Given a binary tree, you need to compute the length of the diameter of the tree. The diameter of a binary tree is the length of the longest path between any two nodes in a tree. This path may or may not pass through the root.
Example: Given a binary tree 1 / \ 2 3 / \ 4 5 Return 3, which is the length of the path [4,2,1,3] or [5,2,1,3].
Note: The length of path between two nodes is represented by the number of edges between them.
/**
* Definition for a binary tree node.
* public class TreeNode {
* public int val;
* public TreeNode left;
* public TreeNode right;
* public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
public class Solution {
int maxDiameter = 0;
public int DiameterOfBinaryTree(TreeNode root) {
Height(root);
return maxDiameter;
}
private int Height(TreeNode root){
if(root==null){
return 0;
}
int left = Height(root.left);
int right = Height(root.right);
maxDiameter = Math.Max(maxDiameter,left+right);
return 1+Math.Max(left,right);
}
}Time Complexity: O(n)
Space Complexity: O(1)
