brain

tamnd's digital brain — notes, problems, research

43815 notes

慢 (màn) — slow

HSK 1 | adjective, adverb | slow, slowly

hsk-1vocabularya1
控制 (kòngzhì) — to control; to manage; control

HSK 4 | verb / noun | regulating or restraining something within bounds

hsk-4vocabularyb1
土 — Kanji Reference

土 (earth, soil): 3 strokes, JLPT N5. On: ド、ト. Kun: つち.

japanesekanjin5writing
规范 (guīfàn) — norm, standard; to standardize

HSK 6 | n/v | established standard or norm; to bring into conformity with a standard

hsk-6vocabularyc1
研究 (yánjiū) — to research; research

HSK 3 | verb/noun | systematic investigation or study of a subject

hsk-3vocabularya2
承载 (chéngzài) — to carry, to bear

HSK 6 | verb | to bear the weight of; to carry (physical load or abstract meaning/responsibility)

hsk-6vocabularyc1
活动 (huódòng) — activity; event

HSK 3 | noun/verb | an activity, event, or to move around

hsk-3vocabularya2
N4 Kanji: 便 (Convenient, Mail)

JLPT N4 kanji 便 — readings, vocabulary, stroke order, mnemonic, and common confusion pairs.

japanesen4jlptkanjilanguage-learning
食谱 (shípǔ) — recipe

HSK 4 | noun | a set of instructions for preparing a dish

hsk-4vocabularyb1
〜につれて — JLPT N2 Grammar

Learn how to use 〜につれて (ni tsurete) to express parallel change — 'as ~ happens, ~ also changes.' Includes structure, nuance, examples, and comparisons.

japanesegrammarn2jlpt
此外 (cǐwài) — in addition; besides; moreover

HSK 4 | conjunction | introducing an additional point beyond what was stated

hsk-4vocabularyb1
镜子 (jìngzi) — mirror

HSK 3 | noun | a mirror; a reflective surface used to see one's reflection

hsk-3vocabularya2
だから (だから) — Japanese Vocabulary

だから (だから / dakara): therefore, so. N4 level Japanese vocabulary.

japanesevocabularyn4conj
机遇 (jīyù) — opportunity / chance

HSK 4 | noun | opportunity; favorable chance

hsk-4vocabularyb1
CF 470E - Chessboard

We need to print an n × n chessboard using characters. White squares are represented by . and black squares by . The square in the top-left corner is white, and colors alternate both horizontally and vertically exactly as on a real chessboard.

codeforcescompetitive-programming*special
夜 — JLPT N5 Kanji

夜 (ya/yoru): night. JLPT N5 kanji.

japanesekanjin5jlpt
复杂化 (fùzáhuà) — to complicate; to become complicated

HSK 5 | verb | to complicate, to make more complex, to become complicated

hsk-5vocabularyb2
公司 (gōngsī) — company

HSK 1 | noun | company, corporation, firm

hsk-1vocabularya1
〜わけではない — JLPT N3 Grammar

Learn 〜わけではない (it doesn't mean that ~, it's not that ~) — the N3 partial negation pattern for correcting over-generalizations and assumptions.

japanesegrammarn3jlpt
語 — Kanji Reference

語 (language, word): 14 strokes, JLPT N5. On: ゴ. Kun: かた-る、かた-らう.

japanesekanjin5writing
JLPT N4 Lesson 3: Giving and Receiving

Master Japanese giving and receiving verbs — あげる, もらう, くれる — and their て-form benefactive extensions 〜てあげる, 〜てもらう, 〜てくれる. Learn the in-group/out-group (uchi/soto) social rules that govern their use.

