README.md

Sliding Window

String	Level	Topics
3. Longest Substring Without Repeating Characters
76. Minimum Window Substring
340. Longest Substring with At Most K Distinct Characters
424. Longest Repeating Character Replacement
1100. Find K-Length Substrings With No Repeated Characters

Hash Table	Level	Topics
3. Longest Substring Without Repeating Characters
76. Minimum Window Substring
159. Longest Substring with At Most Two Distinct Characters
219. Contains Duplicate II
340. Longest Substring with At Most K Distinct Characters
424. Longest Repeating Character Replacement
560. Subarray Sum Equals K
992. Subarrays with K Different Integers
1100. Find K-Length Substrings With No Repeated Characters
1248. Count Number of Nice Subarrays

Fixed Window	Level	Topics
219. Contains Duplicate II
438. Find All Anagrams in a String
1100. Find K-Length Substrings With No Repeated Characters

Longest At Most K	Level	Topics
3. Longest Substring Without Repeating Characters
159. Longest Substring with At Most Two Distinct Characters
340. Longest Substring with At Most K Distinct Characters
424. Longest Repeating Character Replacement
487. Max Consecutive Ones II (Easier, k = 1, 3-pointer)
1004. Max Consecutive Ones III

Exactly K	Level	Topics
992. Subarrays with K Different Integers
1248. Count Number of Nice Subarrays

Finding Minimum Subarray/Substring	Level	Topics
76. Minimum Window Substring
1151. Minimum Swaps to Group All 1's Together

Monotonic Deque	Level	Topics
239. Sliding Window Maximum
1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Reversed Thinking	Level	Topics
1151. Minimum Swaps to Group All 1's Together
1248. Count Number of Nice Subarrays
1423. Maximum Points You Can Obtain from Cards