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Learn 〜わけにはいかない (can't possibly do ~, not in a position to ~) — expressing social, moral, or practical impossibility.

HSK 4 | noun | the background or context of a situation

HSK 3 | adjective/adverb | nearly equal or approximately

Mastering nested relative clauses and long noun phrase chains — the syntactic backbone of advanced Chinese prose

万 (man/ban/yorozu): ten thousand. JLPT N5 kanji.

HSK 3 | verb | to be afraid, to fear, to be scared

HSK 2 | noun | any watercraft, from a small rowboat to a large ship

Essential Japanese vocabulary for illness, medicine, hospitals, exercise, nutrition. N1 level reference with readings, romaji, and examples.

HSK 5 | verb/noun | gradual evolution or development over time

HSK 5 | verb / noun | to sum up; to draw conclusions; a summary

HSK 1 | adverb | indicates future repetition of an action

HSK 4 | verb / noun | to formally apply for something; an application

HSK 3 | noun | quality, standard — how good or poor something is

HSK 5 | noun | financial award given to support a student's education

HSK 3 | noun | photograph, picture taken by a camera

HSK 3 | verb | to look after, take care of, or attend to someone's needs

HSK 3 | adjective / verb | describing hard, tiring work; also used to thank someone for their effort

HSK 5 | adjective | precise, exact, accurate

HSK 3 | noun | a person's name or the name of something

HSK 5 | noun | benefits or services provided to improve well-being

Learn four suffixes that create place words, professional titles, feminine forms, and person-descriptors from any root.

HSK 4 | adjective | lazy; indolent

HSK 5 | verb/noun | to show how something is done; a model example for others to follow

HSK 3 | grammar pattern | describes how well or intensely an action is performed

The conventions of Chinese historical writing — 历史叙述 style, evaluative vocabulary, and the language of historical significance and controversy

N1 grammar pattern 〜ずにはすまない: expressing that social norms, morality, or the situation demands that X be done — one cannot get by without doing X.

HSK 5 | n | the art of effective language use; a rhetorical figure or device

HSK 3 | verb | to accept or confirm something as true

HSK 2 | noun | a question to ask, a problem to solve

HSK 4 | noun/adj | customs and practices passed down through generations

HSK 3 | adverb | after all — points to an underlying truth or fundamental reason

We are given a line of floors from 1 to n. We start on floor a and we will make exactly k moves. Each move picks a new floor y different from the current floor x, but with a restriction: we are not allowed to move “too far” in absolute distance compared to a forbidden floor…

HSK 3 | noun | a card used for credit-based payment

HSK 1 | noun | a female child

HSK 5 | noun/verb | a clash of opposing forces, interests, or ideas

Beginner Sindarin: goals, learning resources, grammar checkpoints, and vocabulary targets for the first 30–100 hours.

Learn how to use 〜といっても (to ittemo) to qualify or soften a previous statement — 'even though I say ~, it's not as extreme as you think.' Includes structure, nuance, examples, and comparisons.

HSK 2 | noun/locative | outside, exterior, beyond (contrast with 内)

Cirth — the angular runic script native to Sindarin, adopted by Dwarves as Angerthas Moria and Erebor — with letter tables and famous inscriptions.

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.

特別な (とくべつな / tokubetsu na): special. N4 level Japanese vocabulary.

HSK 1 | noun | friend

An introduction to the Japanese writing system: Hiragana and Katakana. Learn the foundational scripts required to begin your journey toward N5 proficiency.

HSK 4 | adverb | expressing a preference for one option over another

How to use spaced repetition systems for Esperanto vocabulary learning — Anki setup, deck strategy, and optimal review habits.

赤 (red): 7 strokes, JLPT N5. On: セキ、シャク. Kun: あか、あか-い.

HSK 4 | conjunction / preposition | indicating cause or reason

HSK 4 | noun | a fundamental belief or rule guiding behavior

後 (after, behind): 9 strokes, JLPT N5. On: ゴ、コウ. Kun: あと、うし-ろ、のち.

