Doing LeetCode in different programming languages for interviews

Have you ever wondered whether sticking with Python or trying out Java on LeetCode could give you an edge in technical interviews? For many candidates, LeetCode is the go-to platform for honing problem-solving skills, but choosing between a single language or multiple languages often sparks debate. Each approach has its benefits and challenges, influenced by factors like comfort level, job requirements, and personal learning preferences.

As you navigate your LeetCode journey, you may find yourself asking the following:

• Is it better to use a language I know well, or should I consider learning something new for greater flexibility?

• How does my comfort level with a specific language impact my performance on LeetCode problems?

• Should I focus on mastering a single programming language for LeetCode or practice in multiple languages?

• What are the benefits and drawbacks of sticking to one language vs. learning several?

• How does the choice of languages, such as Python or Java, affect my problem-solving approach?

• Can practicing in multiple languages enhance my problem-solving skills or simply add complexity?

This blog will explore both sides of the debate by exploring the questions above, helping you figure out the best strategy for your LeetCode practice. Following is a snapshot of the key factors we’ll be discussing in this blog:

Comfort level—already an expert in a programming language#

If you already have expertise in a language you frequently use at work, it’s often best to stick with it for LeetCode practice. Here are some concrete reasons why:

• Prioritize problem-solving: The main challenge in interviews is often problem-solving, not language fluency. Using a familiar language helps you focus on this aspect.

• Built-in libraries: You’re familiar with the language’s standard libraries and functions, allowing you to use them effectively without needing to learn new ones.

• Familiar syntax: You know the language’s syntax inside and out, which helps you write code faster and with fewer errors. Avoid the time and effort required to learn new syntax and features of different languages.

Sticking with a language you know prevents switching between different languages for work and interviews, making your preparation more streamlined.

Career stage: Are you a pro coder or a recent graduate?#

If you are an experienced programmer, you likely have worked with several programming languages and can easily switch between them as needed. This flexibility allows you to handle various data structures and built-in functions more effectively with different time and space complexities. The algorithm design part of problem-solving is not dependent on the language, but different languages offer libraries and built-in functions that can help you solve problems more quickly. Because you are already an expert, you can practice LeetCode problems in multiple languages, comparing their performance and utilizing different features to enhance your problem-solving skills.

On the other hand, if you are a recent graduate, sticking with a single language is generally more beneficial. While you might consider learning a new language beyond what you studied during your undergraduate years, managing and mastering multiple languages simultaneously can be challenging. Focusing on one language allows you to deepen your understanding and improve your problem-solving skills more efficiently.

Interview preparation time: When are you planning your next interview?#

Learning a new programming language requires a significant investment of time. Here are some considerations:

• Flexible schedule: If you have ample time before your interview, incorporating new language learning into your preparation timeline can be feasible.

• Existing commitments: Your busy schedule already includes revising data structures and tackling LeetCode problems, so adding a new language might strain your preparation.

• Planning: Only consider learning a new language if your interview is scheduled far enough in advance to manage this additional task effectively.

If your LeetCode style interview is approaching soon, it’s generally best to focus on reinforcing your current knowledge and skills rather than taking on the challenge of a new language.

Besides the time you have at your disposal, the duration of interview and the specific language requirements set by the company are significant factors in deciding which programming language to select.

Interview duration: How long are your interviews?#

When considering which programming language to use during an interview, the duration of the interview itself can significantly impact your decision. Certain languages might offer distinct advantages depending on whether you have a short or extended session.

• Shorter interviews:

  • Stick with a language you’re most familiar with to save time.

  • Consider using a concise language like Python to focus on problem-solving rather than verbose code.

• Longer interviews:

  • You might have the flexibility to use a more verbose language like Java.

  • Longer sessions allow you to benefit from languages that offer better readability or structure for complex problems.

Programming language requirements: What does the company expect?#

When preparing for coding interviews, it’s crucial to consider whether the company you’re interviewing with has specific language requirements or preferences. Some companies may allow you to choose any language, while others might require you to code in a particular language due to the nature of the role or the company’s tech stack.

• Required languages:

  • Some companies prefer or require you to use certain languages like Java, Python, or C++ during interviews.

  • Knowing these requirements can help you focus your preparation on the right language.

• Pseudocode option:

  • Some companies allow or even prefer that candidates write in a pseudo-code style, focusing on logic rather than syntax.

  • This approach can be beneficial if you’re strong in problem-solving but less familiar with the specific language. If that is the case, you can practice LeetCode in any language you are comfortable with.

Python vs. other languages: Is Python your best bet?#

Python is often favored for problem-solving-based coding interviews for its ease of use and fast implementation, while other languages like Java or C++ might offer advantages in specific scenarios. To help you make an informed decision, here’s a comparison of Python against other commonly used languages based on various factors influencing problem-solving in interviews.

From the comparison, it’s evident that Python offers several advantages for coding interviews. Its concise syntax and rich standard library allow quicker problem-solving and less time spent on boilerplate code, which can be essential during high-pressure interview situations. Python’s flexibility and ease of use can streamline your LeetCode practice, enabling you to focus more on improving your problem-solving strategies rather than dealing with complex syntax. However, depending on the problem or the company's requirements, languages like C++ or Java may be more appropriate for the task.

Moving forward#

Moving forward, it’s important to recognize that covering every problem on LeetCode isn’t feasible, given the platform’s extensive problem set. Instead, focusing on learning patterns can significantly enhance your ability to crack LeetCode-style interviews. These patterns provide a framework that makes approaching and solving a wide range of problems easier.

Also, specific paths are available that are tailored to the interview processes of major tech companies like Microsoft, Google, Meta, and others. These paths focus on the unique problem types, question formats, and topics that these companies emphasize during their interviews, providing a more targeted approach to your preparation.

In mastering LeetCode and coding interviews, finding the right approach and resources is key. Whether you choose to stick with a single programming language or explore multiple ones, staying consistent and focused on your practice is most important. Remember, the goal is to enhance your problem-solving skills and build confidence for the interview. With the right strategies, tools, and dedication, you’ll be well-prepared to tackle the challenges ahead and land your dream job.

Good luck!