Problem Solving Meetup - October 9th

Questions for the 9th October, 2018 - online meetup

Note:Regardless of whether you are new to ds/algo prep or are a seasoned veteran looking for practice, consider following this approach it may help organize your thoughts. Grab a fresh notebookFrom the front of the notebook, solve problem and as you solveWrite down the questionWrite down the date/time of when you started and finished.Once you solve, review your answer and reflect the solution.Write that down at the back of the notebook on what clues/hints could have made you solve this faster.Write down any revelations and hints. Now on with the questions: Q1. N-SUM Questions: Questions based on finding elements in an unordered array of integers.
a. Classic 2SUM problem: Given an unordered array of integers, find two numbers that add up to a given target number.
Leetcode link for reference:
b. Extend 2SUM solution above to 3SUM .. 4SUM?
Followup questions: What is the Big O  (Time and Space)…
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