https://leetcode.com/problems/get-equal-substrings-within-budget/description/

Max substring sum(abs(s[..] - t[..])) < maxCost #medium #sliding_window

https://leetcode.com/problems/grumpy-bookstore-owner/description/

Max customers sum after make consecutive minutes non-grumpy #medium #sliding_window

https://leetcode.com/problems/count-number-of-nice-subarrays/description/

Count subarrays with k odds #medium #sliding_window