brain

tamnd's digital brain — notes, problems, research

43815 notes

现代 (xiàndài) — modern; contemporary

HSK 3 | adjective/noun | relating to the present era

hsk-3vocabularya2
语境 (yǔjìng) — context, linguistic environment

HSK 6 | n | the situational, cultural, or linguistic context in which a word or utterance occurs

hsk-6vocabularyc1
城市 (chéngshì) — city

HSK 3 | noun | city, urban area — a large, populated urban settlement

hsk-3vocabularya2
一方面 (yī fāngmiàn) — on one hand

HSK 5 | conjunction/adverb | on one hand; in one respect

hsk-5vocabularyb2
理论 (lǐlùn) — theory; in theory

HSK 4 | noun | a theory or theoretical framework

hsk-4vocabularyb1
〜まじき — JLPT N1 Grammar

N1 grammar pattern 〜まじき: a literary/formal adjectival form meaning 'unworthy of, should not, inexcusable for' — expressing strong moral condemnation.

japanesegrammarn1jlpt
Lesson 5: Potential Complements

Learn how potential complements with 得 and 不 express ability or possibility, one of the most productive grammatical patterns in Mandarin.

hsk-3lessona2
城市 (chéngshì) — city; urban area

HSK 4 | noun | a large populated urban settlement

hsk-4vocabularyb1
飞机场 (fēijīchǎng) — airport

HSK 3 | noun | an airport; the facility where aircraft take off and land

hsk-3vocabularya2
提到 (tídào) — to mention; to bring up

HSK 4 | verb | to refer to something briefly in speech or writing

hsk-4vocabularyb1
甚至 (shènzhì) — even; so much so that

HSK 5 | adverb/conjunction | used to introduce an extreme or surprising case

hsk-5vocabularyb2
机会 (jīhuì) — opportunity, chance

HSK 2 | noun | a favorable moment or circumstance to do something

hsk-2vocabularya1
过程 (guòchéng) — process; course; procedure

HSK 4 | noun | the series of steps or stages in completing something

hsk-4vocabularyb1
治疗 (zhìliáo) — Treat, treatment

HSK 5 | verb/noun | to treat an illness; medical treatment

hsk-5vocabularyb2
概述 (gàishù) — to summarize, to give an overview

HSK 6 | verb | to provide a brief but comprehensive overview of a topic

hsk-6vocabularyc1
可以 (kěyǐ) — can, may (permission or possibility)

HSK 2 | modal verb | expressing permission or general possibility; contrast with 能 for ability

hsk-2vocabularya1
瓶 (píng) — measure word for bottles

HSK 1 | measure word | classifier for bottled items

hsk-1vocabularya1
〜らしい — Japanese Grammar

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

japanesegrammarn4hearsay
衣服 (yīfu) — clothes, clothing

HSK 1 | noun | clothes, clothing, garment

hsk-1vocabularya1
CF 471D - MUH and Cube Walls

We have two walls represented by sequences of tower heights. The bears' wall contains n towers, while Horace's wall contains w towers. Horace is allowed to shift his entire wall vertically by any amount.

codeforcescompetitive-programmingstring-suffix-structuresstrings
JLPT N3 Lesson 9: Reading Newspaper Japanese

Decode formal newspaper Japanese at N3 level: headline omission rules, passive constructions, nominalization, 〜により/〜として in formal writing, number expressions, and analysis of real-style article sentences.

japanesen3lessonjlptgrammarnewspaperreadingformal
学 — JLPT N5 Kanji

学 (gaku/mana-bu): study. JLPT N5 kanji.

