Most Asked Sliding Window LeetCode Questions in Google Interviews
Sliding Window is one of the most important techniques used in Google software engineering interviews. It helps optimize problems involving subarrays, substrings, and continuous ranges, reducing time complexity from brute-force approaches.
Many problems combine sliding window with concepts like hash tables, two pointers, and strings, making it a must-know pattern for coding interviews.
If you're new to related concepts, you can also explore:
In this guide, we have compiled some of the most frequently asked Sliding Window problems reported in Google interviews. Each question includes its difficulty level, interview frequency, and a direct link to the LeetCode problem so that you can start practicing immediately.
Below is a curated list of Sliding Window LeetCode questions asked in Google interviews.
| Sl.No | Question | Difficulty | Frequency | LeetCode Link |
|---|
| 1 | Longest Substring Without Repeating Characters | MEDIUM | 82.60% | Solve |
| 2 | Minimum Adjacent Swaps for K Consecutive Ones | HARD | 72.60% | Solve |
| 3 | Minimum Window Substring | HARD | 54.80% | Solve |
| 4 | Subarray Product Less Than K | MEDIUM | 46.70% | Solve |
| 5 | Contains Duplicate II | EASY | 42.20% | Solve |
| 6 | Number of Substrings Containing All Three Characters | MEDIUM | 37.90% | Solve |
| 7 | Find Longest Special Substring That Occurs Thrice I | MEDIUM | 37.50% | Solve |
| 8 | Binary Subarrays With Sum | MEDIUM | 37.50% | Solve |
| 9 | Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | MEDIUM | 37.50% | Solve |
| 10 | Maximum Beauty of an Array After Applying Operation | MEDIUM | 37.50% | Solve |
| 11 | Substring with Concatenation of All Words | HARD | 32.60% | Solve |
| 12 | Longest Substring with At Most Two Distinct Characters | MEDIUM | 25.10% | Solve |
| 13 | Kth Smallest Subarray Sum | MEDIUM | 25.00% | Solve |
| 14 | Minimum Operations to Reduce X to Zero | MEDIUM | 25.00% | Solve |
| 15 | Jump Game VII | MEDIUM | 25.00% | Solve |
| 16 | Max Consecutive Ones II | MEDIUM | 25.00% | Solve |
| 17 | Find Two Non-overlapping Sub-arrays Each With Target Sum | MEDIUM | 25.00% | Solve |
| 18 | Max Value of Equation | HARD | 25.00% | Solve |
| 19 | Find Longest Special Substring That Occurs Thrice II | MEDIUM | 25.00% | Solve |
| 20 | Length of Longest Subarray With at Most K Frequency | MEDIUM | 12.50% | Solve |
| 21 | Longest Subarray of 1's After Deleting One Element | MEDIUM | 12.50% | Solve |
| 22 | Find the Longest Equal Subarray | MEDIUM | 12.50% | Solve |
| 23 | Maximum Number of Visible Points | HARD | 12.50% | Solve |
| 24 | Count Subarrays With Fixed Bounds | HARD | 12.50% | Solve |
| 25 | Minimum Difference Between Highest and Lowest of K Scores | EASY | 12.50% | Solve |
| 26 | Maximize the Confusion of an Exam | MEDIUM | 12.50% | Solve |
| 27 | Constrained Subsequence Sum | HARD | 12.50% | Solve |
| 28 | Longest Duplicate Substring | HARD | 1.42% | Solve |
| 29 | Sliding Window Median | HARD | 1.41% | Solve |
| 30 | Longest Substring with At Most K Distinct Characters | HARD | 1.38% | Solve |
| 31 | Minimum Window Subsequence | HARD | 0.43% | Solve |
| 32 | K Empty Slots | HARD | 0.42% | Solve |
| 33 | Fruit Into Baskets | MEDIUM | 0.12% | Solve |
| 34 | Maximum Number of Vowels in a Substring of Given Length | MEDIUM | 0.04% | Solve |
You can also track your progress and practice these questions using our tool:
Google LeetCode Interview Questions Tracker
How to Prepare for Sliding Window Questions in Google Interviews
To perform well in Google coding interviews, it’s important to master sliding window patterns and variations.
Some useful preparation strategies include:
- Understanding fixed window vs variable window techniques
- Practicing problems involving longest/shortest substring or subarray
- Using hash maps for frequency tracking within a window
- Combining sliding window with two pointers for optimization
- Reducing brute-force solutions from O(n²) to O(n)
You can strengthen your preparation by also practicing:
Mastering sliding window will significantly improve your problem-solving speed and efficiency in interviews.
Related Articles