Problems
Tree PostOrder Traversal
Tree PostOrder Traversal
Implement a PostOrder traversal of a tree. In this traversal the left subtree is visited first, then the the right subtree and finally the root node.
Definition of a tree:
// Java
class TreeNode
{
public:
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
left = NULL;
right = NULL;
};
// C++
class TreeNode
{
public:
int val;
TreeNode *left;
TreeNode *right;
TreeNode(int x) : val(x), left(NULL), right(NULL) {}
};
Implement function PostOrder that prints in one line the vertices of the tree in order of PostOrder traversal. Separate the vertices with one space.
// Java
void PostOrder(TreeNode tree)
// C++
void Postrder(TreeNode *tree)
Example
During the PostOrder traversal vertices will be printed in the next order: 1 3 2 9 16 10 4.