japanesekanjin5jlpt
分配 (fēnpèi) — to allocate, to distribute

HSK 5 | verb/noun | to assign resources, tasks, or roles according to a plan

hsk-5vocabularyb2
表示 (biǎoshì) — to express / to indicate

HSK 3 | verb | to express, to indicate, to show; to mean, to represent

hsk-3vocabularya2
为了 (wèile) — in order to / for the sake of

HSK 3 | preposition | expressing purpose or goal

hsk-3vocabularya2
无论 (wúlùn) — no matter / regardless

HSK 3 | conjunction | no matter, regardless of — always paired with 都 or 也

hsk-3vocabularya2
认为 (rènwéi) — to think / believe

HSK 3 | verb | to hold the opinion that; to consider; used to state personal views

hsk-3vocabularya2
Lesson 13: Idioms in Context (成语 II)

Master five more classical Chinese idioms, focusing on cautionary tales, irony, and the use of idiomatic variation in context.

hsk-5lessonb2
本 (běn) — measure word for books

HSK 1 | measure word | classifier for bound volumes

hsk-1vocabularya1
机遇 (jīyù) — opportunity, chance

HSK 5 | noun | a favorable juncture of circumstances; a golden chance

hsk-5vocabularyb2
西瓜 (xīguā) — watermelon

HSK 1 | noun | watermelon

hsk-1vocabularya1
点 (diǎn) — o'clock; a bit; point

HSK 1 | noun/measure word | used to tell clock time; also means 'a little' or 'dot/point'

hsk-1vocabularya1
股票 (gǔpiào) — stock; share

HSK 5 | noun | stock, share, equity security traded on a stock market

hsk-5vocabularyb2
既然 (jìrán) — since; given that; now that

HSK 4 | conjunction | accepting a premise and drawing a conclusion

hsk-4vocabularyb1
Lesson 16: Health & Medicine

Discuss health and medical topics using advanced 被 constructions and 受 + emotional/physical state at B1 level.

hsk-4lessonb1
衰退 (shuāituì) — to decline; recession

HSK 5 | verb / noun | to weaken or deteriorate; a period of decline

hsk-5vocabularyb2
漂亮 (piàoliang) — pretty; beautiful

HSK 3 | adjective | visually attractive; beautiful; well done

hsk-3vocabularya2
测试 (cèshì) — Test, to test

HSK 5 | noun/verb | to test or examine; a test or trial

hsk-5vocabularyb2
投资 (tóuzī) — to invest; investment

HSK 4 | verb/noun | to commit money or resources in expectation of future returns

hsk-4vocabularyb1
CF 453D - Little Pony and Elements of Harmony

We have a vector of energies indexed by all bitmasks of length m. Since n = 2^m, every vertex can be identified with an m-bit number. One transformation step is linear.

codeforcescompetitive-programmingdpmatrices
价值 (jiàzhí) — value; worth

HSK 4 | noun | the monetary or intrinsic worth of something

hsk-4vocabularyb1
公斤 (gōngjīn) — kilogram

HSK 2 | measure word/noun | the metric unit of weight equal to one kilogram

hsk-2vocabularya1
决定 (juédìng) — to decide

HSK 3 | verb / noun | to make a decision; a decision

hsk-3vocabularya2
有机 (yǒujī) — organic

HSK 4 | adjective | produced without synthetic chemicals; relating to organic chemistry

hsk-4vocabularyb1
其实 (qíshí) — actually, in fact

HSK 2 | adverb | introduces a correction or revelation, contrasting with what was assumed

hsk-2vocabularya1
日 — JLPT N5 Kanji

日 (nichi/jitsu/hi): sun. JLPT N5 kanji.

japanesekanjin5jlpt
合同 (hétong) — contract; agreement

HSK 4 | noun | a legally binding written agreement between parties

hsk-4vocabularyb1
双 (shuāng) — pair; both; double (measure word)

HSK 2 | measure word / adjective | counts items that come in pairs

hsk-2vocabularya1
小 (xiǎo) — small / little

HSK 1 | adjective | small, little, young

hsk-1vocabularya1
書 — Kanji Reference

書 (write): 10 strokes, JLPT N5. On: ショ. Kun: か-く.

