1. 1.
    -1
    ++++++++++++++++++
    ···
  2. 2.
    -1
    ++++++++++++++++++++++++++++++
    ···
  3. 3.
    -1
    +++++++++++++++++++++++++++++++++++++++
    ···
  4. 4.
    0
    ++++++++++++++++++++++++++++++++++++++++++++
    ···
  5. 5.
    -1
    +++++++++++++++++++++++++++++++++++++
    ···
  6. 6.
    -1
    ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    ···
  7. 7.
    0
    +++++++++++++++++++++++++++++++++++++
    ···
  8. 8.
    0
    +++++++++++++++++++++++++++++++++++++
    ···
  9. 9.
    0
    +++++++++++++++++++++++++++++++++++++
    ···
  10. 10.
    0
    +++++++++++++++++++++++++++++++++++++
    ···
  11. 11.
    0
    +++++++++++++++++++++++++++++++++++++
    ···
  12. 12.
    0
    +++++++++++++++++++++++++++++++++++++
    ···
  13. 13.
    0
    +++++++++++++++++++++++++++++++++++++
    ···
  14. 14.
    0
    +++++++++++++++++++++++++++++++++++++
    ···
  15. 15.
    0
    ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    ···
  16. 16.
    0
    +++++++++++++++++++++++
    ···
  17. 17.
    0
    ++++++++++++++
    ···
  18. 18.
    0
    ++++++++++++++++++++++++++++++
    ···
  19. 19.
    0
    +++++++++++++++++++++++++++++++++++++
    ···
  20. 20.
    0
    +++++++++++++++++++++++++++++++++++++++++++++++
    ···