Create Determine if Two Trees are Identical

Determine if Two Trees are Identical

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+// { Driver Code Starts
+#include <bits/stdc++.h>
+using namespace std;
+
+struct Node
+{
+    int data;
+    struct Node *left;
+    struct Node *right;
+
+    Node(int x){
+        data = x;
+        left = NULL;
+        right = NULL;
+    }
+};
+
+bool isIdentical(Node* a, Node* b);
+
+// 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;
+}
+
+int main() {
+    int tc;
+    scanf("%d ", &tc);
+    while (tc--) {
+        string str, str1;
+        getline(cin, str);
+        Node *rootA = buildTree(str);
+        getline(cin, str1);
+        Node *rootB = buildTree(str1);
+        if (isIdentical(rootA, rootB)) {
+            cout << "Yes\n";
+        } else {
+            cout << "No\n";
+        }
+    }
+    return 0;
+}// } Driver Code Ends
+
+
+/* A binary tree node
+
+
+struct Node
+{
+    int data;
+    struct Node* left;
+    struct Node* right;
+
+    Node(int x){
+        data = x;
+        left = right = NULL;
+    }
+};
+*/
+
+/* Should return true if trees with roots as r1 and 
+r2 are identical */
+vector<int> v1,v2;
+void f1(Node * r1){
+    if(!r1)return;
+    f1(r1->left);
+    v1.push_back(r1->data);
+    f1(r1->right);
+}
+void f2(Node * r2){
+    if(!r2)return;
+    f2(r2->left);
+    v2.push_back(r2->data);
+    f2(r2->right);
+}
+bool isIdentical(Node *r1, Node *r2)
+{
+    //Your Code here
+    f1(r1);f2(r2);
+    if(v1.size()!=v2.size()){v1.clear();v2.clear();return false;}
+    else{
+       for(int i=0;i<v1.size();i++){
+        if(v1[i]!=v2[i]){v1.clear();v2.clear();return false;}
+       }
+    v1.clear();v2.clear();
+    return true;
+    }
+
+}