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.
参考代码很简短、很好:bool isBalanced(TreeNode *root)
{
return balancedHeight(root)>=0;
}
int balancedHeight(TreeNode* root)
{
if(root ==nullptr) return 0;//终止条件
int left =balancedHeight(root->left);
int right =balancedHeight(root->right);
if(left<0||right<0||abs(left-right)>1) return -1;
return max(left,right)+1;
}