scala LeetCode

c04b223d · 梦境迷离 · bd2dc808 · c04b223d
隐藏空白更改
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Showing with 1 addition and 2 deletion

leetcode/src/main/scala/io/github/dreamylost/Interview_27.scala ...de/src/main/scala/io/github/dreamylost/Interview_27.scala +1 -2

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--- a/leetcode/src/main/scala/io/github/dreamylost/Interview_27.scala
+++ b/leetcode/src/main/scala/io/github/dreamylost/Interview_27.scala
@@ -12,12 +12,11 @@ object Interview_27 extends App {
  def mirrorTree(root: TreeNode): TreeNode = {
    import scala.collection.mutable
    val queue = mutable.Queue[TreeNode]()
-    var left: TreeNode = null
    queue.enqueue(root)
    while (queue.nonEmpty) {
      val tmp = queue.dequeue()
      if (tmp != null) {
-        left = tmp.left
+        val left = tmp.left
        tmp.left = tmp.right
        tmp.right = left
        queue.enqueue(tmp.right)