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前言

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📋专栏：数据结构
🔑本章内容：手撕链式二叉树
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提示：以下是本篇文章正文内容，下面案例可供参考

🌟一、二叉树链式结构的实现

🌏1.1 二叉树叶子节点个数

💫代码：

int BTreeLeafSize(BTNode* root)
{if (root == NULL)return 0;if (root->left == NULL && root->right == NULL)return 1;return BTreeLeafSize(root->left) + BTreeLeafSize(root->right);
}

💫流程图：

🌏1.2 二叉树的高度

💫第一种写法(不支持)：

📒代码：

int BTreeHeight(BTNode* root)
{if (root == NULL)return 0;return BTreeHeight(root->left) > BTreeHeight(root->right) ?BTreeHeight(root->left) + 1 : BTreeHeight(root->right) + 1;
}

📒流程图：

由图可知，每次比较完后并没有记录数据而是再次调用当树跃高底层最大的那个函数调用的次数就越多，所以这种方法虽然对但是耗时太长，而底层也就变成了所谓的天选打工人

💫第二种写法：

📒代码：

int BTreeHeight(BTNode* root)
{if (root == NULL)return 0;int leftHeight = BTreeHeight(root->left);int rightHeight = BTreeHeight(root->right );return leftHeight > rightHeight ? leftHeight + 1 : rightHeight + 1;
}

📒流程图：

每次调用都记录上数据，这样比较完直接返回大的那个+1；

🌏1.3 二叉树第K层的节点个数

💫代码：

int BTreeLevelKSize(BTNode* root,int k)
{if (root == NULL)return 0;if (k == 1)return 1;return BTreeLevelKSize(root->left, k - 1) + BTreeLevelKSize(root->right, k - 1);
}

💫流程图：

🌏1.4 二叉树查找值为x的节点

💫第一种写法(错误示范)：

📒代码：

BTNode* BTreeFind(BTNode* root, BTDataType x)
{if (root == NULL)return NULL;if (root->data  == x)return root;BTreeFind(root->left, x);BTreeFind(root->right, x);
}

📒流程图：

💫第二种写法(正确写法)：

📒代码：

BTNode* BTreeFind(BTNode* root, BTDataType x)
{if (root == NULL)return NULL;if (root->data  == x)return root;BTNode* ret1 = BTreeFind(root->left, x);if (ret1)return ret1;BTNode* ret2 = BTreeFind(root->left, x);if (ret2)return ret2;return NULL;
}

📒流程图：

🌏1.5 层序遍历

📒代码：

void LevelOrder(BTNode* root)
{Queue q;QueueInit(&q);if (root)QueuePush(&q, root);while (!QueueEmpty(&q)){BTNode* front = QueueFront(&q);QueuePop(&q);printf("%d ", front->data);if (front->left)QueuePush(&q, front->left);if (front->right)QueuePush(&q, front->right);}printf("\n");QueueDestroy(&q);
}

📒思路流程(多种嵌套)：

对于层序遍历,可以采用队列的思想(先进先出)
具体核心思想：上一层出时带下一层进队列所以进入时不能存储树节点的值而是存储树节点指针

🌏1.6 二叉树销毁(采用后序)

📒代码：

void BTreeDestroy(BTNode* root)
{if (root == NULL)return;BTreeDestroy(root->left);BTreeDestroy(root->right);free(root);
}

📒流程图：

🌏1.7 判断二叉树是否是完全二叉树

📒代码：

bool BTreeComplete(BTNode* root)
{Queue q;QueueInit(&q);if (root)QueuePush(&q, root);while (!QueueEmpty(&q)){BTNode* front = QueueFront(&q);QueuePop(&q);//遇到空就跳出if (front == NULL)break;QueuePush(&q, front->left);QueuePush(&q, front->right);}//检查后面的节点有没有非空//有非空不是完全二叉树while (!QueueEmpty(&q)){BTNode* front = QueueFront(&q);QueuePop(&q);if (front != NULL)//往外拿数出现非空就不是完全二叉树{return false;QueueDestroy(&q);}}return true;QueueDestroy(&q);
}

