Project Euler has about 700 problems, but the current repository hosts solutions for only about 60-70 problems.
I'm willing to work on the issue and also if someone wants to help they can join in.
We can create guidelines on how many minimum solutions a PR should have to prevent spammy PRs with just one or two easy solutions. (open to discussion)

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Description of Change

Checklist

• Added description of change
• Added file name matches [File

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

doctest help

🚀 Feature Proposal

Adding leading zero in the question number will be an awesome feature for file explorer to sort files by the name.