How do you solve First Letter Capitalization II on LeetCode?

First Letter Capitalization II (LeetCode #3374) 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: Handling special characters like hyphens is crucial.

What is the time complexity of First Letter Capitalization II?

The optimal solution for First Letter Capitalization II runs in O(n) time and uses O(n) space. This approach is linear since it processes each character once, making it efficient.

What is the brute force solution for First Letter Capitalization II?

The brute force approach for First Letter Capitalization II is Brute Force, with O(n²) time complexity and O(1) space complexity. This approach processes each word individually, checking and modifying each character. It's straightforward but inefficient due to repeated operations. The optimal Optimal Solution approach improves this to O(n).

What algorithm or data structure is used to solve First Letter Capitalization II?

First Letter Capitalization II uses the following concepts: Database. The recommended patterns to study are: String Manipulation, Character Processing.

What are the interview tips for First Letter Capitalization II?

Explain your thought process clearly. Consider edge cases like empty strings. Optimize your solution after the brute force explanation.

What are common mistakes when solving First Letter Capitalization II?

Forgetting to handle spaces correctly. Not converting remaining letters to lowercase.

#3374

First Letter Capitalization II

Hard

DatabaseString ManipulationCharacter Processing

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)

This approach processes the string in a single pass, modifying characters directly. It efficiently handles hyphenated words and ensures minimal space usage.

⚙️

Algorithm

3 steps

1Step 1: Traverse each character in the content_text.
2Step 2: Capitalize the first character of each word and handle hyphens appropriately.
3Step 3: Construct the modified string in a single pass.

solution.py13 lines

1def capitalize_words(content):
2    result = []
3    capitalize_next = True
4    for char in content:
5        if char == ' ':
6            result.append(char)
7            capitalize_next = True
8        elif capitalize_next:
9            result.append(char.upper())
10            capitalize_next = False
11        else:
12            result.append(char.lower())
13    return ''.join(result)

ℹ

Complexity note: This approach is linear since it processes each character once, making it efficient.

1Handling special characters like hyphens is crucial.
2Maintaining original spacing is important.

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