Project Euler 4 - 5 digits palindrome. What is the value of this product? numArray should be a pointer int* and allocated using malloc, Variable length arrays are permitted in C99. Coloring where all colors are present in closed neighborhood of every vertex. Project Euler ranks this problem at 5% (out of 100%).
See here for a comparison of all solutions. It's very simple, doesn't take a lot of time to code and shouldn't take too long to run. How do open-source projects prevent disclosing a bug while fixing it? project-euler-c. Mostly written in C; Few source code comments; Short source control history; Stable Y-O-Y development activity; No recent development activity; 0 active contributors; Commit Activity Timeline: To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 0.
I started testing from 999*999 downwards. 84580156166097919133875499200524063689912560717606 Scala github.com/samskivert/euler-scala/blob/master/Euler008.scala (written by Michael Bayne) 53697817977846174064955149290862569321978468622482 17866458359124566529476545682848912883142607690042 Why does Ukranian "c" correspond English "h"? 3. if product is higher than before: keep it. Hello, I know that it is a year after your post, but I just recently got into project Euler. 8. In many cases you can make a brute force solutions. I think it is pointless.The main goal of the task is to find out the value that you don't know.So I think it is good to use an array for the solution.Here I present my solution.My running time is 0m0.008s (Mac OS, Intel Core 2Duo 2GHz, RAM 4GB DDR3)Check this out!#include #include #define SIZE 9main(){int i, index = 0;long long num = 0;//create an array of numbers and initialize itint *massiv = malloc(SIZE * sizeof(int));for(i = 1; i <= SIZE; i++) massiv[i] = i;//find a numberwhile(1){ num += 20; for(i = 1; i <= SIZE; i++){ if(num % massiv[i] == 0) index++; else{ index = 0; break; } } if(index == 9) break;}free(massiv);printf("%lld\n", num);return 0;}, To resolve the Euler real task just start with i=11. 83972241375657056057490261407972968652414535100474 the second while loop has no properly defined end condition - it can happily compare values past the bounds of the array. The only things that I have done differently are:I changed the order of the modulus checking. No, the largest should be: 906609. Project Euler is a series of problems involving math and programming. Shouldn't it be 906609? I just got into this website, so sorry for the response years later xD. 85861560789112949495459501737958331952853208805511 Those links are just an unordered selection of source code I found with a semi-automatic search script on Google/Bing/GitHub/whatever. 30358907296290491560440772390713810515859307960866 (compiled for x86_64 / Linux, GCC flags: -O3 -march=native -fno-exceptions -fno-rtti -std=gnu++11 -DORIGINAL). Feature Preview: New Review Suspensions Mod UX, Review queue Help Center draft: Triage queue, Find the largest palindrome made from the product of two 3-digit numbers, Finding Palindromes from the product of two numbers with N digits, Finding the largest palindrome of the product of two three digit numbers problem, Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell, Printing One Dimensional Array with For Loop Programming C. How do I go through a certain number and extract digits smaller than 5 using a recursive function? Project Euler 1 - Multiples of 3 and 5 by Loki. 66896648950445244523161731856403098711121722383113 However, what I find is that placing the print statement (that prints the answer) in different locations prints different answers. There is no problem in the code in finding the number. Project Euler 1 in Java. My approach to detect a palindrome was rather different from yours. Find the number of times each digit appears? Trying to print array elements with certain digits length, but the main() seems like it isn't executed. Because, while using AND logic, the execution stops once it reaches a false result in the comparisons, I wrote the prime numbers first (My order was 17, 19, 13, 11, 12, 14, 15, 16, 18, 20.)
rev 2020.11.12.37996, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, int numArray[count]; This shouldn't even compile. Mathematica github.com/nayuki/Project-Euler-solutions/blob/master/mathematica/p008.mathematica (written by Nayuki)
the incrementation by 2520 is really nice :D thanks for this -NotMyFault, HelloI think it is not good to increment by 2520.
This doesn't explain why his code is giving the incorrect answer. How can a chess game with clock take 5 hours? It's very simple, doesn't take a lot of time to code and shouldn't take too long to run. I've created a solution to problem 4 on Project Euler. 1. Necessity of sudo while installing with dnf. How do I count the number of sentences in C using “.”, “?”, “!”? What is the difference between a spell with a range of "Self" and a spell with a range of "Self (XYZ)"? Just understand the logic here. … was written in C++ and can be compiled with G++, Clang++, Visual C++. Melville's chain of thought in the "great democratic God" passage in "Moby-Dick", Turning right but can't see cars coming (UK). The problems and most of the problems' images were created by Project Euler.Thanks for all their endless effort !!! @P.R: For instance, one very common error with malloc is to forget to free() the memory afterwards, and thus cause a memory leak. Asking for help, clarification, or responding to other answers. If you really are to make beautiful and fast solutions you need to study the math behind the problem. It was quite simple (and might be inefficient too) but the answer would come up "instantly". Or just jump to my GitHub repository. 24219022671055626321111109370544217506941658960408 Podcast 286: If you could fix any software, what would you change? The first challenge is the following. How do I go through a certain number and extract digits smaller than 5 using a recursive function? You should store the palindrome in a variable max and let the code run further as there is a possibility of finding a greater palindrome further. projecteuler.net/thread=8 - the best forum on the subject (note: you have to submit the correct solution first) C# www.mathblog.dk/solution-to-problem-8-of-project-euler/ (written by Kristian Edlund) Hot Network Questions Kudos to the person who solves this riddle Is Phosphine evidence of life on Venus? Code in various languages: 65727333001053367881220235421809751254540594752243 Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell. 7.
By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. A few issues in the isPalindrome function : The Code's Output after making the modifications: Link, The correct printf is the one after the for,after you iterate through all possible values, You are using int to store the value of the palidrome but your result is bigger then 65536, What would you call a person who is willing to give up their life for others? As I type this. Project Euler #1 in C++.
I'm surprised that everyone doesn't get this. February 23, 2017 submitted solution Java github.com/nayuki/Project-Euler-solutions/blob/master/java/p008.java (written by Nayuki)
Here's the problem. 12540698747158523863050715693290963295227443043557 a loop goes through those 13 digits and: 18.
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