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  1. Prepare
  2. Algorithms
  3. Sorting
  4. Lily's Homework
  5. Discussions

Lily's Homework

  • goodengineer
     + 1 comment

    Hey, counter example here:

    5
3 4 2 1 5

    the expected output is 3, but with your logic:

    3 4 2 1 5
1 2 3 4 5
---------
1 1 1 1 0

&&

3 4 2 1 5
5 4 3 2 1
---------
1 0 1 1 1

    the output is ceil(4/2) = 2

    The flaw in your logic is that you assume that two different positions between the input array and the sorted input array are fixed with only 1 swap, when in reality it's a bit more complex than that.