[LeetCode]: 110: Balanced Binary Tree

题目：

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.

 

分析：递归的深搜，注意及时判断子树的高度差是否为1

 

代码：

    public boolean isBalanced(TreeNode root) {
        if(root==null){
            return true;
        }
        
        int intResult = caleDeep(root,1);
        
        if(intResult == 0){
            return false;
        }else{
            return true;
        }
    }
    
    public int caleDeep(TreeNode root,int intDeep){
        if(intDeep == 0){
            return 0;
        }
        
        if(root==null){
            return intDeep;
        }
        
        intDeep++;
        
        int DeepL = caleDeep(root.left,intDeep);
        
        int DeepR = caleDeep(root.right,intDeep);
        
        if(DeepL-DeepR > 1 || DeepR-DeepL > 1 ){
            return 0;
        }else{
            return DeepL>DeepR?DeepL:DeepR;
        }
    }