Create DiameterBinaryTree.cpp

Author: anshulbh9

DiameterBinaryTree.cpp

@@ -0,0 +1,31 @@
+/**
+ * Definition for a binary tree node.
+ * struct TreeNode {
+ *     int val;
+ *     TreeNode *left;
+ *     TreeNode *right;
+ *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
+ * };
+ */
+class Solution {
+public:
+    int height(TreeNode*root){
+        if(root==NULL){
+            return 0;
+        }
+        return max(height(root->left),height(root->right))+1;
+    }
+    int diameterOfBinaryTree(TreeNode* root) {
+        if(root==NULL){
+            return 0;
+        }
+         int dia=height(root->left)+height(root->right);
+        int leftDia=diameterOfBinaryTree(root->left);
+        int rightDia=diameterOfBinaryTree(root->right);
+        int ans=max(leftDia,rightDia);
+        ans=max(ans,dia);
+        return ans;
+    }
+};