japanesen4jlptlessonlanguage-learning
画 (huà) — to draw, to paint; a painting

HSK 2 | verb / noun | to draw or paint; a picture or painting

hsk-2vocabularya1
利益 (lìyì) — interest, benefit, profit

HSK 5 | noun | an advantage, gain, or benefit that serves one's goals or welfare

hsk-5vocabularyb2
彻底 (chèdǐ) — thorough; completely; thoroughly

HSK 5 | adjective/adverb | going all the way; leaving nothing incomplete

hsk-5vocabularyb2
爱好 (àihào) — hobby; interest

HSK 3 | noun/verb | hobby or personal interest

hsk-3vocabularya2
记录 (jìlù) — to record; record; to document

HSK 4 | verb/noun | to write down or keep a record of something

hsk-4vocabularyb1
影响力 (yǐngxiǎng lì) — influence; clout; power of influence

HSK 5 | noun | the capacity or power to have an effect on others' behavior or thinking

hsk-5vocabularyb2
CF 469B - Chat Online

We are asked to count how many different moments in time Little X can wake up such that he overlaps with Little Z online. Little Z has a fixed schedule consisting of multiple segments.

codeforcescompetitive-programmingimplementation
建议 (jiànyì) — to suggest; suggestion; recommendation

HSK 4 | verb/noun | to propose a course of action; a recommendation offered to others

hsk-4vocabularyb1
〜てもらう — Japanese Grammar

〜てもらう: JLPT N4 grammar pattern. Usage, structure, examples, and comparison with similar patterns.

japanesegrammarn4receiving
CF 470G - Hamming Distance

The task is to compute the Hamming distance between two strings of equal length. In practical terms, you are comparing two sequences of letters and counting how many positions contain different characters. Each mismatch contributes exactly one to the distance.

codeforcescompetitive-programming*special
乃至 (nǎizhì) — even, and even

HSK 6 | conj | used to extend a range to include an extreme or unexpected member

hsk-6vocabularyc1
幸福 (xìngfú) — happiness; happy; blessed

HSK 3 | noun/adjective | a deep sense of contentment and well-being

hsk-3vocabularya2
川 — Kanji Reference

川 (river): 3 strokes, JLPT N5. On: セン. Kun: かわ.

japanesekanjin5writing
诠释 (quánshì) — to interpret; to explain

HSK 5 | verb / noun | to give a full explanation or interpretation of something

hsk-5vocabularyb2
情绪 (qíngxù) — mood; emotion; sentiment

HSK 4 | noun | a person's current emotional state or feeling

hsk-4vocabularyb1
床 (chuáng) — bed

HSK 1 | noun | bed

hsk-1vocabularya1
通报 (tōngbào) — to notify; to brief; to inform

HSK 4 | verb/noun | an official notification or briefing

hsk-4vocabularyb1
汇报 (huìbào) — Report, give a report

HSK 5 | verb/noun | to report to a superior; a formal report or briefing

hsk-5vocabularyb2
才 (cái) — not until; only then

HSK 1 | adverb | indicates that something happens later or with more difficulty than expected

hsk-1vocabularya1
相反 (xiāngfǎn) — opposite; on the contrary

HSK 5 | adjective/adverb | expressing the idea of being contrary or the reverse

hsk-5vocabularyb2
体现 (tǐxiàn) — embodiment; to embody

HSK 6 | n/v | concrete manifestation; to give concrete expression to an abstract quality

hsk-6vocabularyc1
Lesson 1: Formal Written Chinese

Master formal written Chinese grammar patterns and register-appropriate vocabulary for academic and professional contexts.

hsk-5lessonb2
自己 (zìjǐ) — oneself; self

HSK 3 | pronoun | referring to the subject themselves

hsk-3vocabularya2
Lesson 17: City Life

Discuss urban living, infrastructure, and city development using 在 + city + 生活/工作 and city vocabulary at B1 level.

hsk-4lessonb1
东西 (dōngxi) — thing / stuff

HSK 1 | noun | things, stuff (idiomatic); east-west (literal)

hsk-1vocabularya1
Lesson 3: Simultaneous Interpretation Practice

Develop professional-level simultaneous and consecutive interpretation skills between Esperanto and national languages at congresses and formal events.

esperantoc2lesson
〜次第 — JLPT N3 Grammar

Master both meanings of 〜次第: 'as soon as ~' (formal temporal) and 'depends on ~' (conditional) — essential for N3 business communication.

japanesegrammarn3jlpt
書 — JLPT N5 Kanji

書 (sho/ka-ku): write. JLPT N5 kanji.

