diff --git a/problems/0104.二叉树的最大深度.md b/problems/0104.二叉树的最大深度.md index 65a155fb..4714685b 100644 --- a/problems/0104.二叉树的最大深度.md +++ b/problems/0104.二叉树的最大深度.md @@ -495,7 +495,7 @@ class solution: ## go - +### 104.二叉树的最大深度 ```go /** * definition for a binary tree node. @@ -548,6 +548,8 @@ func maxdepth(root *treenode) int { ## javascript +### 104.二叉树的最大深度 + ```javascript var maxdepth = function(root) { if (root === null) return 0; @@ -595,6 +597,8 @@ var maxDepth = function(root) { }; ``` +### 559.n叉树的最大深度 + N叉树的最大深度 递归写法 ```js var maxDepth = function(root) { @@ -627,9 +631,9 @@ var maxDepth = function(root) { }; ``` -## TypeScript: +## TypeScript -> 二叉树的最大深度: +### 104.二叉树的最大深度 ```typescript // 后续遍历(自下而上) @@ -672,7 +676,7 @@ function maxDepth(root: TreeNode | null): number { }; ``` -> N叉树的最大深度 +### 559.n叉树的最大深度 ```typescript // 后续遍历(自下而上) @@ -702,6 +706,8 @@ function maxDepth(root: TreeNode | null): number { ## C +### 104.二叉树的最大深度 + 二叉树最大深度递归 ```c int maxDepth(struct TreeNode* root){ @@ -758,7 +764,8 @@ int maxDepth(struct TreeNode* root){ ## Swift ->二叉树最大深度 +### 104.二叉树的最大深度 + ```swift // 递归 - 后序 func maxDepth1(_ root: TreeNode?) -> Int { @@ -797,7 +804,8 @@ func maxDepth(_ root: TreeNode?) -> Int { } ``` ->N叉树最大深度 +### 559.n叉树的最大深度 + ```swift // 递归 func maxDepth(_ root: Node?) -> Int { @@ -833,5 +841,84 @@ func maxDepth1(_ root: Node?) -> Int { } ``` +## Scala + +### 104.二叉树的最大深度 +递归法: +```scala +object Solution { + def maxDepth(root: TreeNode): Int = { + def process(curNode: TreeNode): Int = { + if (curNode == null) return 0 + // 递归左节点和右节点,返回最大的,最后+1 + math.max(process(curNode.left), process(curNode.right)) + 1 + } + // 调用递归方法,return关键字可以省略 + process(root) + } +} +``` + +迭代法: +```scala +object Solution { + import scala.collection.mutable + def maxDepth(root: TreeNode): Int = { + var depth = 0 + if (root == null) return depth + val queue = mutable.Queue[TreeNode]() + queue.enqueue(root) + while (!queue.isEmpty) { + val len = queue.size + for (i <- 0 until len) { + val curNode = queue.dequeue() + if (curNode.left != null) queue.enqueue(curNode.left) + if (curNode.right != null) queue.enqueue(curNode.right) + } + depth += 1 // 只要有层次就+=1 + } + depth + } +} +``` + +### 559.n叉树的最大深度 + +递归法: +```scala +object Solution { + def maxDepth(root: Node): Int = { + if (root == null) return 0 + var depth = 0 + for (node <- root.children) { + depth = math.max(depth, maxDepth(node)) + } + depth + 1 + } +} +``` + +迭代法: (层序遍历) +```scala +object Solution { + import scala.collection.mutable + def maxDepth(root: Node): Int = { + if (root == null) return 0 + var depth = 0 + val queue = mutable.Queue[Node]() + queue.enqueue(root) + while (!queue.isEmpty) { + val len = queue.size + depth += 1 + for (i <- 0 until len) { + val curNode = queue.dequeue() + for (node <- curNode.children) queue.enqueue(node) + } + } + depth + } +} +``` + -----------------------
diff --git a/problems/0111.二叉树的最小深度.md b/problems/0111.二叉树的最小深度.md index b1331659..da24480a 100644 --- a/problems/0111.二叉树的最小深度.md +++ b/problems/0111.二叉树的最小深度.md @@ -488,6 +488,46 @@ func minDepth(_ root: TreeNode?) -> Int { } ``` + +## Scala + +递归法: +```scala +object Solution { + def minDepth(root: TreeNode): Int = { + if (root == null) return 0 + if (root.left == null && root.right != null) return 1 + minDepth(root.right) + if (root.left != null && root.right == null) return 1 + minDepth(root.left) + // 如果两侧都不为空,则取最小值,return关键字可以省略 + 1 + math.min(minDepth(root.left), minDepth(root.right)) + } +} +``` + +迭代法: +```scala +object Solution { + import scala.collection.mutable + def minDepth(root: TreeNode): Int = { + if (root == null) return 0 + var depth = 0 + val queue = mutable.Queue[TreeNode]() + queue.enqueue(root) + while (!queue.isEmpty) { + depth += 1 + val len = queue.size + for (i <- 0 until len) { + val curNode = queue.dequeue() + if (curNode.left != null) queue.enqueue(curNode.left) + if (curNode.right != null) queue.enqueue(curNode.right) + if (curNode.left == null && curNode.right == null) return depth + } + } + depth + } +} +``` + rust: ```rust impl Solution { @@ -550,6 +590,7 @@ impl Solution { } min_depth } + ``` -----------------------