Merge sort b

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  • 1. Merge sort
  • 2. Lets start with an unsorted list
  • 3. Divide the list into two lists
  • 4. Divide that list up again
  • 5. Divide that list up again
  • 6. And again...
  • 7. A single item list must be sorted
  • 8. go to the next list, a single item list must be sorted
  • 9. jj ii KK Now take that pair and merge
  • 10. jj ii KK Look down both lists taking the smallest
  • 11. jj ii KK When both lists run out you have a sorted list
  • 12. jj ii Now this pair is sorted
  • 13. Do the same with the next pair
  • 14. Each is a list of one item (so sorted)
  • 15. jj ii KK We merge again
  • 16. jj ii KK Creating a new sorted list
  • 17. Now we have two lists of pairs...
  • 18. So we merge them
  • 19. jj ii KK Look down both lists taking the smallest
  • 20. jj ii KK
  • 21. jj ii KK Look down both lists taking the smallest
  • 22. jj ii KK Look down both lists taking the smallest
  • 23. jj ii KK Look down both lists taking the smallest
  • 24. jj ii KK Look down both lists taking the smallest
  • 25. the list is sorted and you can begin the next quarter
  • 26. A single item list must be sorted
  • 27. A single item list must be sorted
  • 28. jj ii KK Merge this pair
  • 29. jj ii KK Pick the smaller item
  • 30. jj ii KK When both lists run out you have a sorted list
  • 31. Sort the next pair
  • 32. A single item list must be sorted
  • 33. A single item list must be sorted
  • 34. Merge the single item lists
  • 35. jj ii KK Merge this pair
  • 36. jj ii KK Pick the smaller item
  • 37. jj ii KK Pick the smaller item
  • 38. Now we have two lists of pairs...
  • 39. ii jj KK So we merge them
  • 40. ii jj KK Pick the smaller item
  • 41. ii jj KK Pick the smaller item
  • 42. ii jj KK Pick the smaller item
  • 43. ii jj KK Pick the smaller item
  • 44. the pairs lists are now merged
  • 45. ii jj KK Now we merge the quarters
  • 46. ii jj KK Pick the smaller item
  • 47. ii jj KK and move on
  • 48. ii jj KK Pick the smaller item
  • 49. ii jj KK and move on
  • 50. ii jj KK Pick the smaller item
  • 51. ii jj KK and move on
  • 52. ii jj KK Pick the smaller item
  • 53. ii jj KK and move on
  • 54. The first half is now sorted