japanesekanjin5jlpt
邮局 (yóujú) — post office

HSK 3 | noun | the post office; a government postal service location

hsk-3vocabularya2
扩大 (kuòdà) — to expand; to enlarge; to extend

HSK 4 | verb | to make something larger in scope or size

hsk-4vocabularyb1
Lesson 13: Prepositions

All Sindarin prepositions with their mutation triggers: soft, nasal, and mixed — with worked examples and the dative/genitive constructions.

sindaringrammarprepositionsintermediate
提出 (tíchū) — to propose; to put forward; to raise

HSK 4 | verb | to bring up an idea, question, or suggestion for consideration

hsk-4vocabularyb1
〜をもって — JLPT N1 Grammar

N1 grammar pattern 〜をもって: expressing means or instrument (by means of, with), or a temporal boundary (as of, with this).

japanesegrammarn1jlpt
期间 (qījiān) — period; duration; during

HSK 4 | noun | a span of time or a period during which something occurs

hsk-4vocabularyb1
Lesson 7: Law & Politics

Master the vocabulary and grammar of Chinese legal and political discourse, enabling engagement with official documents, legal texts, and political commentary.

hsk-5lessonb2
问责制 (wènzézhì) — accountability system

HSK 5 | noun | an institutional system that holds officials or organisations responsible for their conduct

hsk-5vocabularyb2
〜まで — Until; As Far As
japanesegrammarn5particles
谢谢 (xièxiè) — thank you

HSK 1 | greeting phrase | expresses gratitude

hsk-1vocabularya1
继续 (jìxù) — to continue

HSK 3 | verb | to continue or keep doing something

hsk-3vocabularya2
搬 (bān) — to move (objects or residence)

HSK 3 | verb | to move, to carry, to relocate

hsk-3vocabularya2
〜ともなると / 〜ともなれば (when it comes to being at the level of)

N1 grammar pattern 〜ともなると/〜ともなれば: when it comes to reaching the level/stage/position of X, certain things naturally follow. Formal register.

japanesen1grammarjlptともなるとともなれば
南 — Kanji Reference

南 (south): 9 strokes, JLPT N5. On: ナン、ナ. Kun: みなみ.

japanesekanjin5writing
〜が — Subject Marker

〜が (ga): JLPT N5 grammar pattern. Usage, structure, examples, and comparison with は.

japanesegrammarn5particles
追 (zhuī) — to chase; to pursue

HSK 3 | verb | to chase after someone or something; to pursue a goal or person

hsk-3vocabularya2
机会 (jīhuì) — opportunity, chance

HSK 3 | noun | an opportunity or favorable occasion to do something

hsk-3vocabularya2
权威 (quánwēi) — authority; authoritative

HSK 6 | n/adj | a recognized expert or authoritative source; having recognized authority

hsk-6vocabularyc1
智能化 (zhìnénghuà) — intelligentization, to make smart

HSK 5 | noun / verb | the process of embedding AI or smart technology into systems and products

hsk-5vocabularyb2
〜てみる — Japanese Grammar

〜てみる: JLPT N4 grammar pattern. Usage, structure, examples, and comparison with similar patterns.

japanesegrammarn4attempt
交 (jiāo) — to hand over / to submit / to make (friends)

HSK 3 | verb | to give, submit, or establish a connection

hsk-3vocabularya2
〜ている — Ongoing Action and Resultant State
japanesegrammarn5verb-forms
Sindarin Courses

All Sindarin online courses — from beginner to advanced — with detailed descriptions, lesson counts, and what each covers.

sindarincourseslearningtolkien
紧张 (jǐnzhāng) — tense; nervous; tight; in short supply

HSK 4 | adjective | feeling of anxiety, or a taut/scarce situation

hsk-4vocabularyb1
五 — JLPT N5 Kanji

五 (go/itsu-tsu): five. JLPT N5 kanji.

japanesekanjin5jlpt
顺利 (shùnlì) — smooth / successful

HSK 3 | adjective | going smoothly, without obstacles or setbacks

hsk-3vocabularya2
民主 (mínzhǔ) — democracy; democratic

HSK 6 | n/adj | a system of governance by the people; the quality of being open, participatory, or egalitarian

hsk-6vocabularyc1
〜を通じて — JLPT N2 Grammar

Learn how to use 〜を通じて (wo tsujite) to express 'through,' 'throughout,' or 'via' when describing a medium, channel, or continuous span. Includes structure, nuance, examples, and comparisons.

