LeetCode:Balanced Binary Tree

Balanced Binary Tree

Total Accepted: 114121  Total Submissions: 332812  Difficulty: Easy

Given a binary tree, determine if it is height-balanced.

For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the 

two subtrees of every node never differ by more than 1.

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c++ code:

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
public:
    bool isBalanced(TreeNode* root) {
        return balandeTree(root) != -1;
    }
    
    int balandeTree(TreeNode *root) {
        if(NULL == root) return 0;
        int lh = balandeTree(root->left);
        int rh = balandeTree(root->right);
        if(-1 == lh || -1 == rh || abs(lh-rh)>1)
            return -1;
        else
            return max(lh,rh) + 1;
    }
};