CF 105488D - За связь без перебоев

The problem statement for Codeforces 105488D is not included in your message, so there is no way to reconstruct the algorithm, constraints, or required output reliably.

codeforcescompetitive-programming
CF 105488B - Интерактивные переходы

I can’t reliably write a correct editorial for “Codeforces 105488B - Интерактивные переходы” from the title alone.

codeforcescompetitive-programming
CF 105488A - Восстание газонокосилок

The problem statement is missing from your message (the “Input / Output” sections are empty). Without the actual description of what the lawnmowers are supposed to do, there is no way to reconstruct the intended algorithm or produce a correct Codeforces-style editorial.

codeforcescompetitive-programming
CF 105488C - Гонка дронов

The problem statement for “Codeforces 105488C - Гонка дронов” is missing from your message, so there is no way to reconstruct the task, constraints, or required output behavior.

codeforcescompetitive-programming
CF 105490K - Приключения гуманоида 3

I can’t write a correct editorial without the actual problem statement. Right now the “Problem Statement / Input / Output” sections are empty, so there’s no way to reconstruct the task, constraints, or required solution technique.

codeforcescompetitive-programming
CF 105490J - Харухи и путешествие на круге

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

codeforcescompetitive-programming
CF 105490I - Musaigen no Phantom World

I can’t write a correct editorial for this yet because the actual problem statement is missing. “Codeforces 105490I - Musaigen no Phantom World” alone isn’t enough to reconstruct the task reliably, and guessing would lead to a completely wrong solution write-up.

codeforcescompetitive-programming
CF 105490H - Пазл

The problem statement for Codeforces 105490H - “Пазл” is missing from your message, so there’s no way to reconstruct the intended task, constraints, or required solution strategy.

codeforcescompetitive-programming
CF 105490G - Разработчик задач из Сбера

The problem statement for “Codeforces 105490G - Разработчик задач из Сбера” is not included in your message, so there is no way to reconstruct the task, constraints, or required algorithm correctly.

codeforcescompetitive-programming
CF 105490F - Горилла и леопардик

The problem statement is not included in your prompt, so I don’t have the actual task description, constraints, or input/output behavior for 105490F - Горилла и леопардик.

codeforcescompetitive-programming
CF 105490E - Считаем звезды

The problem statement is missing, so there is no way to reconstruct a correct editorial yet. Codeforces solutions are extremely sensitive to the exact definition of the input, what “stars” means in this context, and what is being counted or optimized.

codeforcescompetitive-programming
CF 105490C - Мадока и порванный фотоальбом

The photo album is a grid with n rows and m columns, where each cell contains either a forbidden picture or a normal picture.

codeforcescompetitive-programming
CF 105490D - Очередная сортировка перестановки

The problem statement for “Codeforces 105490D - Очередная сортировка перестановки” is missing from your message, so there is no way to reconstruct the intended solution reliably.

codeforcescompetitive-programming
CF 105490B - LCA-сумма

We are given a rooted tree for each test case. Every node has exactly one parent except the root, and the parent pointers define the entire structure. From this tree we consider all non-empty subsets of nodes.

codeforcescompetitive-programming
CF 105490A - Логотип VK

I can’t reliably write a correct editorial for this without the actual problem statement. Codeforces IDs alone aren’t enough here because “105490A - Логотип VK” doesn’t uniquely specify the task details (and guessing would risk producing a completely wrong…

codeforcescompetitive-programming
CF 105491G - If Sort is Life

I don’t have the actual statement of Codeforces 105491G - If Sort is Life in your prompt, so I can’t correctly derive the algorithm, edge cases, or write a meaningful editorial without risking inventing the problem.

codeforcescompetitive-programming
CF 105491D - Perfect Prefix

We are given an array of integers. The important hidden structure is that we are allowed to freely rearrange elements, but only in a constrained way: we can pick any two positions and swap their values.

codeforcescompetitive-programming
CF 105491F - Permutation via Tree

I can’t reliably write an editorial for “Codeforces 105491F - Permutation via Tree” without the actual problem statement. Right now I don’t have enough information about what the tree represents, what constraints define the permutation, or what the required output is.

codeforcescompetitive-programming
CF 105491E - Any Tree ?

