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Separate even and odd integers in a given array

Objec­tive:  Given an array which con­tains even and odd inte­gers. Write an algo­rithm to sep­a­rate even and odd numbers.


int [] arrA = {1,2,3,4,6,8,7,12};
Output: [12, 2, 8, 4, 6, 3, 7, 1]

Approach: Swap­ping Indexes

  • Use two indexes, left and right.
  • Put left index at the start of array and right at the end of the array.
  • Incre­ment left till odd num­ber is not found.
  • Decre­ment right till even num­ber is not found.
  • Swap left and right elements
  • Do it till left<right

Time Com­plex­ity: O(n)



Rearranging arrays using left and right indexes
[12, 2, 8, 4, 6, 3, 7, 1]

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