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🔥 Critical Programming Questions in 2025 🔥
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These are non-negotiables for landing your next tech job. Start solving now:

1. Reverse a String Without Using Built-in Functions
2. Find All Permutations of a Given String
3. Extract Numbers from a String and Return as a List
4. Count the Number of Vowels and Consonants in a String
5. Replace All Instances of a Substring with Another Substring
6. Find the First Non-Repeating Character in a String
7. Count the Frequency of Each Character in a String
8. Merge Two Strings Alternately
9. Remove All Punctuation from a String
10. Extract a Substring Between Two Characters
11. Check if a String is an Isogram (No Repeated Characters)
12. Convert a Given String to Camel Case
13. Convert a String to a Character Array and Back
14. Check if a String is a Palindrome, Ignoring Case
15. Find the Position of a Substring in a String
16. Check if a String Contains Only Digits
17. Determine if a String is a Valid Number (Integer/Float)
18. Implement String Compression Using Counts of Repeated Characters
19. Find All Unique Characters in a String
20. Rotate a String to the Left by a Given Number of Characters
21. Find the Longest Substring Without Repeating Characters
22. Find the Minimum Number of Steps to Convert One String to Another
23. Check if Two Strings are Rotations of Each Other
24. Swap Case of Each Character in a String
25. Count the Number of Times One String Occurs in Another
26. Check if a String is a Subsequence of Another String
27. Remove All Occurrences of a Given Character
28. Validate a String as a Proper Email Address
29. Count the Number of Words in a String Using Regex
30. Compare Two Strings Without Using .equals()

📌 Which ones have you mastered? Let’s level up!

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