Monotonic Queue/Stack

https://leetcode.com/problems/shortest-subarray-with-sum-at-least-k/discuss/204290/Monotonic-Queue-Summary

The following question can be solved by monotonic queue:

• LC84. Largest Rectangle in Histogram

• LC239. Sliding Window Maximum

• LC739. Daily Temperatures

• LC862. Shortest Subarray with Sum at Least K

• LC901. Online Stock Span

• LC907. Sum of Subarray Minimums