Add quickselect algorithm. Quickselect is a selection algorithm to find the kth smallest element in an unordered list.

🚀 Feature

An easy to implement an algorithm that calculates range sums. It supports O(1) queries and O(n) updates.

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👍

Pitch

PSAs are a beginner-friendly algorithm that helps reinforce the understanding of arrays. I can implement this in C++ and Java (:

Assigned
@RohanK6 - Java
@itslinotlie - C++
@mavneeK - C
@aniket

Add the following check list in the PR template:

• Created a folder with the name of language you code inside directory for the day you are making the contribution to
• Added your Codes
• Tested your codes
• Added credits (author and date) at the top of the code
• Updated README.md of the day you are contributing to
• Added yourself as a contributor using `all-conri