# Tag Info

### Slash the matrix

MATL, 21 bytes 3XytPJ*-X*Xj~4&1ZIunq The input is a matrix with 1 for \ and ...

### Weakened Binary Walls

MATL, 4 bytes BSXB Try it at MATL Online Explanation ...

### Is there a single straight line in the matrix?

Python 2, 49 bytes Takes as input a 2D binary matrix $a$, and its size $n$. lambda a,n:sorted(map(sum,a+zip(*a)))[-2:]==[1,n] Try it online! There may be ...

### Which tetromino is this?

Python 3, 124 bytes ...

### Construct the Identity Matrix

MATL, 2 bytes Xy A translation of my Octave answer. Try it online. A 4 byte version with no built-ins (thanks to Luis Mendo): ...

### Construct the Identity Matrix

TI-BASIC, 2 bytes identity(Ans Fun fact: The shortest way to get a list {N,N} is ...

### Is it bipartite?

Wolfram Language (Mathematica), 26 25 bytes Tr[#//.x_:>#.#.Clip@x]<1& Try it online! How it works Given an adjacency matrix A, we find the fixed ...

### Construct the Identity Matrix

Julia, 9 3 bytes eye This is just a built-in function that accepts an integer n and returns an ...

### Construct the Identity Matrix

APL, 5 bytes ∘.=⍨⍳ This is a monadic function train that accepts an integer on the right and returns the identity matrix. Try it here

### Construct the Identity Matrix

R, 4 bytes diag When given a matrix, diag returns the diagonal of the matrix. However, when given an integer ...

### Decode Faux Braille

JavaScript (ES6),  148 146 143  142 bytes Saved 1 byte thanks to @ngn ...

### The Binary Square Diagonal Sequence

Husk, 15 14 bytes zȯḋm←CtNCİ□ṁḋN Try it online! Continually prints the results as an infinite list. Explanation I wonder whether there's a better way to get ...
Accepted

### Where is that snake going?

Wolfram Language (Mathematica), 16+83=99 bytes Library import statement (16 bytes): <<Combinatorica` Actual function body (83 bytes): ...

### Trim that distracting background off!

MATL, 5 bytes JYaZy Try it online! Or verify all test cases. Explanation ...