📒思路流程：

和上述层序遍历一样，采用队列思想，上一层出时带下一层进入，出现NULL时跳出然后将里面的数字往外拿，出现非空不是完全二叉树>N代表空

🌟二、二叉树链式结构完整代码

//Queue.h
#pragma once
#include<assert.h>
#include<stdbool.h>
#include<stdlib.h>typedef struct BinaryTreeNode* QDataType;
typedef struct QueueNode//每个节点的结构
{struct QueueNode* next;QDataType data;
}QNode;typedef struct Queue
{QNode* phead;QNode* ptail;int size;
}Queue;//初始化
void QueueInit(Queue* pq);
//释放
void QueueDestroy(Queue* pq);
//尾插(入队)
void QueuePush(Queue* pq, QDataType x);
//头删(出队)
void QueuePop(Queue* pq);
//队头数据
QDataType QueueFront(Queue* pq);
//队尾数据
QDataType QueueBack(Queue* pq);
//数据个数
int QueueSize(Queue* pq);
//判空
bool QueueEmpty(Queue* pq);//Queue.c
#include"Queue.h"
void QueueInit(Queue* pq)
{assert(pq);pq->phead = NULL;pq->ptail = NULL;pq->size = 0;
}void QueueDestroy(Queue* pq)
{assert(pq);QNode* cur = pq->phead;while (cur){QNode* next = cur->next;free(cur);cur = next;}pq->phead = pq->ptail = NULL;pq->size = 0;
}void QueuePush(Queue* pq, QDataType x)
{assert(pq);QNode* newnode = (QNode*)malloc(sizeof(QNode));if (newnode == NULL){perror("malloc fail\n");return;}newnode->data = x;newnode->next = NULL;if (pq->ptail == NULL){assert(pq->phead == NULL);pq->phead = pq->ptail = newnode;}else{pq->ptail->next = newnode;pq->ptail = newnode;}pq->size++;
}void QueuePop(Queue* pq)
{assert(pq);assert(!QueueEmpty(pq));//一个队列if (pq->phead->next == NULL){free(pq->phead);pq->phead = NULL;pq->ptail = NULL;}//多个队列else{QNode* next = pq->phead->next;free(pq->phead);pq->phead = next;}pq->size--;
}QDataType QueueFront(Queue* pq)
{assert(pq);assert(!QueueEmpty(pq));return pq->phead->data;
}QDataType QueueBack(Queue* pq)
{assert(pq);assert(!QueueEmpty(pq));return pq->ptail->data;
}int QueueSize(Queue* pq)
{assert(pq);return pq->size;
}bool QueueEmpty(Queue* pq)
{assert(pq);return pq->size == 0;/*return pq->phead == NULL && pq->ptail == NULL;*/return pq->size == 0;
}//Test.c
#include<stdlib.h>
#include<stdio.h>
#include<assert.h>
#include"Queue.h"typedef int BTDataType;
typedef struct BinaryTreeNode
{BTDataType data;struct BinaryTreeNode* left;struct BinaryTreeNode* right;
}BTNode;BTNode* BuyNode(BTDataType x)
{BTNode* node = (BTNode*)malloc(sizeof(BTNode));if (node == NULL){perror("malloc fail");return NULL;}node->data = x;node->left = NULL;node->right = NULL;return node;
}
BTNode* CreatBinaryTree()
{BTNode* node1 = BuyNode(1);BTNode* node2 = BuyNode(2);BTNode* node3 = BuyNode(3);BTNode* node4 = BuyNode(4);BTNode* node5 = BuyNode(5);BTNode* node6 = BuyNode(6);BTNode* node7 = BuyNode(7);node1->left = node2;node1->right = node4;node2->left = node3;node4->left = node5;node4->right = node6;node5->left = node7;return node1;
}void PrevOrder(BTNode* root)
{if (root == NULL){printf("NULL ");return;}printf("%d ", root->data);PrevOrder(root->left);PrevOrder(root->right);
}void InOrder(BTNode* root)
{if (root == NULL){printf("NULL ");return;}InOrder(root->left);printf("%d ", root->data);InOrder(root->right);
}void PostOrder(BTNode* root)
{if (root == NULL){printf("NULL ");return;}PostOrder(root->left);PostOrder(root->right);printf("%d ", root->data);
}//二叉树节点个数 --- 遍历计数
//int size = 0;
//void BTreeSzie(BTNode* root)
//{
//	if (root == NULL)
//	{
//		return size;
//	}
//	size++;
