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LeetCode
Discontinued This is my LeetCode solutions for all 2000+ problems, mainly written in C++ or Python. (by lyhsieh)
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Leetcode.com for problem solving practice. Do basics first before jumping into this one. Similar thing you can do at topcoder.com for trying to code with a timer. Great for problem solving practice.
Thanks for this extensive guide, glad to see that I'm already on the right track. I plan to build a file-sharing program through wifi using a web interface. the same idea as this website www.sharedrop.io