http://www.itint5.com/oj/#4 这题是利用完全二叉树的性质计算节点数目.那么是通过比较左右子树的最左结点的高度来看那边是满的,然后递归计算. //使用getLeftChildNode(TreeNode)获得左儿子结点 //使用getRightChildNode(TreeNode)获得右儿子结点 //使用isNullNode(TreeNode)判断结点是否为空 int get_left_height(TreeNode root) { if (isNullNode(root)…

#include "stdio.h" #include "string.h" #include "malloc.h" #define NULL 0 #define MAXSIZE 30 typedef struct BiTNode      //定义二叉树数据结构 {     char data;     struct BiTNode *lchild,*rchild; } BiTNode; void preCreate(BiTNode *&…

Given a complete binary tree, count the number of nodes. Definition of a complete binary tree from Wikipedia: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 pos…

Given a complete binary tree, count the number of nodes. Definition of a complete binary tree from Wikipedia: 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 po…

Given a complete binary tree, count the number of nodes. Note: Definition of a complete binary tree from Wikipedia: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…

Given a complete binary tree, count the number of nodes. Note: Definition of a complete binary tree from Wikipedia: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…

统计每层的叶子节点个数建树,然后dfs即可 #include <iostream> #include <cstdio> #include <algorithm> #include <cstring> #include <vector> using namespace std; /* 统计每层的叶子节点个数 建树,然后dfs即可 */ ; int n,m; int layer[maxn]; //统计每层的叶子节点个数 ; vector<int…

给出一个完全二叉树,求出该树的节点个数. 说明: 完全二叉树的定义如下:在完全二叉树中,除了最底层节点可能没填满外,其余每层节点数都达到最大值,并且最下面一层的节点都集中在该层最左边的若干位置.若最底层为第 h 层,则该层包含 1~ 2h 个节点. 示例: 输入: 1 / \ 2 3 / \ / 4 5 6 输出: 6 转别人解法: class Solution { public int countNodes(TreeNode root) { /** 完全二叉树的高度可以直接通过不断地访问左子树…

package my_basic.class_4; public class Code_08_CBTNode { // 完全二叉树的节点个数 复杂度低于O(N) public static class Node { int value; Node left; Node right; public Node(int value) { this.value = value; }; } public static int nodeNum(Node head) { if (head == null) {…

完全二叉树的节点个数 给出一个完全二叉树,求出该树的节点个数. 说明: 完全二叉树的定义如下:在完全二叉树中,除了最底层节点可能没填满外,其余每层节点数都达到最大值,并且最下面一层的节点都集中在该层最左边的若干位置.若最底层为第 h 层,则该层包含 1~ 2h 个节点. 示例: 输入: 输出: 6 public class Solution { // 获取左子树的高度(其实是最左侧分支) public int getLeftHeight(TreeNode root) { int count =…