mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 12:06:29 +08:00
4d9bbe72e1
* style(kotlin): Make code and comments consistent. * style(kotlin): convert comment location. * style(c): Add missing comment. * style(kotlin): Remove redundant semicolon, parenthesis and brace * style(kotlin): Put constants inside the function. * style(kotlin): fix unnecessary indentation. * style(swift): Add missing comment. * style(kotlin): Add missing comment. * style(kotlin): Remove redundant comment. * style(kotlin): Add missing comment. * Update linked_list.kt * style(csharp,js,ts): Add missing comment. * style(kotlin): Remove empty lines. * Update list.cs * Update list.js * Update list.ts * roll back to commit 1 * style(cs,js,ts): Add missing comment in docfile. * style(kotlin): Use normal element swapping instead of scope functions.
64 lines
No EOL
1.5 KiB
Kotlin
64 lines
No EOL
1.5 KiB
Kotlin
/**
|
|
* File: binary_tree_dfs.kt
|
|
* Created Time: 2024-01-25
|
|
* Author: curtishd (1023632660@qq.com)
|
|
*/
|
|
|
|
package chapter_tree
|
|
|
|
import utils.TreeNode
|
|
import utils.printTree
|
|
|
|
// 初始化列表，用于存储遍历序列
|
|
var list = mutableListOf<Int>()
|
|
|
|
/* 前序遍历 */
|
|
fun preOrder(root: TreeNode?) {
|
|
if (root == null) return
|
|
// 访问优先级：根节点 -> 左子树 -> 右子树
|
|
list.add(root._val)
|
|
preOrder(root.left)
|
|
preOrder(root.right)
|
|
}
|
|
|
|
/* 中序遍历 */
|
|
fun inOrder(root: TreeNode?) {
|
|
if (root == null) return
|
|
// 访问优先级：左子树 -> 根节点 -> 右子树
|
|
inOrder(root.left)
|
|
list.add(root._val)
|
|
inOrder(root.right)
|
|
}
|
|
|
|
/* 后序遍历 */
|
|
fun postOrder(root: TreeNode?) {
|
|
if (root == null) return
|
|
// 访问优先级：左子树 -> 右子树 -> 根节点
|
|
postOrder(root.left)
|
|
postOrder(root.right)
|
|
list.add(root._val)
|
|
}
|
|
|
|
/* Driver Code */
|
|
fun main() {
|
|
/* 初始化二叉树 */
|
|
// 这里借助了一个从列表直接生成二叉树的函数
|
|
val root = TreeNode.listToTree(mutableListOf(1, 2, 3, 4, 5, 6, 7))
|
|
println("\n初始化二叉树\n")
|
|
printTree(root)
|
|
|
|
/* 前序遍历 */
|
|
list.clear()
|
|
preOrder(root)
|
|
println("\n前序遍历的节点打印序列 = $list")
|
|
|
|
/* 中序遍历 */
|
|
list.clear()
|
|
inOrder(root)
|
|
println("\n中序遍历的节点打印序列 = $list")
|
|
|
|
/* 后序遍历 */
|
|
list.clear()
|
|
postOrder(root)
|
|
println("\n后序遍历的节点打印序列 = $list")
|
|
} |