search the element which index is idx
(array []int, l, r, idx int)
| 9 | |
| 10 | // search the element which index is idx |
| 11 | func selectK(array []int, l, r, idx int) int { |
| 12 | index := partition(array, l, r) |
| 13 | if index == idx { |
| 14 | return array[index] |
| 15 | } |
| 16 | if index < idx { |
| 17 | return selectK(array, index+1, r, idx) |
| 18 | } |
| 19 | return selectK(array, l, index, idx) |
| 20 | } |
| 21 | |
| 22 | func partition(array []int, l, r int) int { |
| 23 | elem, j := array[l], l+1 |