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Tag Archives: shuffle

Generate a subset in a uniformly random manner

21 Feb

Question: To generate a K-subset in a uniformly random manner from N elements. We have two slightly different solutions. The first one is quite straightforward:  shuffle the elements, and then return the first K elements. In such solution, the space … Read More »

Interview Questions, Java algorithm, shuffle Leave a comment

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Recent Comments

  • Fabien November 7, 2024 at 4:42 am on Unofficial Solutions to the Training by CodilitySimilar but more compact solution using C++17 or later: #include <stack> #include <vector> using namespace std; using point = pair<int, int>; stack<point> pending; void explore(const...
  • Ovi February 12, 2024 at 11:14 pm on Solution to Min-Perimeter-Rectangle by codilityExactly my question too. I tried something very similar to Sheng's solution, importing the math module and using sqrt(). Codility marked it only as 80%,...
  • Doron Ben Ari February 11, 2024 at 4:10 am on Solution to Min-Avg-Two-Slice by codilityInspired by Sheng's great solution, I wrote the following proof: Assume you found the slice with minimal average. Assume the first two consecutive elements of...
  • Ovi February 4, 2024 at 9:03 am on Solution to sigma2012 (Stone-Wall) by codility def solution(H): heights = H # geometric logic: the blocks need to be cuboid, all sides are rectagular. Nothing fancy, means that the angles...
  • Ovidiu Oprea February 2, 2024 at 11:06 am on Solution to Fish by codilityIt's the reason why it took me 2 weeks to finish this task (in the context of adult life with non-dev job). I was trying...
  • Ovi January 15, 2024 at 2:40 pm on Solution to Brackets by codilityThanks for this blog post! I was banging my head against the wall thinking this is a simple / short solution, where you just build...
  • parikshit verma July 5, 2023 at 8:26 am on Solution to Missing-Integer by codility def missingnum(a): st=min(a) en=max(a) b=set(range(1,en+2)) if (en<1 or st>1) : return 1 else: return min(b-set(a))
  • Pavankumar Nandeshwar June 26, 2023 at 8:07 am on Solution to Dwarfs-Rafting by codilityOk fixed it. gives 100%: int solution(int N, string &S, string &T) { int q = N / 2 * N / 2; int lf...
  • Pavankumar Nandeshwar June 26, 2023 at 5:23 am on Solution to Dwarfs-Rafting by codilityCan someone explain what is wrong with my solution in C++ ? int solution(int N, string &S, string &T) { int q = N /...

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