#Algorithm Practice #Leetcode vs #HackerRank vs #GeeksForGeeks

For algorithm practises, I would recommend Leetcode, HackerRank and GeeksForGeeks. There are quite a few other platforms out there which hopefully I can give them a try.

Leetcode

Leetcode Question page

Leetcode Note taking function

I have been using Leetcode mostly and I think it is awesome for the following reasons:

• UI is simple and user-friendly.
• They show our code runtime relative to other submissions. 
• It supports most of the popular languages.
• There is a note taking function which comes in handy when you review
• Favorite list function
• Different text editor themes 
• They upload new questions almost every week and currently have 700+ questions

In addition, they have a weekly algorithm contests that users can win some cash and leetcode points.

HackerRank

Hackerrank dashboard

Hackerrank Question page

Recently(2016 to present), I notice that quite many companies use HackerRank for first round coding assessment. It is definitely a good idea to get familiar with the platform and do the algorithm questions they have to offer. I think you should at least get familiar with it if you are applying for a software developer job.

HackerRank also holds regular coding contests.

On HackerRank, there is a cracking the coding interview section where you can practice solving questions from the Cracking the Coding Interview book.

HackerRank also has a more colorful user interface relatively.

On HackerRank, you have to know how to read files programmatically as the input usually comes from file read. For example, the following.

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.util.StringTokenizer;

class TestClass {

    public static void main(String args[] ) throws Exception {

        

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        int t = Integer.parseInt(br.readLine());

        int a[] = new int[t];

        StringTokenizer st = new StringTokenizer(br.readLine());

        int i = 0;

        while(st.hasMoreTokens()){

            a[i++] = Integer.parseInt(st.nextToken());

        }

        

        for (int j = 0; j < t; ++j) {

            int num = a[j];

            for (int k = 1; k <= num; ++k) {

                if (k % 15 == 0)

                    System.out.println("FizzBuzz");

                else if (k % 3 == 0)

                    System.out.println("Fizz");

                else if (k % 5 == 0)

                    System.out.println("Buzz");

                else

                    System.out.println(k);

            }   

        }

    

    }

}

GeeksForGeeks

GeeksforGeeks Homepage

GeeksforGeeks Interview Preparation

GeeksforGeeks has a big collection of questions and recommended solutions. And, I think, it has the longest history among these 3 sites.

GeeksforGeeks contains a lot of popular interview questions. It keeps a good list of trending questions where you can check them out easily.

GeeksforGeeks has an on-site editor for you to compile and test your algorithm but it allows fewer options of languages.

It also has a interview preparation section which I think is a good guide on getting ready for interviews.


Thank you for reading!

Jun