Selection sort on [22 10 15 3 8 2]
  round 1: smallest is 2 (was at index 5) -> [2 10 15 3 8 22]
  round 2: smallest is 3 (was at index 3) -> [2 3 15 10 8 22]
  round 3: smallest is 8 (was at index 4) -> [2 3 8 10 15 22]
  round 4: smallest is 10 (was at index 3) -> [2 3 8 10 15 22]
  round 5: smallest is 15 (was at index 4) -> [2 3 8 10 15 22]
  comparisons = 15, swaps = 3
