classSolution{publicbooleanisBalanced(TreeNode root){if(root ==null)returntrue;if(Math.abs(height(root.left) - height(root.right)) >1) {returnfalse; }returnisBalanced(root.left) && isBalanced(root.right); }privateintheight(TreeNode root){if(root ==null)return0;returnMath.max(height(root...
https://github.com/grandyang/leetcode/issues/958 参考资料: https://leetcode.com/problems/check-completeness-of-a-binary-tree/ https://leetcode.com/problems/check-completeness-of-a-binary-tree/discuss/205682/JavaC%2B%2BPython-BFS-Level-Order-Traversal https://leetcode.com/problems/check-complet...
Definition of a complete binary tree fromWikipedia: In a complete binary tree every level, except possibly the last, is completely filled, and all nodes in the last level are as far left as possible. It can have between 1 and 2h nodes inclusive at the last level h. Example 1: Input:[...
* Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode() : val(0), left(nullptr), right(nullptr) {} * TreeNode(int x) : val(x), left(nullptr), right(nullptr) {} * TreeNode(int x, TreeNode *left, TreeNode ...
sets. Self-balancing binary search tree AVL trees In practice: From what I can tell these aren't used much in practice, butI could see where they would be: The AVL tree is another structure supporting O(log n) search, insertion and removal. It is more rigidly balanced thanred–...
int GetDepth(TreeNode *root) {if(root == NULL)return0;returnmax(GetDepth(root->left), GetDepth(root->right)) +1; } bool GetAns(TreeNode *root, int dep) {//只有根节点的情况,不用判空,因为不会递归到那if(dep == depth) {returntrue; ...
1classSolution2{3public:4boolisCompleteTree(TreeNode*root)5{6if(root ==NULL)7returnfalse;89queue<TreeNode *>q;10q.push(root);11boolmustHaveNoChild =false;12boolresult =true;13while(!q.empty())14{15TreeNode* pNode =q.front();16q.pop();17if(mustHaveNoChild)//如果一个节点没有子...
In a complete binary tree every level, except possibly the last, is completely filled, and all nodes in the last level are as far left as possible. It can have between 1 and 2h nodes inclusive at the last level h. Example 1: