or slowly? Do US citizens need a reason to enter the US? Code along with me as we solve 'Third Angle of a Triangle', a Level 8 kyu #javascript #codewars challenge. Start training on this collection. If these colours are identical, the same colour is used in the new row. Codewars | - Love To Work With Computer And Mechanical System, odd_row = lambda n:list(range(n*(n-1)+1,n*(n+1),2)). red, green or blue. The input string will only contain the uppercase letters 'B', 'G' or 'R'. Do I have a misconception about probability? . Counting Triangles in a Rectangular space using BIT Aha, I see it works because there is no division after additions. Simply put, in this algorithm we want to state that for the i-th line, the length of the line must also be i . Remember, this is going to be visible by everyone so think of something that others will understand. Lets save this information first. Thanks for contributing an answer to Stack Overflow! But, how? A description has not yet been added for this collection. To solve this one you need some better math than the one you are using now. Making statements based on opinion; back them up with references or personal experience. as I mentioned at the beginning, the nth row contains n elements. Lets take a look at the ilustration below: Based on the above ilustration, we will realize the following: if we represent the first element of the nth row as a_n and the last element of the nth row as z_n, then by following the above pattern we can find that : because every distance between the closest elements in a row is 2 and the length of the nth row is n, then : that way, we can show the relationship of each row in the triangle as : applying the same rules, we can produce the following formula: its like a recursive function. For completeness, here's a table of run-time for various input sizes on my system (debug output disabled): It crosses the one-second threshold somewhere between 20,000 and 30,000 characters. The graph above illustrates how the input size affects the algorithm we wrote earlier. If these colours are identical, the same colour is used in the new row. Since we are using python which is famous for its simplicity of syntax, we can represent the rows in the triangle as an array (python list) by typing result = [] . Get started now by creating a new collection. To learn more, see our tips on writing great answers. Reddit, Inc. 2023. Im more concerned with whether Code Wars allows console.logs or if not because mine werent showing up. Any help helping to get it to pass the rest would be appreciated! By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. 3) = and == and === are different things. 10,730 of 143,953 silentZaika Details Solutions Discourse (509) Description: Implement a function that accepts 3 integer values a, b, c. The function should return true if a triangle can be built with the sides of given length and false in any other case. #10 - Valid Spacing CodeWars Kata (7 kyu) - DEV Community This is what I ended up using for the answer: I was forgetting the <= cases in the if statement. If they are different, the missing colour is used in the new row. \lparen {n \atop k} \rparen = \frac {n!} this is easy. It probably works for. All rights reserved. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Is there a word for when someone stops being talented? Codewars vs HackerRank | Which Will Make You A Better Programmer? COLORS = set ("RGB") def triangle (row): while len (row) > 1: row = ''.join (a if a == b else (COLORS- {a, b}).pop () for a, b in zip (row, row [1:])) return row In the harder variant the task is to do the same, but performance is asked. A coloured triangle is created from a row of colours, each of which is red, green or blue. There's no obvious indicator there (or in this question) that it needs to run in a certain time (unless that's only stated once you join). Another example is the 5th row. Triangles such as the one below are called triangles of consecutive odd numbers: The challenge is that we are asked to find out the row of the triangle if the index is known (in this problem, the index of the triangle starts from 1, not 0). Closest and Smallest CodeWars Kata (5 kyu) - DEV Community Cold water swimming - go in quickly? You must wait until you have earned at least 20 honor before you can create new collections. Is this a triangle? help - The freeCodeCamp Forum My solution: function solution(str) { var arr = str.split('') var res = [] for(let i = 0; i<arr.length; i+=2) { if(arr[i+1]) res.push(arr[i]+arr[i+1]) else res.push(arr[i]+'_') } return res } Explanation First I made an array of the string, and an array to save the result var arr = str.split('') var res = [] For more information, please see our . Programmer And Science Enthusiast . The picture above explains that the distance between the 2 closest elements in a row is 2. because we know the first element, with this concept we can also determine the second, third, and so on. my solution: Codewars. Discourse (20) You have not earned access to this kata's solutions. Hey guys!! true : s.split(' ').find(el=> el=='') >= 0 ? than the last, are generated by considering the two touching colours To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This is a challenge on Codewars. Codewars 7 kyu Is This a Triangle? JavaScript - YouTube Implement a method that accepts 3 integer values a, b, c. The method should return true if a triangle can be built with the sides of given length and false in any other case. Third Angle of a Triangle | Codewars Triangles such as the one below are called triangles of consecutive odd numbers: the triangle and indexing system First it doesn't work for two of the five test cases and second it is still too slow for a larger first row that is tested when submitting the code. {k! 65 of 1,169 taw. Therefore, the elements in the third row are 7, 7+2, 7+2+2 or 7, 9, 11. Conversion to base-3 is easy with integer division: Note that since n_i, m_i are always in the range [0, 2] (because they are base-3 digits), C(n_i, m_i) are very easy to calculate: The above code passes all tests. Remember, this is going to be visible by everyone so think of something that others will understand. #41 - Split Strings Codewars Kata (6 kyu) - DEV Community as I mentioned earlier, with the above formula we can also find out the other elements in the related row. triangle. Just click on, https://www.codewars.com/kata/insane-coloured-triangles/train/c, codewars.com/kata/insane-coloured-triangles, codewars.com/kata/insane-coloured-triangles/train/c, gist.github.com/jcsahnwaldt/c059df6eee99794c9551cd9f6c3dcb7a, What its like to be on the Python Steering Council (Ep. in terms of time complexity, Big-O notation shows how much influence the input size has on the speed of our algorithm. Physical interpretation of the inner product between two quantum states. Find needed capacitance of charged capacitor with constant power load, Cartoon in which the protagonist used a portal in a theater to travel to other worlds, where he captured monsters. Check out these other kata created by boatmeme. ", 5, 82, and returns "Not a valid triangle"', function() {, var typeOfTriangle = function (sideA, sideB, sideC) {, https://github.com/Codewars/codewars.com/wiki/About-Codewars, https://www.codewars.com/kata/564d398e2ecf66cec00000a9/javascript, If any one of the sides of the triangle were not a string, return Not a valid Triangle, If any two sides of the triangle added up to less than or equal to the third side, return Not a valid Triangle, If all sides were equal, return Equilateral, If only two sides were equal, return Isosceles. Collections are a way for you to organize kata so that you can create your own training routines. triangle inequality theorem: which states that the sum of the side lengths of any 2 sides of a triangle must exceed the length of the third side. Codewars. . Is this a triangle? JavaScript. Codewars - Javascript - Third Angle of a Triangle - YouTube in the first process, we loop as many values as the index given by the problem (lets call it n), so we can write it as for i in range(n+1). codewars javascript - Triangle Type - SOLVED IN 4 EASY STEPS! Hint: the hypotenuse in a right triangle is always the longest side. (n.d.). So, we need a better solution. Description: You are given two interior angles (in degrees) of a triangle. Is this a triangle? Codewars is where developers achieve code mastery through challenge. here is the implementation: see, even by using the Java language which is famous for its complex syntax, we only need to add 3 lines of code. codewars Triangle type, . @jcsahnwaldt: Optimised the code a little but t still may not be suitable for the website in the link. https://www.codewars.com/kata/5a25ac6ac5e284cfbe000111/train/python. we are given a problem in the form of a triangle containing a collection of odd numbers (see the picture above as an illustration). In the case of the example above, you would the given RRGBRGBByou should return G. The input string will only contain the uppercase letters R, G, Band there will be at least one letter so you do not have to test for invalid input. rev2023.7.24.43543. Is this a triangle? | Codewars We do this step according to the information we got at the beginning of this article. Create a function t_area that will take a string which will represent triangle, find area of the triangle, one space will be equal to one length unit. The method should return true if a triangle can be built with the sides of given length and false in any other case.