Added solution - LeetHub

Author: ayushnagar123

Height of Binary Tree - GFG/height-of-binary-tree.cpp

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+// { Driver Code Starts
+//Initial template for C++
+
+#include <bits/stdc++.h>
+using namespace std;
+
+struct Node
+{
+    int data;
+    struct Node *left;
+    struct Node *right;
+
+    Node(int val) {
+        data = val;
+        left = right = NULL;
+    }
+}; 
+
+// Function to Build Tree
+Node* buildTree(string str)
+{   
+    // Corner Case
+    if(str.length() == 0 || str[0] == 'N')
+            return NULL;
+    
+    // Creating vector of strings from input 
+    // string after spliting by space
+    vector<string> ip;
+    
+    istringstream iss(str);
+    for(string str; iss >> str; )
+        ip.push_back(str);
+        
+    // Create the root of the tree
+    Node *root = new Node(stoi(ip[0]));
+        
+    // Push the root to the queue
+    queue<Node*> queue;
+    queue.push(root);
+        
+    // Starting from the second element
+    int i = 1;
+    while(!queue.empty() && i < ip.size()) {
+            
+        // Get and remove the front of the queue
+        Node* currNode = queue.front();
+        queue.pop();
+            
+        // Get the current node's value from the string
+        string currVal = ip[i];
+            
+        // If the left child is not null
+        if(currVal != "N") {
+
+            // Create the left child for the current Node
+            currNode->left = new Node(stoi(currVal));
+                
+            // Push it to the queue
+            queue.push(currNode->left);
+        }
+            
+        // For the right child
+        i++;
+        if(i >= ip.size())
+            break;
+        currVal = ip[i];
+            
+        // If the right child is not null
+        if(currVal != "N") {
+                
+            // Create the right child for the current node
+            currNode->right = new Node(stoi(currVal));
+                
+            // Push it to the queue
+            queue.push(currNode->right);
+        }
+        i++;
+    }
+    
+    return root;
+}
+
+ // } Driver Code Ends
+//User function template for C++
+
+/*
+struct Node
+{
+    int data;
+    struct Node* left;
+    struct Node* right;
+    
+    Node(int x){
+        data = x;
+        left = right = NULL;
+    }
+};
+*/
+class Solution{
+    public:
+    int h = 0;
+    //Function to find the height of a binary tree.
+    int height(struct Node* node){
+        if(!node) {
+            h = 0;
+            return 0;
+        }
+        h = max({height(node->left), height(node->right)})+1;
+        return max({height(node->left), height(node->right)})+1;
+        // code here 
+    }
+};
+
+// { Driver Code Starts.
+int main()
+{
+    int t;
+	scanf("%d ",&t);
+    while(t--)
+    {
+        string treeString;
+		getline(cin,treeString);
+		Node* root = buildTree(treeString);
+        Solution ob;
+		cout<<ob.height(root)<<endl;
+    }
+    return 0;
+}  // } Driver Code Ends