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Hacker CS: Computer Science Challenges
(
hackercs.com
)
59 points
by
hackly
on Aug 11, 2011
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past
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21 comments
Hacker CS: The Khan Academy of Computer Science.
(
hackercs.com
)
218 points
by
_2ual
on June 25, 2011
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past
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76 comments
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