</p>\n<p dir=\"auto\"> (In this case, all triangles must have surface greater than 0 to be accepted).</p>\n<hr>\n<h3 tabindex=\"-1\" dir=\"auto\"><a id=\"user-content-given-code\" class=\"anchor\" aria-hidden=\"true\" href=\"#given. Here is my solution : let res = 0 function solution (n) { if (n - 1 <= 0) { return 0 } if ( (n - 1) % 3 > 0) { if ( (n - 1) % 5 > 0) { return solution (n - 1, res) } else { res += n - 1 solution (n - 1, res) } } else { res += n - 1 solution (n - 1, res) } return res } Implement a method that accepts 3 integer values a, b, c. The method should return true if a triangle can be built with the sides of given length and false in any other case. codewars - so i have to practice on codewars for homework and - devRant Colour here: G G B G R G B R, Becomes colour: G R B G. You will be given the first row of the triangle as a string and its your job to return the final colour which would appear in the bottom row as a string. Get started now by creating a new collection. I think its just if the lengths of sides a + b are greater than c, it cant be a triangle, which should be easy enough to implement. Hello! so, if we already know the first element of a row of triangles, then it is not difficult for us to know the other elements in that row. Get started now by creating a new collection. Triangle area | Codewars Successive rows, each containing one fewer colour than the last, are generated by considering the two touching colours in the previous row. Solving CodeWars Problem: Row of The Odd Triangle, Implemented in Java Help with Codewars-Kata : r/learnpython - Reddit A coloured triangle is created from a row of colours, each of which is red, green or blue. #36 - Sum of Multiples CodeWars Kata (8 kyu) - DEV Community Obviously you could iterate over each line of the triangle to get the answer and I've done that already, but that is far too slow to work compared to a mathematical solution. CodeWars - javascript - Multiples of 3 or 5 recursively Another fact is the difference between the last element in the n-th row and the first element of the (n+1)-th row is 2. for example, the difference between the last element in the 2nd row and the first element of the 3rd row is 2. from here we can get 2 important pieces of information: So, if we want to generate a list/array containing odd numbers, we just need to perform the addition operation between the numbers 1 and 2 repeatedly. My solution: function validSpacing(s) { return s=='' ? #18 - Previous multiple of three CodeWars Kata (7 kyu) Thanks! The number of triangles that can be formed with it are mC3 (every 3 points when joined will make a triangle); if we had to count only degenerate triangles, we would have to subtract the number of triangles with zero areas or formed from points on the same line. Every collection you create is public and automatically sharable with other warriors. Mrs. MK, Teacher Code Warrior: Solving Codewars 7kyu- Which triangle is A coloured triangle is created from a row of colours, each of which is red, green or blue. Cookie Notice Are there any practical use cases for subtyping primitive types? if ((a + b < c) || (a + c < b) || (b + c < a)) {. GitHub: Let's build from here GitHub By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. As a follow-up, can you still console.log() in CodeWars? suppose the first element of a row is b, then the second element is b+2, the third element is b+2+2, the fourth element is b+2+2+2, and so on. however, the code only works well for small inputs. How to generate odd numbers? we can create an array representing this row by typing long[] result = new long[n]; . that is, as the input size increases, the time required by this algorithm increases quadratically. a single colour, is generated. I suspected the issue was with the math not with the syntax (this time). I've been working on the Codewars-Insane Coloured Triangles Kata, but am a little stuck.I am trying to use the formula from this stackoverflow question.Obviously you could iterate over each line of the triangle to get the answer and I've done that already, but that is far too slow to work compared to a mathematical solution. If they are different, the missing colour is All representations as binomial coefficient, or: How often in Pascal's Triangle . GitHub. Integer Triangles I: Maximum Number of Integer Triangles with the Smallest Perimeter. Description: Task. I will assume that the formula in the link you provided is correct: In order to avoid integer overflow, we will need to apply these modulo arithmetic rules: without directly calculating the coefficient itself (which