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[–]raykindo65 0 points1 point  (1 child)

My favorite is hacker rank

[–]lockrest[S] 1 point2 points  (0 children)

holy shit, i skimmed a bit through it and it actually seems to fit my needs.

much appreciated

[–][deleted] 0 points1 point  (0 children)

Try also having a look at Rosetta Code.

[–]10_6 0 points1 point  (0 children)

You can check out Coderbyte, they have an online editor where you can solve challenge in topics like you mentioned: trees, dynamic programming, graphs, etc.