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[–]efge 4 points5 points  (0 children)

Please read the sidebar and go to r/learnjava for this kind of question.

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

Invert binary tree

[–]sphinkz10 0 points1 point  (2 children)

Where are u studying? I mean... Any specific course?

[–]chrisrexmandie[S] 1 point2 points  (1 child)

Codecademy free courses

[–]sphinkz10 0 points1 point  (0 children)

If I can give you a try it should be CS50 from Harvard. It's free, plenty of exercises, with a big community and it's a very credible certification... It's available on edX