Create mirror_tree.cpp

CPP/mirror_tree.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+
+/* A binary tree node has data, pointer to left child
+   and a pointer to right child */
+struct Node
+{
+    int data;
+    struct Node* left;
+    struct Node* right;
+
+    Node(int x){
+        data = x;
+        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;
+}
+
+void mirror(struct Node* node);
+
+/* Helper function to test mirror(). Given a binary
+   search tree, print out its data elements in
+   increasing sorted order.*/
+void inOrder(struct Node* node)
+{
+  if (node == NULL)
+    return;
+
+  inOrder(node->left);
+  printf("%d ", node->data);
+
+  inOrder(node->right);
+}
+
+
+
+/* Driver program to test size function*/
+int main() {
+    int tc;
+    scanf("%d ", &tc);
+    while (tc--) {
+        string str;
+        getline(cin, str);
+        Node *root = buildTree(str);
+        mirror(root);
+        inOrder(root);
+        cout << "\n";
+    }
+
+
+    return 0;
+}// } Driver Code Ends
+
+
+//function Template for C++
+
+/* A binary tree node has data, pointer to left child
+   and a pointer to right child /
+struct Node
+{
+    int data;
+    struct Node* left;
+    struct Node* right;
+
+    Node(int x){
+        data = x;
+        left = right = NULL;
+    }
+}; */
+
+/* Should convert tree to its mirror */
+Node* temp=new Node(0);
+
+void mirror(Node* node) 
+{
+    if(node==NULL)
+        return ;
+    mirror(node->left);
+    //👀 👀 we do not calculate temp here as the value of temp changes in every
+    //recursion call stack state
+    mirror(node->right);
+
+    if(node->left&&node->right)
+    {
+         temp=node->left;  
+         node->left=node->right;
+         node->right=temp;
+
+    }
+    else if(!node->left&&node->right)
+    {
+
+        node->left=node->right;
+        node->right=NULL;
+    }
+     else if(node->left&&!node->right)
+    {
+
+        node->right=node->left;
+        node->left=NULL;
+    }
+     // Your Code Here
+}