How do you solve Create Hello World Function on LeetCode?

Create Hello World Function (LeetCode #2667) can be solved using Brute Force or Optimal Solution. The optimal approach is Optimal Solution with O(1) time complexity and O(1) space complexity. Key insight: The function returned by createHelloWorld does not depend on input arguments.

What is the time complexity of Create Hello World Function?

The optimal solution for Create Hello World Function runs in O(1) time and uses O(1) space. The complexity remains O(1) for both time and space as we are still returning a fixed string without processing any input.

What is the brute force solution for Create Hello World Function?

The brute force approach for Create Hello World Function is Brute Force, with O(1) time complexity and O(1) space complexity. The brute force approach is straightforward: we create a function that returns another function, which always returns 'Hello World'. This is simple and does not depend on any input arguments. The optimal Optimal Solution approach improves this to O(1).

What are the interview tips for Create Hello World Function?

Clarify the requirements before coding. Test your function with different inputs to ensure it behaves as expected. Keep your solution simple and focus on correctness.

What are common mistakes when solving Create Hello World Function?

Overcomplicating the function by trying to process arguments. Not understanding that the function should always return the same string.

#2667

Create Hello World Function

Easy

ClosureHigher-order functions

LeetCode ↗

Approaches

Brute ForceOptimal

Complexity Comparison

	Brute Force	Optimal Solution★
Time	O(1)	O(1)
Space	O(1)	O(1)

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Intuition

Time O(1)Space O(1)

The optimal solution is essentially the same as the brute force approach since the problem is inherently simple. We just need to ensure that the function we return always gives 'Hello World', regardless of input.

⚙️

Algorithm

3 steps

1Step 1: Define a function called createHelloWorld.
2Step 2: Inside createHelloWorld, define a function that ignores its parameters.
3Step 3: Return the inner function that always returns 'Hello World'.

solution.py4 lines

1def createHelloWorld():
2    def hello(*args):
3        return 'Hello World'
4    return hello

ℹ

Complexity note: The complexity remains O(1) for both time and space as we are still returning a fixed string without processing any input.

1The function returned by createHelloWorld does not depend on input arguments.
2The problem is fundamentally simple, focusing on function return behavior.

Solutions and explanations are original Tejav content. Problem titles © LeetCode — use the LeetCode button above for the full problem statement.