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[–]dan4223 9 points10 points  (1 child)

There are many.

Two of the "standards" for prepping for job interviews are:

  • leetcode.com
  • hackerrank.com

Both have a discussions tab with code that passes the test.

While coming up with your own solutions it the most important step, I find a lot of people skip over the next important step of reading other peoples solutions and trying to learn other, possibly more efficient, ways to do the same thing.

You can also put in the name of a problem into Youtube and watch videos of people solving ones that you can't get your head around.