Good luck

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Across
  1. 4. Promotion of Hollow knight
  2. 8. Someone who was happy in Niger
  3. 9. Couple of words
  4. 10. What should take 5-7 minutes
  5. 11. x^2
Down
  1. 1. The brother of unfair pronunciation word
  2. 2. So, f(n) = (p-1)(q-1) + ...?
  3. 3. ++
  4. 5. Definition of A in LCA algorithm
  5. 6. Dorm but i nerd
  6. 7. Some that contains time machine but in short