Sliding Window

Not a hard question, but I need to read the description more carefully.

Description: https://leetcode.com/problems/length-of-longest-subarray-with-at-most-k-frequency/description/ Notes: The first solution that came to my mind was brute force: scanning each...

Description: https://leetcode.com/problems/binary-subarrays-with-sum/description/ Notes: My initial approach was a brute force method, which had a time complexity...

My initial approach is quite straightforward: I use two hashmaps. The first hashmap is used to store the required words, and the second one is used to check whether the word counts in each substring are the same.