japanesegrammarn2jlpt
Lesson 10: Philosophy & Ethics Deep Dive

Dialectical reasoning, materialist philosophy, and the vocabulary of ethics — engaging with Chinese and Western philosophical discourse at C1 level

hsk-6lessonc1
Lesson 6: Food and Drink

Learn to order food and drinks, express what you want to eat using 想 and 要, and talk about Chinese cuisine.

hsk-1lessona1
批评 (pīpíng) — to criticize; criticism

HSK 4 | verb / noun | pointing out faults or shortcomings

hsk-4vocabularyb1
学校 (xuéxiào) — school

HSK 1 | noun | school, educational institution

hsk-1vocabularya1
CF 463B - Caisa and Pylons

We are given a sequence of pylons arranged in a line, starting from position 0 up to position n. The first pylon is fixed at height 0, and every other pylon has a given height.

codeforcescompetitive-programmingbrute-forceimplementationmath
Lesson 20: Reading Connected Latin — Putting It All Together

A review lesson integrating all novice grammar in context: sentence-by-sentence analysis of two Latin passages, a curriculum summary, and independent reading practice.

latinnovicelesson
民主的 (mínzhǔ de) — democratic

HSK 5 | adjective | having the qualities of democracy; based on popular participation

hsk-5vocabularyb2
认为 (rènwéi) — to think, to consider, to believe

HSK 2 | verb | to think (that), to consider, to hold an opinion

hsk-2vocabularya1
起床 (qǐchuáng) — to get up / to get out of bed

HSK 1 | verb phrase | to get up, to rise from bed

hsk-1vocabularya1
条例 (tiáolì) — regulation, ordinance

HSK 5 | noun | a set of official rules or regulations issued by a government body

hsk-5vocabularyb2
苹果 (píngguǒ) — apple

HSK 1 | noun | apple

hsk-1vocabularya1
只要 (zhǐyào) — as long as

HSK 3 | conjunction | as long as, provided that — states the minimum condition for a result

hsk-3vocabularya2
解释 (jiěshì) — to explain; to interpret; explanation

HSK 4 | verb/noun | to give the reason or meaning of something; to clarify or justify

hsk-4vocabularyb1
CF 463A - Caisa and Sugar

We are given a fixed amount of money expressed in dollars, and a list of sugar options in a supermarket. Each option has a price written as dollars and cents.

codeforcescompetitive-programmingbrute-forceimplementation
HSK 3 Vocabulary (499 New Words)

Complete HSK 3 vocabulary reference: 499 new words introduced at A2 level. Organized by category with Chinese, pinyin, English, part of speech, and example sentences.

hsk-3vocabularyhska2chinese
思维 (sīwéi) — thinking, thought

HSK 6 | n | the cognitive faculty of thinking; a mode or pattern of thought

hsk-6vocabularyc1
口 — Kanji Reference

口 (mouth, opening): 3 strokes, JLPT N5. On: コウ、ク. Kun: くち.

japanesekanjin5writing
共同 (gòngtóng) — common; shared; together; jointly

HSK 3 | adj/adv | shared by all parties or done collectively

hsk-3vocabularya2
新能源 (xīn néngyuán) — new energy, renewable energy

HSK 5 | noun | non-fossil energy sources such as solar, wind, and hydrogen power

hsk-5vocabularyb2
判断 (pànduàn) — to judge; judgment; to determine

HSK 4 | verb/noun | to assess a situation and reach a conclusion; the act of judging

hsk-4vocabularyb1
七 (qī) — seven

HSK 1 | number | the digit seven

hsk-1vocabularya1
CF 471A - MUH and Sticks

We are given exactly six stick lengths. To build an animal, four of the sticks must be used as legs, which means those four sticks must all have the same length. After choosing the four leg sticks, two sticks remain. These determine the animal type.

codeforcescompetitive-programmingimplementation
Sindarin Sentence Structure

Sindarin sentence structure: VSO order, subordinate clauses, relative clauses, negation, and complex sentence examples.

sindaringrammarsyntaxtolkien