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Find All Numbers Disappeared in an Array

intermediatelayer B2 · Arrays & strings5 tests

nums has length n and every value lies in 1..n, but some values repeat and others are missing. Return every value in 1..n that does not appear, in ascending order.

  • Return an empty array when nothing is missing
  • Duplicates in the input are expected
  • Bonus: solve it without a Set, using the array itself as the bookkeeping

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