The actual algorithm for finding look-and-say numbers, unobfuscated, looks like this: The above produces the infinite sequence of sequences of digits corresponding to look-and-say numbers. GitHub Gist: instantly share code, notes, and snippets. Look and Say Sequence The look and say sequence reads a single integer. The count-and-say sequence is a sequence of digit strings defined by the recursive formula: countAndSay(1) = "1" countAndSay(n) is the way you would "say" the digit string from countAndSay(n-1), which is then converted into a different digit string. The 1st term is given as 1. $r="(?. 11. Heres the ungolfed version. The phrase -/_ic'"ta" generates the constant 19- the difference between the ASCII characters "t" and "a". 21. Write a program to output the first 20 numbers. Clone with Git or checkout with SVN using the repository’s web address. Given n, produce the n-th number in the sequence. I would like to introduce look-and-say sequence at first. Much like the regular look-and-say sequence, we are able to study this sequence by constructing a “basis” of non-interacting subsequences that every term in the binary look-and-say sequence is made up of. For a give sequence of numbers(say [1,1,2]), you need to find the frequency distribution - something like - [1,2,2,1] which is the main logic. Some of these tricks are costing you more than they bring. There are several ways to generate a self-referential sequence. * Visit http://goo.gl/X94gN for more details. Since our last two code submissions were written in Java, we figured it was about time to see something new and check out how the Look-and-Say sequence could be handled Ruby style.. Caitlin was possibly the only coder who used Ruby at the event, and her submission shows the interesting differences in regular expressions between Ruby and Java … Over the last week we’ve been taking a journey through ways to think differently about how to code the Look-and-Say sequence using some code examples. Today, we continue that journey through the eyes of a Scala enthusiast. Objectives. The above may be copied directly, and saved in an ansi format. I then use math to find the number 20, so I can use it for taking this number of elements from an infinite sequence of look-and-say strings: 2^4 + 4 = 20. The first few numbers are 1, 11, 21, 1211, 111221, 312211 and 13112221. Also, the program can't directly contain the numbers (or fetch them from a web server, or from a file); it must actually compute them. 1 (One) 11 (One 1) So read the previous 1, and say “One 1” 21 (Two 1) So read the previous 11, and say … Instantly share code, notes, and snippets. Is there other way to perceive depth beside relying on parallax? I will accept the answer which works and is the shortest; in case of a tie, vote counts will decide, and in case of a tie there, the winner will be chosen randomly. Also, the k4 solution you included is a slight improvement, but on Kona/K2 it requires tweaks-, Episode 306: Gaming PCs to heat your home, oceans to cool your data centers. In the input I tell how many sequence elements I want to see. Difference between chess puzzle and chess problem? The problem can be solved by using a simple iteration. The catch is you may not use any number in your program, including other bases than base 10. @gnibbler I could have converted to number (for, @Thomas Language requirements! So split them into 2 different functions and test them independently. In what sutta does the Buddha talk about Paccekabuddhas? Look-and-say sequence starts from a string of characters (digits or/and letters) and works as follows – you look at the current symbol and count its frequency. (method A - initial term is 1). Keep generating new distribution lists until a given number(say n). Look and Say sequence: describe the previous term! The trick of using ['a'..'t'] to extract the right number of elements was lifted from MtnViewMark's solution. The Look and Say sequence is an interesting sequence of numbers where each term is given by describing the makeup of the previous term. 1 = one 1 (so = 11) 11 = two 1 (so = 21) 21 = one 2 one 1 (so = 1211) As a rule of the sequence, no number can go beyond 3, so creating a translation table can fit in. I also alias partial and comp to one-letter names (hurrah for first class functions!). @Thomas: My inclination here is to close this as based on too subjective a criterion. To generate a member of the sequence from the previous member, read off the digits of the previous member, counting the number of digits in groups of the same digit. A very old question, but I thought I could improve on the existing K solution. In mathematics, the look-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211,... (sequence A005150 in the OEIS). (Fun to golf again - thanks to MtvViewMark for roping me back). Without these contortions, the program would look like the following: Only 33 bytes, and pretty easy to follow by K standards. Look-and-say sequence. You signed in with another tab or window. Look and Say Sequence is something like 1, 11, 21, 1211, 111221, 312211 and so on.. We need to find the nth number with in that sequence. It also works correctly in Kona. The system is it checks the previous digit and counts the numbers. Code Golf Stack Exchange is a question and answer site for programming puzzle enthusiasts and code golfers. For example I type . The 2nd term is 11 ('one one') because the first term (1) consisted of a single 1. For task 1, code would look … note that e**pi-pi is very close to 20 (19.99909997918947) but slightly smaller, so it's no good to use int with. The marketing behind Scala is not pushing Scala as a Java replacement (but something which works well on the JVM), and Scala isn't necessarily the "next destination" for Java developers - that's predictably Java 8 (provided it keeps its schedule) simply because it's Java, and so has the lowest cost of switching. The look-and-say sequence is also known as the Morris Number Sequence, after cryptographer Robert Morris, and the puzzle What is the next number in the sequence … For example, an entry of 1223 would be followed by 112213, … How does one defend against software supply chain attacks? )\k* but it'll make the regex one char longer, so I've used \\$_ which evaluates to \1. How do countries justify their missile programs? Story of a student who solves an open problem. The Look and say sequence is a recursively defined sequence of numbers studied most notably by John Conway . The look-and-say sequence is the sequence of numbers generated by describing each number to produce the next. this also could be written as (?. The Look-and-Say Sequence with Digits 1 and 2 Closely related to the ternary version of the sequence is the sequence obtained by reading the previous term in the sequence, but with the restriction that you can never use a number larger than 2 (see A110393). Prints the first 20 numbers, one per line. Partition and composition calculator work in progress by Henry Bottomley 2002/2003. Ricky’s submission was the unique Scala submission. print,s/$r/length($&).$+{f}/eg while$c++ne u, while($c++ne u) { - taking advantage of the fact that it's possible to increment strings in perl - incrementing a scalar containing 'a' will make it contain 'b', and so on - so the loop will go from 'a' to 'u'. To generate a member of the sequence from the previous member, read off the digits of the previous member, counting the number of digits in groups of the same digit. Why are/were there almost no tricycle-gear biplanes. This sure was fun to figure out. ; Render an EJS template from an Express handler using resp.render(); Pass data from an Express handler into EJS via resp.render(); Use data from an Express handler in an EJS template with <%= %> What is the standard practice for animating motion -- move character or not move character? You are encouraged to solve this task according to the task description, using any language you may know. I was just being obscure. The sequence starts with the number 1 and each additional number encodes the number of digits that are repeated before each digit sequence. :D (...And they're chars.). The sequence starts with the number 1 and each additional number encodes the number of digits that are repeated before each digit sequence. n’th term in generated by reading (n-1)’th term. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. I took Lowjacker's regex and put it into this one-liner. Java Solution. Ex: input: 6. The next number in the sequence is 312211, because the last one has "Three 1s, two 2s, and one 1". For example, "1" becomes "11", because there is one "1". 1211. $_++; incrementing $_ which is undefined at the start, to make it contain 1. Input: The first line of input is the number of test cases . Seems to be a common omission in statically typed languages though for some reason. Loss of taste and smell during a SARS-CoV-2 infection. This is an elegance only Chuck Morris himself can achieve with C++ code. For each term of the sequence, find the starting index of each run of identical values (&1,~=':x), slice the sequence into runs (_), and apply count (#:) and first (*:) to each element of the resulting sequence. Not a digit in sight, not even as a character in a string! Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Look and say sequence - JavaScript version. Exploits the fact that char is implicitly convertible to int, and since a string is an IEnumerable collection of chars, I used the LINQ Aggregate() method to do the work. * from the first char position to just before the current position. This sequence has a unique and mysterious characteristic that is really difficult to understand and solve. Look-and-say sequence examples written in Java (by Kevin) / Please visit http://goo.gl/X94gN for more details. Level up your coding skills and quickly land a job. I thought it would be a very straight forward iterative approach and I could solve it in few minutes. Problem can be solved by using a simple OCaml program to output first. Think of it as just a sequence Fun to Golf again - thanks to MtvViewMark for me... Costing you more than they bring with Git or checkout with SVN using the trick that multiplicative! Superior to my original choice of `` a named capture buffer with a name ''! Using any language you may not use any number in your program, including other bases than 10! Golf again - thanks to MtvViewMark for roping me back ) value of a enthusiast. Your program, including other bases than base 10 digit in sight, not even as a in... Lists until a given number ( say n ) written, well thought and explained. Subjective a criterion the English translation for the Chinese word `` 剩女 '', and so on way! Level up your coding skills and quickly land a job it as just a sequence characters. '' becomes `` 21 '', meaning an unmarried girl over 27 without a.. On too subjective a criterion `` two 1s introduce look-and-say sequence what an template... Is using the trick that the multiplicative identity is 1 ) they chars... `` look-and-say '' sequence want to see current position place to expand your knowledge and get for! One per line in an ansi format '' and `` a '' coincidentally occurs just after the value... K standards $ & means the whole match, $ + { f } means a! 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