leetcode-1438 - Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
動機 sliding window但是用heap去找window的最大最小 ...
Queue
leetcode-862 - Shortest Subarray with Sum at Least K
動機 What makes this problem hard is that we have negative values. sliding window + monotone stack = monotone queue prefix sum in fly + hash ...
leetcode-232 - Implement Queue using Stacks
動機 很經典，但沒想過可以用兩個stack ...
leetcode-341 - Flatten Nested List Iterator
動機 讓每個遞迴只負責一個工作 ...
leetcode-387 - First Unique Character in a String
動機 複習Counter ...
leetcode-239 - Sliding Window Maximum
動機 從sliding window到寫merge interval的變化版 ...