//	BTreeSzie(root->left);
//	BTreeSzie(root->right);
//	return size;
//}//int BTreeSzie(BTNode* root)
//{
//	static int size = 0;
//	//printf("%p,%d\n", &size,size);
//	if (root == NULL)
//	{
//		return size;
//	}
//	size++;
//	BTreeSzie(root->left );
//	BTreeSzie(root->right );
//	return size;
//}int BTreeSzie(BTNode* root)
{return root == NULL ? 0 :BTreeSzie(root->left)+ BTreeSzie(root->right) + 1;
}//二叉树叶子节点个数
int BTreeLeafSize(BTNode* root)
{if (root == NULL)return 0;if (root->left == NULL && root->right == NULL)return 1;return BTreeLeafSize(root->left)+ BTreeLeafSize(root->right);
}//二叉树树的高度
int BTreeHeight(BTNode* root)
{if (root == NULL)return 0;int leftHeight = BTreeHeight(root->left);int rightHeight = BTreeHeight(root->right);return leftHeight > rightHeight ? leftHeight + 1 : rightHeight + 1;
}//二叉树第k层的节点个数
int BTreeLevelKSize(BTNode* root, int k)
{assert(k >= 1);if (root == NULL)return 0;if (k == 1)return 1;return BTreeLevelKSize(root->left, k - 1)+ BTreeLevelKSize(root->right, k - 1);
}//二叉树查找值为x的节点
BTNode* BTreeFind(BTNode* root, BTDataType x)
{if (root == NULL)return NULL;if (root->data == x)return root;/*BTNode* ret1 = BTreeFind(root->left, x);if (ret1)return ret1;BTNode* ret2 = BTreeFind(root->left, x);if (ret2)return ret2;return NULL;*///BTreeFind(root->left, x);//BTreeFind(root->right, x);//return NULL;BTNode* ret1 = BTreeFind(root->left, x);if (ret1)return ret1;return BTreeFind(root->left, x);
}//层序遍历---用队列
void LevelOrder(BTNode* root)
{Queue q;QueueInit(&q);if (root)QueuePush(&q, root);while (!QueueEmpty(&q)){BTNode* front = QueueFront(&q);QueuePop(&q);printf("%d ", front->data);if (front->left)QueuePush(&q, front->left);if (front->right)QueuePush(&q, front->right);}printf("\n");QueueDestroy(&q);
}void BTreeDestroy(BTNode* root)
{if (root == NULL)return;BTreeDestroy(root->left);BTreeDestroy(root->right);free(root);
}//判断二叉树是否是完全二叉树
bool BTreeComplete(BTNode* root)
{Queue q;QueueInit(&q);if (root)QueuePush(&q, root);while (!QueueEmpty(&q)){BTNode* front = QueueFront(&q);QueuePop(&q);//遇到空就跳出if (front == NULL)break;QueuePush(&q, front->left);QueuePush(&q, front->right);}//检查后面的节点有没有非空//有非空不是完全二叉树while (!QueueEmpty(&q)){BTNode* front = QueueFront(&q);QueuePop(&q);if (front != NULL){return false;QueueDestroy(&q);}}return true;QueueDestroy(&q);
}int main()
{BTNode* root = CreatBinaryTree();PrevOrder(root);printf("\n");InOrder(root);printf("\n");PostOrder(root);printf("\n");//printf("BTreeSize:%d\n", BTreeSzie(root));//printf("BTreeSize:%d\n", BTreeSzie(root));//printf("BTreeSize:%d\n", BTreeSzie(root));/*BTreeSzie(root);printf("BTreeSize:%d\n", size);size = 0;BTreeSzie(root);printf("BTreeSize:%d\n", size);size = 0;BTreeSzie(root);printf("BTreeSize:%d\n", size);*/printf("BTreeSize:%d\n", BTreeSzie(root));printf("BTreeLeafSize: % d\n", BTreeLeafSize(root));printf("BTreeHeight: % d\n", BTreeHeight(root));printf("BTreeLevelKSize: % d\n", BTreeLevelKSize(root, 3));printf("BTreeLevelKSize: % d\n", BTreeLevelKSize(root, 2));LevelOrder(root);printf("BTreeComplete: % d\n", BTreeComplete(root));BTreeDestroy(root);root = NULL;return 0;
}

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😽总结

😽Ending,今天的链式二叉树的内容就到此结束啦~，如果后续想了解更多，就请关注我吧，一键三连哦 ~