mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 01:46:27 +08:00
69 lines
1.6 KiB
C++
69 lines
1.6 KiB
C++
/**
|
|
* File: binary_tree_dfs.cpp
|
|
* Created Time: 2022-11-25
|
|
* Author: Krahets (krahets@163.com)
|
|
*/
|
|
|
|
#include "../utils/common.hpp"
|
|
|
|
// 初始化列表，用于存储遍历序列
|
|
vector<int> vec;
|
|
|
|
/* 前序遍历 */
|
|
void preOrder(TreeNode *root) {
|
|
if (root == nullptr)
|
|
return;
|
|
// 访问优先级：根节点 -> 左子树 -> 右子树
|
|
vec.push_back(root->val);
|
|
preOrder(root->left);
|
|
preOrder(root->right);
|
|
}
|
|
|
|
/* 中序遍历 */
|
|
void inOrder(TreeNode *root) {
|
|
if (root == nullptr)
|
|
return;
|
|
// 访问优先级：左子树 -> 根节点 -> 右子树
|
|
inOrder(root->left);
|
|
vec.push_back(root->val);
|
|
inOrder(root->right);
|
|
}
|
|
|
|
/* 后序遍历 */
|
|
void postOrder(TreeNode *root) {
|
|
if (root == nullptr)
|
|
return;
|
|
// 访问优先级：左子树 -> 右子树 -> 根节点
|
|
postOrder(root->left);
|
|
postOrder(root->right);
|
|
vec.push_back(root->val);
|
|
}
|
|
|
|
/* Driver Code */
|
|
int main() {
|
|
/* 初始化二叉树 */
|
|
// 这里借助了一个从数组直接生成二叉树的函数
|
|
TreeNode *root = vecToTree(vector<int>{1, 2, 3, 4, 5, 6, 7});
|
|
cout << endl << "初始化二叉树\n" << endl;
|
|
printTree(root);
|
|
|
|
/* 前序遍历 */
|
|
vec.clear();
|
|
preOrder(root);
|
|
cout << endl << "前序遍历的节点打印序列 = ";
|
|
printVector(vec);
|
|
|
|
/* 中序遍历 */
|
|
vec.clear();
|
|
inOrder(root);
|
|
cout << endl << "中序遍历的节点打印序列 = ";
|
|
printVector(vec);
|
|
|
|
/* 后序遍历 */
|
|
vec.clear();
|
|
postOrder(root);
|
|
cout << endl << "后序遍历的节点打印序列 = ";
|
|
printVector(vec);
|
|
|
|
return 0;
|
|
}
|