can cause overflow)? If you are only given one colour as the input, return that colour. if you have found the formula above, you should be happy, because this problem will be much easier. Yeah I Have done your idea before and worked just with sample tastes but when the length of row become 100,000 the compiler give me run out of time :/, Downvote. The code challenges( codewars call it kata) that I found is named Row of The Odd Triangle . Thanks for the response. Note: only positive integers will be tested. because we only do the for loop once, the time complexity of the above algorithm is O(n). Coloured Triangles | Codewars Because of its time complexity: The table-based approach processes all levels of the triangle, which is O(n^2) (see Triangle Numbers). 8. Since 3 is a prime number, this can be accomplished with Lucas's theorem: where n_i, m_i are the i-th digits of n, m in base-3. To solve this problem, all we need to do is find a way to count the first element in each row in the triangle. simple, right? 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. the difference is, in this case, we have to set the row_temp value to an empty list/array again every time the odd number generation process finishes on a row. I'll remove my downvote. the number of elements of the 7th row is 7, the number of elements of the 8th row is 8, the number of elements of the 9th row is 9, and so on. In this problem, we are given a triangle of consecutive odd numbers. So, in general we can conclude that each element of a row in the triangle above can be expressed as : however, because the indexing system in most programming languages (including java and python) starts from 0, then the above formula needs to be modified to : believe me, the only difficulty in this problem is finding the formula above. we need to create a list/array containing odd numbers, and we apply this process to all rows in the triangle using a for a loop. Problem: - GitHub: Let's build from here Set the name for your new collection. Codewars.com: Pascal's Triangle, Easy Line, Uniq String Characters. First, lets describe the conditions of the problem above more clearly. We have a recursive function pascalRecursive (n, a) that works up till the number of rows are printed. Conclusions from title-drafting and question-content assistance experiments Can you help me decreasing my code time execution? Probably the two best ways to solve this are probably either a simple while loop: >! When all pairs are done, remove the last character from the string, resulting in a string with one less character. I've been working on the Codewars-Insane Coloured Triangles Kata, but am a little stuck. help sethstephanz June 2, 2019, 2:40am #1 Hi. Your issue is here: Set the name for your new collection. The factor that causes the previous algorithm to work inefficiently is that there are too many looping processes carried out. Alright, lets get back to our main discussion. with this formula, we can find the first element of each row in the triangle. How to Solve This Problem ? Take turns remixing and refactoring others code through, Find your next career challenge powered by, Achieve honor and move up the global leaderboards, Learn about all of the different aspects of Codewars. Does this definition of an epimorphism work? Programmer of fikrinotes.netlify.app website . where n denotes a row of the triangle, and k is a position of a term in the row. its easy, isnt it? for example, the length of the 3rd line is 3. as well as the other lines. I am trying to make a code for this problem: (Source: https://www.codewars.com/kata/insane-coloured-triangles/train/c). def easyline (n): a = [ [1]] for size in range (2,n+2): tmp = [1]*size for i in range (1,size-1): tmp [i] = a [-1] [i-1] + a [-1] [i] a.append (tmp) return sum (x*x for x in a [-1]) Raw pascal_tirangle.py # https://www.codewars.com/kata/5226eb40316b56c8d500030f import functools {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"#1 Matrices : Making an Alternating Sum.js","path":"#1 Matrices : Making an Alternating Sum . 3 velveteen-mars 37 5y @Fast-Nop right, thanks! The part that is messing with me is that its passing several of its tests. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Ranks begin at 8 kyu - 1 kyu and then from 1 dan - 8 dan. What is Codewars? Each row is a element of the 2-D array ('a' in this case) Not the answer you're looking for? Privacy Policy. Thats what I originally thought, but when I first searched, the results were all about finding a triangle from three points (which includes determining if one point is on a line between two other points) and I thought it might be trickier to solve. