1.https://leetcode.com/problems/sliding-window-maximum/description/
2.https://leetcode.com/problems/maximum-sum-of-distinct-subarrays-with-length-k/description/
3.Max Sum Subarray of size K
4.First negative integer in every window of size k
5.Count Occurences of Anagrams
6.https://leetcode.com/problems/number-of-substrings-containing-all-three-characters/description/
7.https://leetcode.com/problems/minimum-operations-to-reduce-x-to-zero/description/
8.longest substring with k unique characters
9.https://leetcode.com/problems/longest-substring-without-repeating-characters/description/
10.longest substring with repeating characters