if you're learning DSA, 3 free sites that actually make algorithms make sense🔖
http://CSVisTool.com — watch algorithms run step by step instead of just imagining them
http://VisuAlgo.net — my favorite honestly, covers almost everything, trees graphs stacks queues all animated
http://cs.usfca.edu/~galles/visualization — this one you control step by step yourself, good for really understanding what's happening
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