面试题39 二叉树的深度
题目描述
输入一棵二叉树,求该树的深度。从根结点到叶结点依次经过的结点(含根、叶结点)形成树的一条路径,最长路径的长度为树的深度。
1 /* 2 struct TreeNode { 3 int val; 4 struct TreeNode *left; 5 struct TreeNode *right; 6 TreeNode(int x) : 7 val(x), left(NULL), right(NULL) { 8 } 9 };*/ 10 class Solution { 11 public: 12 int TreeDepth(TreeNode* pRoot) 13 { 14 if (pRoot == NULL) 15 return 0; 16 int left = TreeDepth(pRoot->left); 17 int right = TreeDepth(pRoot->right); 18 return left > right ? left + 1 : right + 1; 19 } 20 };
题目描述
输入一棵二叉树,判断该二叉树是否是平衡二叉树。
1 class Solution { 2 public: 3 4 bool IsBalanced(TreeNode* pRoot, int &depth) { 5 if (pRoot == NULL){ 6 depth = 0; 7 return true; 8 } 9 int left, right; 10 if (IsBalanced(pRoot->left, left) && IsBalanced(pRoot->right, right)){ 11 if (abs(left - right) <= 1){ 12 depth = left > right ? left + 1 : right + 1; 13 return true; 14 } 15 } 16 return false; 17 } 18 19 bool IsBalanced_Solution(TreeNode* pRoot) { 20 int depth = 0; 21 return IsBalanced(pRoot, depth); 22 } 23 };