Driver code
public static void Main ( String [ ] args ) { int [ ] in1 = { 4 , 2 , 5 , 1 , 3 , 6 } ; int [ ] pre = { 1 , 2 , 4 , 5 , 3 , 6 } ; int n = in1 . Length ; Console . WriteLine ( " Postorder ▁ traversal ▁ " ) ; printPostOrder ( in1 , pre , n ) ; } }