Problem of The Day: Sum of Subarray Minimums
Problem Statement ``` Given an array of integers arr, find the sum of min(b), where b ranges over every (contiguous) subarray of arr. Since the answer may be...
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Daily Reading: Mindset
My Daily Reading From tonight’s reading, I’ve learned that our mindset can affect how we see effort. In a fixed mindset, we might look down on people who spe...
Problem of The Day: Maximum Length of a Concatenated String with Unique Characters
Problem Statement ``` You are given an array of strings arr. A string s is formed by the concatenation of a subsequence of arr that has unique characters.
Problem of The Day: LRU Cache
Problem Statement ``` Design a data structure that follows the constraints of a Least Recently Used (LRU) cache.
Problem of The Day: Set Mismatch
Problem Statement ``` You have a set of integers s, which originally contains all the numbers from 1 to n. Unfortunately, due to some error, one of the numbe...