[LeetCode]Balanced Binary Tree

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.

這道題以前整理過，這裡就不細寫了，直接貼上代碼：

/**
 * Definition for binary tree
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
public:
    bool fun(TreeNode* root,int& depth){
        if(root==NULL){
            depth=0;
            return true;
        }
        int left,right;
        if(fun(root->left,left)&&fun(root->right,right)){
            int diff=left-right;
            if(abs(diff)<=1){
                depth=1+(left>right?left:right);
                return true;
            }
        }
        return false;
    }
    bool isBalanced(TreeNode *root) {
        int depth=0;
        return fun(root,depth);
    }
};

下面是以前整理的鏈接：平衡二叉樹的判斷