Free algorithm tools or service for developers

A collection of free algorithm app, tools or service for developers

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Codeforces. Programming competitions and contests, programming community

Tags: algorithm, learning-resource, code-practice

Free Offer:

free problem set, free course
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Project Euler

Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve

Tags: learning-resource, code-practice, algorithm