There are three "change case" operators,
gu "Convert to lowercase
gU "Convert to uppercase
g~ "Toggle case
Since these are operators, they take a motion, so to convert the current character to lowercase you would use
gul
Here's where the fun trick comes in. :) If you want to change...
2
Write a Brainfuck interpreter in Brainfuck
Since Brainfuck is known to be turing-complete, it is possible to write a Brainfuck interpreter in Brainfuck. This is what you're supposed to do.
You will get the input from the standard input and output to the standard output. This is a programming-pu...
Given an integer N as input, output the Nth permutapalindromic number.
A permutapalindromic number is a strictly positive integer such that there is at least one permutation of its digits that results in a palindrome (i.e. a number that is its own reverse).
For example, 117 is a permutapalindro...
In mathematics, a square triangular number (or triangular square number) is a number which is both a triangular number and a perfect square. There are infinitely many square triangular numbers; the first few are 0, 1, 36, 1225, 41616, 1413721, 48024900, 1631432881, 55420693056, 1882672131025 (sequence A001110 in the OEIS).
== Explicit formulas ==
Write Nk for the kth square triangular number, and write sk and tk for the sides of the corresponding square and triangle, so that
N
k
=
s
...
Vim, 78 68 78 79 62 keystrokes
Completely changed my approach:
oo/\$kjxd<esc>/o<cr>xj$/\/<cr>xj$/\\<cr>xj$/$<cr>xj$/k<cr>xj$/x<cr>xj$/j<cr>xj$/d<cr>xkdd
How it works:
First, it makes a line with all the program characters, then, it finds the first instance of each of the program characters, ...
Output the nth rational number according to the Stern-Brocot sequence
The Stern-Brocot sequence is a Fibonnaci-like sequence which can be constructed as follows:
Initialise the sequence with s(1) = s(2) = 1
Set counter n = 1
Append s(n) + s(n+1) to the sequence
Append s(n+1) to the sequence
In...
Introduction
You're working on a government programming team, who have been programming the speed cameras. However, the group of people who have programmed the speed calculator have taken up too much space, so you have to make the number plate recognition software as small as possible.
Challeng...
