Top String LeetCode Questions Asked in Microsoft
String problems are very common in Microsoft software engineering interviews. These questions usually test a candidate’s understanding of string manipulation, hashing techniques, sliding window patterns, and character frequency analysis.
During technical interviews, candidates are often asked to write efficient solutions for problems involving substrings, pattern matching, palindromes, and string transformations. Mastering these patterns can help you significantly improve your performance in coding rounds.
In this guide, we’ve compiled some of the most frequently asked string-related LeetCode questions reported in Microsoft interviews. The list includes the difficulty level, interview frequency, and a direct link to the LeetCode problem, making it easier for you to focus on the problems that matter the most.
Below is a curated list of top string LeetCode questions asked in Microsoft interviews.
| Sl.No | Question | Difficulty | Frequency | LeetCode Link |
|---|
| 1 | Time Based Key-Value Store | MEDIUM | 100.00% | Solve |
| 2 | Longest Substring Without Repeating Characters | MEDIUM | 82.60% | Solve |
| 3 | Group Anagrams | MEDIUM | 78.90% | Solve |
| 4 | Valid Parentheses | EASY | 77.70% | Solve |
| 5 | Bulls and Cows | MEDIUM | 77.30% | Solve |
| 6 | Longest Palindromic Substring | MEDIUM | 77.10% | Solve |
| 7 | Longest Common Prefix | EASY | 70.80% | Solve |
| 8 | Generate Parentheses | MEDIUM | 68.60% | Solve |
| 9 | Letter Combinations of a Phone Number | MEDIUM | 68.20% | Solve |
| 10 | Roman to Integer | EASY | 66.10% | Solve |
| 11 | Word Search | MEDIUM | 63.60% | Solve |
| 12 | Word Break | MEDIUM | 60.60% | Solve |
| 13 | Reverse Words in a String | MEDIUM | 59.50% | Solve |
| 14 | Valid Palindrome | EASY | 59.30% | Solve |
| 15 | Reorganize String | MEDIUM | 58.00% | Solve |
| 16 | Regular Expression Matching | HARD | 56.10% | Solve |
| 17 | Minimum Window Substring | HARD | 54.80% | Solve |
| 18 | Word Break II | HARD | 53.30% | Solve |
| 19 | Zigzag Conversion | MEDIUM | 52.80% | Solve |
| 20 | Find the Index of the First Occurrence in a String | EASY | 52.80% | Solve |
| 21 | Integer to Roman | MEDIUM | 52.20% | Solve |
| 22 | Valid Anagram | EASY | 51.40% | Solve |
| 23 | Longest Valid Parentheses | HARD | 48.70% | Solve |
| 24 | Palindromic Substrings | MEDIUM | 46.70% | Solve |
| 25 | String to Integer (atoi) | MEDIUM | 46.60% | Solve |
| 26 | Add Binary | EASY | 45.70% | Solve |
| 27 | Edit Distance | MEDIUM | 45.70% | Solve |
| 28 | Decode Ways | MEDIUM | 45.30% | Solve |
| 29 | Simplify Path | MEDIUM | 45.30% | Solve |
| 30 | Word Ladder | HARD | 44.80% | Solve |
| 31 | Length of Last Word | EASY | 43.20% | Solve |
| 32 | Isomorphic Strings | EASY | 43.10% | Solve |
| 33 | Wildcard Matching | HARD | 41.60% | Solve |
| 34 | Count and Say | MEDIUM | 40.40% | Solve |
| 35 | Shortest Palindrome | HARD | 38.00% | Solve |
| 36 | First Unique Character in a String | EASY | 37.90% | Solve |
| 37 | Multiply Strings | MEDIUM | 37.60% | Solve |
| 38 | Text Justification | HARD | 36.90% | Solve |
| 39 | Word Search II | HARD | 34.70% | Solve |
| 40 | Substring with Concatenation of All Words | HARD | 32.60% | Solve |
| 41 | Basic Calculator II | MEDIUM | 30.60% | Solve |
| 42 | Fraction to Recurring Decimal | MEDIUM | 30.60% | Solve |
| 43 | Binary Tree Paths | EASY | 29.60% | Solve |
| 44 | Interleaving String | MEDIUM | 28.10% | Solve |
| 45 | Longest Substring with At Most Two Distinct Characters | MEDIUM | 25.10% | Solve |
| 46 | Palindrome Partitioning | MEDIUM | 25.00% | Solve |
| 47 | Restore IP Addresses | MEDIUM | 23.80% | Solve |
| 48 | Palindrome Permutation | EASY | 22.30% | Solve |
| 49 | Valid Number | HARD | 20.30% | Solve |
| 50 | Word Pattern | EASY | 19.00% | Solve |
You can also track your progress and practice these questions using our tool:
Track your progress with our Microsoft interview tracker
How to Prepare for String Questions in Microsoft Interviews
To perform well in Microsoft coding interviews, it’s important to understand common string problem-solving patterns instead of memorizing solutions.
Some useful preparation strategies include:
- Practicing sliding window techniques for substring problems
- Using hash maps to track character frequencies
- Understanding two-pointer techniques for palindrome problems
- Improving your ability to analyze time and space complexity
Practicing real interview problems consistently will help you improve your coding speed, pattern recognition, and overall problem-solving approach during technical interviews.
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