It's very important to actually code the solution and see if it's passing all the test cases.

To make this easy for you , we have provided Coding Interview Practice Excercises  where you will be able to do this in the Udemy Editor itself without the need to set up your environment or do anything else : 

Once you have written your code in the specified area, please click on 'Run tests' to see if your code is passing all the test cases.

You will be able to see the results as you can see below.

For every test case, you can see the input, expected output and actual output by clicking on the respective test case under the user logs section as shown below : 

Happy Practicing :)