二叉树的创建与遍历 c
时间: 2023-12-18 22:04:58 浏览: 43
以下是C语言中二叉树的创建与遍历的示例代码:
1. 二叉树的创建
```c
#include <stdio.h>
#include <stdlib.h>
struct TreeNode {
int val;
struct TreeNode *left;
struct TreeNode *right;
};
struct TreeNode* createTree() {
int val;
scanf("%d", &val);
if (val == -1) { // -1表示该节点为空
return NULL;
}
struct TreeNode *node = (struct TreeNode*)malloc(sizeof(struct TreeNode));
node->val = val;
node->left = createTree();
node->right = createTree();
return node;
}
```
2. 二叉树的先序遍历
```c
void preorderTraversal(struct TreeNode* root) {
if (root == NULL) {
return;
}
printf("%d ", root->val);
preorderTraversal(root->left);
preorderTraversal(root->right);
}
```
3. 二叉树的中序遍历
```c
void inorderTraversal(struct TreeNode* root) {
if (root == NULL) {
return;
}
inorderTraversal(root->left);
printf("%d ", root->val);
inorderTraversal(root->right);
}
```
4. 二叉树的后序遍历
```c
void postorderTraversal(struct TreeNode* root) {
if (root == NULL) {
return;
}
postorderTraversal(root->left);
postorderTraversal(root->right);
printf("%d ", root->val);
}
```
5. 二叉树的层次遍历
```c
void levelorderTraversal(struct TreeNode* root) {
if (root == NULL) {
return;
}
struct TreeNode* queue[1000];
int front = 0, rear = 0;
queue[rear++] = root;
while (front < rear) {
struct TreeNode* node = queue[front++];
printf("%d ", node->val);
if (node->left != NULL) {
queue[rear++] = node->left;
}
if (node->right != NULL) {
queue[rear++] = node->right;
}
}
}
```
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