之前没有通过的样例

return语句只写了一个

return abs(l-r)<=1

缺少了

isBalanced(root->left)&&isBalanced(root->right);

补上就好了

class Solution {
public:
    bool isBalanced(TreeNode* root) {
        if(!root){
            return true;
        }
        int l=getHeight(root->left);
        int r=getHeight(root->right);
        return abs(l-r)<=1&&isBalanced(root->left)&&isBalanced(root->right);
    }
    int getHeight(TreeNode* node){
        if(!node){
            return 0;
        }
        int l=1+getHeight(node->left);
        int r=1+getHeight(node->right);
        return max(l,r);
    }
};