Technically, L1 & L2 are line segments, and L3 & L4 are polylines.
Tell me the slope
Increment a number, given its digits
Project Euler: Problem 4, Palindromic numbers
Rotate input square matrix 90 degrees CCW without rot90
Find a Pythagorean triple
MatCAT - Reconstruct X from Its X-rays
Make a function that returns its own character count
Remove the air bubbles
How long is the longest prime diagonal?
Give a matrix that matches itself when rotated
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