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

https://leetcode.com/problems/longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit/description/

Longest subarray with abs(a[i] - a[j]) <= limit #medium #sliding_window #monotonic_queue