geeksForGeeksSolutions/checkForBalancedTree.cpp at master · kk77777/geeksForGeeksSolutions · GitHub

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// { Driver Code Starts
#include <bits/stdc++.h>
using namespace std;

struct Node
{
    int data;
    struct Node *left;
    struct Node *right;
};
// Utility function to create a new Tree Node
Node *newNode(int val)
{
    Node *temp = new Node;
    temp->data = val;
    temp->left = NULL;
    temp->right = NULL;

    return temp;
}
// 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 = newNode(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 = newNode(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 = newNode(stoi(currVal));

            // Push it to the queue
            queue.push(currNode->right);
        }
        i++;
    }

    return root;
}

bool isBalanced(Node *root);

int main()
{

    int t;
    scanf("%d ", &t);
    while (t--)
    {
        string s;
        getline(cin, s);
        Node *root = buildTree(s);
        cout << isBalanced(root) << endl;
    }
    return 1;
} // } Driver Code Ends

/* A binary tree node structure

struct Node
{
    int data;
    struct Node* left;
    struct Node* right;

    Node(int x){
        data = x;
        left = right = NULL;
    }
};
 */

int checkHeight(Node *root, bool &ans)
{
    if (root == NULL || ans == false)
        return 0;
    int lh = checkHeight(root->left, ans);
    int rh = checkHeight(root->right, ans);
    if (abs(lh - rh) > 1)
    {
        ans = false;
    }
    return 1 + max(lh, rh);
}

//Function to check whether a binary tree is balanced or not.
bool isBalanced(Node *root)
{
    //  Your Code here
    if (root == NULL)
        return true;
    bool ans = true;
    checkHeight(root, ans);
    return ans;
}