| 3. Longest Substring Without Repeating Characters | | | Solve | Medium | | |
| 159. Longest Substring with At Most Two Distinct Characters | | | Solve | Medium | | |
| 187. Repeated DNA Sequences | | | Solve | Medium | | |
| 209. Minimum Size Subarray Sum | | | Solve | Medium | | |
| 340. Longest Substring with At Most K Distinct Characters | | | Solve | Medium | | |
| 395. Longest Substring with At Least K Repeating Characters | | | Solve | Medium | | |
| 413. Arithmetic Slices | | | Solve | Medium | | |
| 424. Longest Repeating Character Replacement | | | Solve | Medium | | |
| 438. Find All Anagrams in a String | | | Solve | Medium | | |
| 487. Max Consecutive Ones II | | | Solve | Medium | | |
| 567. Permutation in String | | | Solve | Medium | | |
| 658. Find K Closest Elements | | | Solve | Medium | | |
| 713. Subarray Product Less Than K | | | Solve | Medium | | |
| 718. Maximum Length of Repeated Subarray | | | Solve | Medium | | |
| 837. New 21 Game | | | Solve | Medium | | |
| 904. Fruit Into Baskets | | | Solve | Medium | | |
| 930. Binary Subarrays With Sum | | | Solve | Medium | | |
| 978. Longest Turbulent Subarray | | | Solve | Medium | - | |
| 1004. Max Consecutive Ones III | | | Solve | Medium | | |
| 1031. Maximum Sum of Two Non-Overlapping Subarrays | | | Solve | Medium | | |
| 1052. Grumpy Bookstore Owner | | | Solve | Medium | | |
| 1100. Find K-Length Substrings With No Repeated Characters | | | Solve | Medium | | |
| 1151. Minimum Swaps to Group All 1's Together | | | Solve | Medium | | |
| 1156. Swap For Longest Repeated Character Substring | | | Solve | Medium | | |
| 1208. Get Equal Substrings Within Budget | | | Solve | Medium | | |
| 1234. Replace the Substring for Balanced String | | | Solve | Medium | | |
| 1248. Count Number of Nice Subarrays | | | Solve | Medium | | |
| 1297. Maximum Number of Occurrences of a Substring | | | Solve | Medium | | |
| 1343. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold | | | Solve | Medium | | |
| 1358. Number of Substrings Containing All Three Characters | | | Solve | Medium | | |
| 1423. Maximum Points You Can Obtain from Cards | | | Solve | Medium | | |
| 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | | | Solve | Medium | | |
| 1456. Maximum Number of Vowels in a Substring of Given Length | | | Solve | Medium | | |
| 1477. Find Two Non-overlapping Sub-arrays Each With Target Sum | | | Solve | Medium | | |
| 1493. Longest Subarray of 1's After Deleting One Element | | | Solve | Medium | | |
| 1658. Minimum Operations to Reduce X to Zero | | | Solve | Medium | | |
| 1695. Maximum Erasure Value | | | Solve | Medium | | |
| 1838. Frequency of the Most Frequent Element | | | Solve | Medium | | |
| 1839. Longest Substring Of All Vowels in Order | | | Solve | Medium | | |
| 1852. Distinct Numbers in Each Subarray | | | Solve | Medium | | |
| 1871. Jump Game VII | | | Solve | Medium | | |
| 1888. Minimum Number of Flips to Make the Binary String Alternating | | | Solve | Medium | | |
| 1918. Kth Smallest Subarray Sum | | | Solve | Medium | | |
| 2024. Maximize the Confusion of an Exam | | | Solve | Medium | | |
| 2090. K Radius Subarray Averages | | | Solve | Medium | | |
| 2107. Number of Unique Flavors After Sharing K Candies | | | Solve | Medium | | |
| 2134. Minimum Swaps to Group All 1's Together II | | | Solve | Medium | | |
| 2260. Minimum Consecutive Cards to Pick Up | | | Solve | Medium | | |
| 2401. Longest Nice Subarray | | | Solve | Medium | | |
| 2411. Smallest Subarrays With Maximum Bitwise OR | | | Solve | Medium | | |