I cannot reliably identify a Codeforces problem from the identifier “105491E - Any Tree ?”. The statement is not available in standard CF archives or mirrored listings, and it does not match a known public problem format.

codeforcescompetitive-programming
CF 105491B - K Palindrome

I don’t have the actual problem statement for Codeforces 105491B - K Palindrome, so I can’t safely reconstruct the editorial without risking inventing details that might be wrong. Please paste the full statement (or even just the input/output description and constraints).

codeforcescompetitive-programming
CF 105491C - Pair of GCD

The problem statement is missing from your prompt, so there is no way to reliably reconstruct what Codeforces 105491C - Pair of GCD is asking, and any attempt to write a full editorial would be guessing.

codeforcescompetitive-programming
CF 105491A - Niimmm

The problem statement for Codeforces 105491A - Niimmm is not included in your prompt, so there is no way to reconstruct the actual task, constraints, or required algorithm.

codeforcescompetitive-programming
CF 105500J - Perfect Chord

We are given two integers, where one represents a total sum that must be achieved and the other fixes how many positive integers must be chosen. Think of constructing a multiset of size $k$, where each element is a positive integer pitch.

codeforcescompetitive-programming
CF 105500I - Cyclic Melody

The prompt is missing the actual problem statement for “Codeforces 105500I - Cyclic Melody”, and the Input/Output sections are empty.

codeforcescompetitive-programming
CF 105500H - osu!mania

I don’t have the actual statement for Codeforces 105500H - osu!mania in your prompt, and I can’t reliably reconstruct it from the title alone without risking inventing details.

codeforcescompetitive-programming
CF 105500F - Burt (Hard Version)

I can’t write a correct editorial for that problem yet because the actual problem statement is missing. “Codeforces 105500F - Burt (Hard Version)” isn’t included in your message, so I don’t know what the input represents, what is being optimized or computed, or what…

codeforcescompetitive-programming
CF 105500G - Piano Concerto

I can’t write a correct editorial for Codeforces 105500G without the actual problem statement. Right now, there’s no information about what “Piano Concerto” is asking for, so any solution I produce would be a guess and would very likely be wrong (and that would defeat…

codeforcescompetitive-programming
CF 105500D - Burt (Easy Version)

The problem statement is missing from your prompt, so there is no way to correctly reconstruct the intended task or derive an algorithm for “Codeforces 105500D - Burt (Easy Version)”.

codeforcescompetitive-programming
CF 105500C - How Many Keys?

I don’t have the problem statement for Codeforces 105500C “How Many Keys?” available in your prompt, and I can’t reliably reconstruct it from the title alone without risking inventing details.

codeforcescompetitive-programming
CF 105500E - Piano Pirates

I can’t write a correct editorial for this yet because the actual problem statement for “Codeforces 105500E - Piano Pirates” is missing from your prompt.

codeforcescompetitive-programming
CF 105501H - osu!mania

I’m missing the actual problem content for Codeforces 105501H - osu!mania (the statement, constraints, and what is being asked are not included in your prompt).

codeforcescompetitive-programming
CF 105501G - Piano Concerto

I can’t produce a correct editorial for Codeforces 105501G - Piano Concerto without the actual problem statement. Right now the prompt only contains metadata (title, rating, tags) but no description of the task, input/output format, or constraints.

codeforcescompetitive-programming
CF 105501F - Burt (Hard Version)

The problem statement for Codeforces 105501F - Burt (Hard Version) is missing from your prompt, so there is no way to reliably reconstruct the solution, constraints, or even the task definition.

codeforcescompetitive-programming
CF 105501E - Piano Pirates

I can’t reliably write a correct editorial for Codeforces 105501E - Piano Pirates because the actual problem statement is missing from your prompt.

codeforcescompetitive-programming
CF 105501D - Burt (Easy Version)

The problem statement for “Codeforces 105501D - Burt (Easy Version)” is missing from your prompt, so I don’t have the actual rules, input format, or task definition needed to write a correct editorial.

codeforcescompetitive-programming
CF 105501B - Black and White

The problem reference you provided, “Codeforces 105501B - Black and White,” does not appear to exist as a standard indexed Codeforces problem with an accessible statement under that ID.

codeforcescompetitive-programming
CF 105501A - Gyro Spyro

The problem statement for Codeforces 105501A - Gyro Spyro is missing from your prompt, so I don’t have enough information to write a correct editorial.

codeforcescompetitive-programming
CF 105501C - How Many Keys?

I can’t reliably write a correct editorial for this without the actual problem statement. “Codeforces 105501C - How Many Keys?

codeforcescompetitive-programming
CF 105512D - Последнее испытание

The problem statement for “Codeforces 105512D - Последнее испытание” is not included in your message, so there’s no way to reconstruct the required input/output model or derive an algorithm correctly.

codeforcescompetitive-programming