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. The link to the challenge is here: https://www.codewars.com/kata/56606694ec01347ce800001b/train/javascript The instructions are: Implement a method that accepts 3 integer values a, b, c. A test run on a random 100,000-character string managed to complete in just under 15 seconds so, if it needs to be faster than that, this solution won't be suitable. Now what we have to do is arrange the above formula so that it forms a function a_n which only depends on the independent variable n. from high school classes, you know that 1+2+3+4++n is equal to n*(n+1)/2. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. if we are given index = 2, then we should produce output [3, 5] and so on (please read the question instructions in more detail in the link above). Then, we are asked to determine all the numbers contained in a column in the triangle, in the correct order and order. Btw., youll find it much easier to type the code as the directions describe it. this needs to be done so that the value in the previous row is not in the current row. Solutions. Note that it was written in favor of clarity, not performance. Reddit and its partners use cookies and similar technologies to provide you with a better experience. let r = 0; Then I used a for loop that will iterate until the result of i*n is smaller than "m". Powered by Discourse, best viewed with JavaScript enabled, https://www.codewars.com/kata/56606694ec01347ce800001b/train/javascript, https://www.youtube.com/watch?v=NGHZVjYqA2s. why do we only need the first element? Ignore dots. when you open this problem page in codewars and select python as your language, then you will see the following code template: we can implement the same method using the python language, but with a slightly different syntax. Codewars | . You must wait until you have earned at least 20 honor before you can create new collections. For those of you who are quite familiar with algorithms and data structures, you may be familiar with the term big-O notation. Reddit, Inc. 2023. The smallest triangle will have one length unit. If these colours are identical, the same colour is used in the new row. Who counts as pupils or as a student in Germany? If you pay close attention, you will notice that the length of a row in the triangle is equal to the index of that row. def triangle (row): while len (row)>1: row = ''.join (a if a==b else (set ("RGB")- {a,b}).pop () for a,b in zip (row, row [1:])) return row or a recursive loop: (if you're playing code golf, or just testing clever ways to use python) If these colours are identical, the same colour I'm having just a little trouble with this kata. After you have added a few kata to a collection you and others can train on the kata contained within the collection. if we start counting sequentially from the number one, and we add it with 2, then every number we produce is an odd number. Solutions are locked for kata ranked far above your rank. If we apply the above algorithm using python, we will find the following solution: We are done. the smallest difference of weights ie that are the closest with the smallest weights and with the smallest indices (or ranks, numbered from 0) in strng Output: an array of two arrays, each subarray in the following format: [number-weight, index in strng of the corresponding number, original corresponding number in strng] Codewars. . Triangle type. JavaScript - YouTube Code Noob 178 subscribers Subscribe 7 722 views 5 years ago In this codewars javascript video I'll be taking you step by step in. Coloured Triangles - Codewars : r/learnpython - Reddit the above code can solve the above codewars problem. A coloured triangle is created from a row of colours, each of which is red, green or blue. Once you cycle through the items Here's some sample code that shows this in action, with unnecessary but useful checks and output functions: The output of that code when run with the argument RRGBRGBB is, as expected: It also works with strings up to the limit (100,000 characters) but keep in mind it's an O(n2) solution so will slow down as the sizes get larger. By using math, we can save a few lines of code and increase the efficiency of a program. Every collection you create is public and automatically sharable with other warriors. Privacy Policy. codewars/codewars.com Wiki. Ruby Solutions for Geometry Basics: Triangle Perimeter in 2D | Codewars 66. CodeWars Python Solutions - GitHub: Let's build from here more efficient in terms of syntax and also more efficient in terms of time complexity. CodeWars - Sum of odd Numbers - For loop - Stack Overflow is used in the new row. Big-O notation for the algorithm i wrote above is O(n). 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