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BQN, 32 bytesSBCS Run online! {∨´∾8(⥊(⊐⌾⥊𝕩)⍷·≠⌜˜2|/∘⥊)¨1+↕≠⥊𝕩} Brute force: tests against all boards up to the number of characters in 𝕩 using Find (⍷). Using the longest dimension is faster b...
BQN (CBQN), 10 bytes Anonymous function that takes m on the left and n on the right. {𝕨‿𝕩⥊↕𝕨×𝕩} ↕𝕨×𝕩 # list of range [0,m*n) 𝕨‿𝕩⥊ # reshape list to m*n Try it here!
BQN, 107 bytes A↩C←A⇐¯π{_𝕣_:@;/⊏𝕩.y?𝕗‿∊𝕊⟨𝕤,⍷⟩𝕏𝕎𝔽𝕨𝔾𝕘}∞˙⌜˘¨´˝`(•Js⎉⊔⎊⌽⌾⍉⚇«∘»·∧○∨⍋⍒↑↓≍∾˜⥊⋈↕⊢⍟⊣¬!|≡≢/≥⟜≠=⊸≥⊐⊘⊒◶⊑><⌊⌈√⁼⋆+-×÷)⋄# BQN doesn't have keywords but primitive symbols are reserved. It's ...
BQN, 13 bytesSBCS ∧´0≠⊢|˜·×˜2+↕ Run online! A train submission. It's 2 bytes shorter than the lambda version {∧´0≠𝕩|˜×˜2+↕𝕩}, due to omitting curly braces. The idea is similar to ruby: ran...
BQN, 13 bytes {+´(𝕨⋆↕≠𝕩)×𝕩} { } # fn +´ # sum reduce (𝕨⋆↕≠𝕩) # x^i for each term ×𝕩 # times each coefficient Try it
BQN, 31 28 bytes {1+(1≠𝕩)◶¯1‿𝕊2(|⊑÷˜∾1+3×⊢)𝕩} Try it online! An anonymous function which takes a number. the ¯1 branch is a bit tacky but saves a byte over (1+𝕊).
BQN, 3 bytes Anonymous tacit infix function, taking the second string as left argument and the first string as right argument. ⥊⌊⌜ ⌊⌜ minimum table ⥊ deshape (flatten) BQN treats characters ...
BQN, 8 bytes {𝔽´1+↕𝕩} Try it! basic fold builtin version. Use as a dyadic 1-modifier. Longer than APL since evaluated output is shorter than using first class functions. A more fun recursive...
BQN, 11 9 bytesSBCS Run online! 1⌽⍟⊢⍋3|↕9 The result is a length 9 list of lists using the numbers 0 to 8. The solution is based on the 3x3 transpose list 036147258, obtained with Grade Up. T...
BQN, 21 bytesSBCS (¬·×-+´·/0=↕⊸|)¨⊸⊔1+↕ Run online! Mostly one big train used to find the appropriate group for each number, to be used with Group (⊔). The combining functions in a train norma...
APL (Dyalog Unicode), 31 bytes ⎕←↑(14↑(2⌷x),⍨⌽)¨,\1⌷x←⍉13 2⍴⎕A Try it online! Lot worse than the BQN answer. ⎕←↑(14↑(2⌷x),⍨⌽)¨,\1⌷x←⍉13 2⍴⎕A ⎕A ⍝ String of up...
BQN, 18 bytesSBCS 'A'-¬⊸⌊2×13-˜⌜○↕14 Run online! This solution computes a table of c-r, where r is the row number and c is the column number, so that the first row is 0 1 2… and the first colu...
BQN, 8 bytesSBCS ⍒↕+2|⊢+↕ Run online! The solution itself is an 8-train, so its evaluation order is given by the sequence 7 5 6 3 4 1 2 0: first the rightmost ↕, then the ⊢, then the + between...
APL (Dyalog Unicode), 15 bytesSBCS With many thanks to Marshall Lochbaum and dzaima for their help debugging and golfing this answer {⍵∪⌊⍵*2|⍵+.5}⍣≡ {⍵∪⌊⍵*2|⍵+.5}⍣≡ ⍝ ⍵ is our input of eith...
BQN, 17 bytesSBCS {𝕩∾1𝕊⍟≠⌊𝕩⋆2|𝕩+÷2} Run online! BQN primitives alone can't express unbounded iteration, so this must be a recursive block function. {𝕩∾1𝕊⍟≠⌊𝕩⋆2|𝕩+÷2} # Function 𝕊 taking argu...
BQN, 33 bytesSBCS >(⌽(⊑¨55↑+˜⊸+⊔'0'+⌽⊸⌊⊸⌊)¨˜1↓↑)↕28 Run online! Minimum of barycentric coordinates placed according to a skew transformation on two of them. So, the min(i,j,27-i-j) thing pr...
BQN, 18 bytesSBCS {⊑(⊑𝕨⊸⍷)¨⊸/∾⟜𝕩¨↑𝕨} Run online! A direct translation of Razetime's APL solution (my attempted improvement ⊣∾{⊢´/𝕨⊸«⊸≡¨↑𝕩}↓⊢ turns out to be not at all correct). The BQN solut...
BQN, 7 6 bytesSBCS ≢↑∘⊢´↕ Run online! The less-golfed version {↑⍟𝕩⟨⟩} is more readable: it applies Prefixes (↑) the given number of times to the empty list ⟨⟩ and… that's it. (Suffixes also wo...
BQN, 8 bytesSBCS ∾⊒˜¨⊔○∾⊢ Run online! and parsing diagram The idea here is to build a list of groups, with group i containing the ith character of each string that has one, then join the group...
BQN, 15 bytesSBCS {𝕨(1+⊢𝕊-)⟜𝕩⍟>0} Run online! A block function that takes $t_1$ as the left argument 𝕨 and $t_2$ as the right argument 𝕩. In BQN, 𝕊 indicates recursion on the current block ...
BQN, 44 bytesSBCS +´{(≠↑𝕨-𝔽)⊸+2↓⊑∨(≍×𝕨≥⊢)○𝔽˜⟜×⊸∾¨(<1+𝕩)×⥊↕2¨𝕩} Run online! The solution is a function that takes n as the left argument (𝕨) and A as the right argument (𝕩). k is just the le...
BQN, 25 bytesSBCS ⌊⊸≡(/0=↕⊸|){(+´÷≠)∘𝔽¨«⟜𝔽} Run online! This expression has a complicated structure. This link uses BQN's explain feature to show the order in which everything is applied. It's...
BQN, 14 solutions (SBCS) Run online! This link shows the result of each expression and a table of character intersections. Each expression intersects with itself only, giving a diagonal matrix. Th...
BQN, 19 bytesSBCS ' '+32⊸<⊸×+⌜˜⌽⊸⌊↕59 Run online! This uses the whitespace allowance, padding by four spaces on all sides to make the arithmetic work better. It can be adjusted by replacing...
BQN, 20 bytesSBCS ∾2/0‿8⊏↓"∾2/0‿8⊏↓""" Run online! BQN's strings escape double quotes by doubling them, so that the string used to start with only contains a single quote, although the output ...
