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leetcode 0110

admin 11月 13, 2020 0

Desicription

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.

Solution


 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class  {
private:
    int depth(TreeNode* root) {
        if(root == NULL)
            return 0;
        return max(depth(root->left), depth(root->right)) + 1;
    }
public:
    bool isBalanced(TreeNode* root) {
        if(root == NULL)
            return 1;
        int left = depth(root->left);
        int right = depth(root->right);
        return (abs(left-right) <= 1) && isBalanced(root->left) && isBalanced(root->right);
    }
};