japanesekanjin5writing
参考 (cānkǎo) — to refer to; to consult; reference

HSK 4 | verb / noun | using existing material as a guide or source

hsk-4vocabularyb1
虚伪 (xūwěi) — hypocritical / false

HSK 4 | adjective | hypocritical; false; insincere

hsk-4vocabularyb1
聞 — Kanji Reference

聞 (hear, ask): 14 strokes, JLPT N5. On: ブン、モン. Kun: き-く、き-こえる.

japanesekanjin5writing
図 — JLPT N5 Kanji

図 (zu/to/haka-ru): map. JLPT N5 kanji.

japanesekanjin5jlpt
新 — Kanji Reference

新 (new): 13 strokes, JLPT N5. On: シン. Kun: あたら-しい、あら-た、にい.

japanesekanjin5writing
建议 (jiànyì) — to suggest; suggestion; recommendation

HSK 5 | verb/noun | to propose a course of action; a proposal or recommendation

hsk-5vocabularyb2
论据 (lùnjù) — evidence, grounds

HSK 6 | n | facts, examples, or reasoning used to support an argument

hsk-6vocabularyc1
Lesson 14: Third Declension Adjectives

Two-termination, three-termination, and one-termination 3rd-declension adjectives, with the -ī/-e ablative distinction and the -ium genitive plural rule.

latinnovicelesson
相比之下 (xiāng bǐ zhī xià) — by comparison; in comparison

HSK 5 | phrase | a fixed expression introducing a comparative contrast

hsk-5vocabularyb2
〜ようにする — JLPT N3 Grammar

Learn 〜ようにする (try to ensure, make a point of doing) — the N3 pattern for expressing sustained, deliberate effort to create or maintain a habit.

japanesegrammarn3jlpt
茶 (chá) — tea

HSK 1 | noun | tea

hsk-1vocabularya1
只 (zhǐ) — only; just

HSK 2 | adverb | restricts scope to nothing more than what follows

hsk-2vocabularya1
JLPT N5 Lesson 8: Describing with Adjectives

Master the two types of Japanese adjectives to describe people, places, and things with precision and natural flair.

japanesen5lessonjlpt
Lesson 5: Colors and Adjectives

Learn color vocabulary and how Esperanto adjectives work, including the productive mal- prefix for expressing opposites.

esperantoa1lesson
比 (bǐ) — than; to compare

HSK 2 | preposition/verb | comparison marker; A比B + adj structure

hsk-2vocabularya1
〜とあれば — JLPT N1 Grammar

N1 grammar pattern 〜とあれば: expressing strong motivation or justification — 'if it is for ~, given that ~, should it be the case that ~.'

japanesegrammarn1jlpt
N4 Kanji: 風 (Wind)

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

japanesen4jlptkanjilanguage-learning
好不容易 (hǎo bù róngyì) — finally; with great difficulty; took a lot of effort

HSK 3 | adverb | after much effort or trouble; not easy at all to achieve

hsk-3vocabularya2
胳膊 (gēbo) — arm

HSK 3 | noun | arm, the upper limb from shoulder to wrist

hsk-3vocabularya2
全面 (quánmiàn) — comprehensive; all-around; thorough

HSK 4 | adjective | covering all aspects without leaving anything out

hsk-4vocabularyb1
早上 (zǎoshang) — morning, early morning

HSK 1 | noun | the early part of the day, from dawn to around 9 a.m.

hsk-1vocabularya1
修 (xiū) — to repair / to fix / to trim

HSK 3 | verb | to restore something broken to working order

hsk-3vocabularya2
碳排放 (tàn páifàng) — carbon emissions

HSK 5 | noun | the release of carbon dioxide into the atmosphere from human activities

hsk-5vocabularyb2
和 (hé) — and; with

HSK 1 | conjunction | connects nouns or noun phrases

hsk-1vocabularya1
描述 (miáoshù) — to describe; to depict

HSK 4 | verb/noun | using words to portray something in detail

hsk-4vocabularyb1
CF 465A - inc ARG

Codeforces 465A: inc ARG

codeforcescompetitive-programmingimplementation
正常 (zhèngcháng) — normal; regular; usual