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

HSK 4 | noun | a person who shares in a business venture or partnership

We are given an array of integers, a[1…n], and a recursive function f(i, j) defined on it. The function essentially accumulates sums along specific paths: the base case is simply f(1, j) = a[j], and for later rows, each f(i, j) is the sum of a[j] plus the minimum of f(i-1…

N1 grammar pattern 〜とあって: because of the special circumstance of X, the situation/behavior Y naturally follows. Literary and formal register.

HSK 2 | adverb | exclamation intensifier used in rhetorical or exclamatory sentences

HSK 5 | noun/verb | practical application of theory; to apply knowledge in real action

時 (time, hour): 10 strokes, JLPT N5. On: ジ. Kun: とき.

HSK 3 | noun / verb | a link between people or things; also in set phrases

HSK 3 | noun | face; facial expression; social face, dignity

HSK 4 | noun | a person with specialized professional expertise

HSK 3 | noun | soup, broth, hot liquid dish

HSK 6 | n | interests, benefits, or gains — especially in political, economic, or social contexts

HSK 2 | adjective/adverb | early, in the morning; also used as a morning greeting

HSK 3 | verb | to solve, resolve, or settle a problem or difficulty

Complete Sindarin number system: cardinal numbers 1–1000, ordinals 1st–10th, counting, multiples, arithmetic expressions, and attested number words from Tolkien.

HSK 2 | verb | to retain something in memory; to recall

HSK 3 | verb | to carry out, conduct, or be in progress

Sindarin nouns: i-affection plural formation, the definite article, direct object marking, and the genitive construction.

HSK 5 | noun | a computer or system that provides data or services to other computers over a network

HSK 1 | noun | water

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

HSK 4 | preposition | indicating the object of an action or attitude

HSK 5 | verb | to form; to come into being; to develop into

Express intentions and future plans using 打算, 准备, 要, and 会 in natural Chinese.

Learn 〜ずにはいられない to express irresistible inner compulsion — you cannot help but do or feel something.

HSK 4 | verb / noun | to invite; an invitation

HSK 3 | noun | one's particular way of seeing or interpreting something

HSK 4 | verb/noun | to train, to provide training; training

HSK 8 | noun | integrated circuit; a set of electronic circuits on a single chip of semiconductor material

HSK 1 | preposition | indicates the starting point of movement, time, or origin

Comprehensive N2 capstone with full mock reading passage, 5 comprehension questions, 20 grammar substitution questions, 10 error-correction questions, exam strategy, and Bridge to N1 preview.

Learn food and drink vocabulary and how to order, express preferences, and use the infinitive with modal verbs like voli and ŝati.

HSK 5 | noun/verb | the process of making important decisions, especially in policy or management

HSK 4 | noun/adj | an established measure or criterion used for comparison or judgment

Esperanto vocabulary for school, university, subjects, learning, and academic life.

HSK 5 | n/v | a rhetorical comparison; to describe something by likening it to something else

HSK 4 | n | physical training, sports, or PE as a subject

HSK 4 | noun | a person who buys goods or services

HSK 6 | verb | to make clear, to illuminate the meaning of something complex

気 (spirit, mood): 6 strokes, JLPT N5. On: キ、ケ. Kun: none.

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

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

HSK 4 | adjective | referring to a specific, pre-determined thing rather than a general one

Analyzing 政治语体: the vocabulary, rhetoric, and pragmatics of Chinese political communication.

Express additive and cumulative relationships using 不但...而且, 既...又, and 不仅...还 at B1 level.

HSK 4 | noun / verb | a regular behavior or the state of being accustomed

HSK 3 | adjective/verb | widely spread or currently trendy

HSK 3 | adverb / verb | doing things separately or parting from each other

HSK 5 | noun | a medical institution providing inpatient and outpatient care

HSK 5 | verb/noun | computer programming; to write or code a program

Codeforces 465A: inc ARG