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Coding Problems Interview Questions
Software Engineer • 2 Questions
Detailed coding problems interview questions and answers for software engineer positions.
Q
Write a function to reverse a string.
A
Multiple approaches: 1) Using built-in reverse: return s[::-1] 2) Iterative: result = ""; for char in reversed(s): result += char 3) Recursive: if len(s) <= 1: return s; return reverse(s[1:]) + s[0]. Time complexity O(n), space complexity varies by approach.
Q
Find the first non-repeating character in a string.
A
Use hash map to count character frequencies, then iterate through string to find first character with count 1. Time complexity O(n), space complexity O(k) where k is the character set size. Python: char_count = {}; for char in s: char_count[char] = char_count.get(char, 0) + 1
Mastering Coding Problems for Software Engineer Interviews
Coding Problems questions are fundamental to software engineer interviews. These questions test your understanding of core concepts and your ability to apply them in real-world scenarios.
How to Prepare
- Understand the fundamentals: Make sure you have a solid grasp of basic concepts
- Practice explaining: Be able to explain complex topics in simple terms
- Use examples: Support your answers with concrete examples from your experience
- Stay current: Keep up with industry trends and best practices
Common Mistakes to Avoid
- Giving overly technical answers without context
- Not providing specific examples or use cases
- Focusing only on theory without practical application
- Not asking clarifying questions when needed