This link was posted on Dec 30, 2018 in blind Curated List of Top 100 LeetCode Questions. I found it so useful and would like to cover these problem in the following post as well. Array Two Sum - htDuplicate content is content that appears on the internet in more than one place. That "one place" is defined as a location with a unique website address (URL) - so, if the same content appears at more than one web address, you've got duplicate content.
Given an unsorted integer array, find the first missing positive integer. For example, Given [1,2,0] return 3, and [3,4,-1,1] return 2. Your algorithm should run in O(n) time and uses constant space. » View Solution (link to this question)