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);}
};