200 reputation for cracking this
I may decrease the reputation later if I decide to reveal new tips.
Optimise Retina transliterations
For the question Translate Morse code based on tone duration I stupidly created the following transliteration:
T`T\EMNAI\OGKDWRUSJ2V\HBZ89#@`NIGDRS8ZCBP\LF\H12356789_`\w@#
The first thing wrong with it is that it 2, 8 and 9 transliterate to themselves, so they...
Definition
If you take the sequence of positive integer squares, and concatenate them into a string of digits (i.e. 149162536496481100...), an "early bird" square is one that can be found in this string ahead of its natural position.
For example, 72 (the number 49), can be found at an offset of...-1
Some of you may be familiar with the BigNum Bakeoff, which ended up quite interestingly. The goal can more or less be summarized as writing a C program who's output would be the largest, under some constraints and theoretical conditions e.g. a computer that could run the program.
In the same spi...
The leading zeroes challenge
code-golf
Given two integers as input (x and y), output x as a string with as many leading zeroes necesary for it to be y characters long.
If x has more than y digits, output x as string without modification.
Output as integer is not accepted, even if there are no...
Anonymous
A Sumac sequence starts with two numbers: t1 and t2.
The next term, t3, = t1 - t2
More generally, tn = tn-2 - tn-1
The sequence ends when tn < 0.
Your challenge: Write a program or function that prints the length of a Sumac sequence, starting with t1 and t2.
Standard loopholes apply.
Test c...
My kids have an alphabet mat to play with, something like this:
After months with the tiles of the mat randomly placed, I got tired and placed all the mats grouped by sections according to their background colors. So, if the letters represent the background color, I got a mat like this:
AABBC...
Stencil codes are a class of iterative kernels which update array elements according to some fixed pattern, called a stencil. They are most commonly found in the codes of computer simulations, e.g. for computational fluid dynamics in the context of scientific and engineering applications. Other notable examples include solving partial differential equations, the Jacobi kernel, the Gauss–Seidel method, image processing and cellular automata. The regular structure of the arrays sets stencil codes apart from other modeling methods such as the Finite element method. Most finite difference codes which...
The problem is the well known Josephus problem with k= 2, but instead of
the first kills beign 2 then 4 it's 1 and 3.
For n = 5 it's
1 2 3 4 5
2 3 4 5
2 4 5
2 5
2
My goal is to get under a 100 chars in C, but general algorithms would be a great help too.
Anonymous
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