How do you solve Remove Zeros in Decimal Representation on LeetCode?

Remove Zeros in Decimal Representation (LeetCode #3726) can be solved using Brute Force or Optimal Solution. The optimal approach is Optimal Solution with O(n) time complexity and O(n) space complexity. Key insight: Removing characters from a string can be done efficiently using built-in functions.

What is the time complexity of Remove Zeros in Decimal Representation?

The optimal solution for Remove Zeros in Decimal Representation runs in O(n) time and uses O(n) space. The complexity is linear due to a single pass through the string and the creation of a new string.

What is the brute force solution for Remove Zeros in Decimal Representation?

The brute force approach for Remove Zeros in Decimal Representation is Brute Force, with O(n²) time complexity and O(1) space complexity. Convert the integer to a string and iterate through each character to build a new string without zeros. This is straightforward but inefficient. The optimal Optimal Solution approach improves this to O(n).

What algorithm or data structure is used to solve Remove Zeros in Decimal Representation?

Remove Zeros in Decimal Representation uses the following concepts: Math, Simulation. The recommended patterns to study are: String Manipulation, Filtering.

What are the interview tips for Remove Zeros in Decimal Representation?

Explain your thought process clearly. Consider edge cases during your solution. Optimize your solution after the initial brute force.

What are common mistakes when solving Remove Zeros in Decimal Representation?

Forgetting to convert back to an integer after filtering. Not handling edge cases like leading zeros in the result.

#3726

Remove Zeros in Decimal Representation

Easy

MathSimulationString ManipulationFiltering

LeetCode ↗

Approaches

Brute ForceOptimal

Complexity Comparison

	Brute Force	Optimal Solution★
Time	O(n²)	O(n)
Space	O(1)	O(n)

💡

Intuition

Time O(n)Space O(n)

Using string manipulation directly to filter out zeros is efficient. We can do this in one pass, making it faster.

⚙️

Algorithm

3 steps

1Step 1: Convert the integer n to a string.
2Step 2: Use a list comprehension to filter out '0' characters.
3Step 3: Join the filtered characters and convert back to an integer.

solution.py2 lines

1def remove_zeros(n):
2    return int(''.join(c for c in str(n) if c != '0'))

ℹ

Complexity note: The complexity is linear due to a single pass through the string and the creation of a new string.

1Removing characters from a string can be done efficiently using built-in functions.
2Understanding string manipulation is crucial for solving similar problems.

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