mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 14:16:28 +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.
42 lines
No EOL
1.1 KiB
Kotlin
42 lines
No EOL
1.1 KiB
Kotlin
/**
|
|
* File: binary_tree_bfs.kt
|
|
* Created Time: 2024-01-25
|
|
* Author: curtishd (1023632660@qq.com)
|
|
*/
|
|
|
|
package chapter_tree
|
|
|
|
import utils.TreeNode
|
|
import utils.printTree
|
|
import java.util.*
|
|
|
|
/* 层序遍历 */
|
|
fun levelOrder(root: TreeNode?): MutableList<Int> {
|
|
// 初始化队列，加入根节点
|
|
val queue = LinkedList<TreeNode?>()
|
|
queue.add(root)
|
|
// 初始化一个列表，用于保存遍历序列
|
|
val list = mutableListOf<Int>()
|
|
while (queue.isNotEmpty()) {
|
|
val node = queue.poll() // 队列出队
|
|
list.add(node?._val!!) // 保存节点值
|
|
if (node.left != null)
|
|
queue.offer(node.left) // 左子节点入队
|
|
if (node.right != null)
|
|
queue.offer(node.right) // 右子节点入队
|
|
}
|
|
return list
|
|
}
|
|
|
|
/* 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)
|
|
|
|
/* 层序遍历 */
|
|
val list = levelOrder(root)
|
|
println("\n层序遍历的节点打印序列 = $list")
|
|
} |