An algebraic curve is a certain "1D subset" of the "2D-plane" that can be described as set of zeros {(x,y) in R^2 : f(x,y)=0 }of a polynomial f. Here we consider the 2D-plane as the real plane R^2 such that we can easily imagine what such a curve could look like, basically a thing you can draw wi...

Definition a(1) = 1 a(2) = 1 a(n) = a(n-a(n-1)) + a(n-a(n-2)) for n > 2 where n is an integer Task Given positive integer n, generate a(n). Testcases n a(n) 1 1 2 1 3 2 4 3 5 3 6 4 7 5 8 5 9 6 10 6 11 6 12 8 13 8 14 8 15 10 16 9 17 10 18 11 19 11 20 12 Reference Obligatory OE...

CAPTCHAs (Cops and Robbers Style) cops-and-robbers Cops will write a program that generates a CAPTCHA (either through stdin/stdout or on whatever UI is available to your language using only built-ins). Robbers will attempt to bypass the generated CAPTCHA programmatically, given access to the C...