HSK 4 | adjective | within the expected or standard range

hsk-4vocabularyb1
〜ものがある — JLPT N3 Grammar

Learn 〜ものがある (there is something ~ about it, it has a certain quality) — the N3 pattern for expressing an indefinable or deeply felt quality.

japanesegrammarn3jlpt
〜てたまらない — JLPT N2 Grammar

Learn how to use 〜てたまらない (te tamaranai) to express unbearable or overwhelming feelings, sensations, or desires — 'can't stand ~; unbearably ~.' Includes structure, nuance, examples, and comparisons.

japanesegrammarn2jlpt
创造力 (chuàngzào lì) — creativity, creative power

HSK 5 | noun | the ability to produce original and imaginative ideas or works

hsk-5vocabularyb2
屏幕 (píngmù) — screen

HSK 4 | noun | the display surface of a device such as a phone, computer, or TV

hsk-4vocabularyb1
〜に応じて — JLPT N3 Grammar

Learn 〜に応じて (in response to, depending on, adapted to) — the N3 pattern for expressing deliberate, appropriate adaptation to conditions or needs.

japanesegrammarn3jlpt
表达 (biǎodá) — to express

HSK 3 | verb | to convey thoughts or feelings

hsk-3vocabularya2
听到 (tīng dào) — to hear; to catch (a sound)

HSK 2 | verb + result complement | indicates the action of listening results in actually hearing

hsk-2vocabularya1
她们 (tāmen) — they, them (all female)

HSK 1 | pronoun | third-person plural pronoun (all-female group)

hsk-1vocabularya1
成熟 (chéngshú) — mature; ripe; to mature

HSK 5 | adjective/verb | mature; ripe; fully developed (of people, ideas, or fruit)

hsk-5vocabularyb2
Lesson 20: Comparative Culture

Chinese and Western cultural frameworks compared — Confucianism, Daoism, Buddhism, and Western values in analytical discourse at C1 level

hsk-6lessonc1
格局 (géjú) — pattern, structure, situation

HSK 6 | n | the overall pattern, configuration, or situation of affairs; a person's breadth of vision

hsk-6vocabularyc1
施治 (shīzhì) — to treat, administer treatment

HSK 7 | verb | formal medical term for applying therapeutic intervention to a patient

hsk-7vocabularyc2
CF 480D - Parcels

We are given a collection of parcels, each arriving at a specific time and leaving at another specific time. Each parcel carries a weight, a strength, and a value.

codeforcescompetitive-programmingdpgraphs
丰富 (fēngfù) — rich; abundant; to enrich

HSK 3 | adj/verb | plentiful in quantity or variety

hsk-3vocabularya2
我很好 (wǒ hěn hǎo) — I am fine; I am well

HSK 1 | greeting phrase | standard response to 你好吗

hsk-1vocabularya1
N4 Kanji: 寒 (Cold)

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

japanesen4jlptkanjilanguage-learning
开创 (kāichuàng) — to pioneer; to create; to open up

HSK 5 | verb | to be the first to establish or bring something into existence

hsk-5vocabularyb2
Lesson 15: Describing People

Learn to describe personality and character using degree complements, the 极了 intensifier, and a rich set of adjectives for temperament and behavior.

hsk-3lessona2
可爱 (kě'ài) — cute

HSK 1 | adjective | cute, adorable, lovable

hsk-1vocabularya1
研究员 (yánjiūyuán) — researcher

HSK 4 | noun | a person who conducts research

hsk-4vocabularyb1
演化 (yǎnhuà) — to evolve (biologically), to develop

HSK 5 | verb/noun | biological or natural evolution and development

hsk-5vocabularyb2
当然 (dāngrán) — of course; certainly

HSK 2 | adverb | expresses that something is obvious or goes without saying

hsk-2vocabularya1
复习 (fùxí) — to review

HSK 3 | verb | to review or revise material already studied, especially before an exam

hsk-3vocabularya2