From 4f96f64e3d6f54eac978bdea355c22060f80d1ee Mon Sep 17 00:00:00 2001 From: jojoo15 <75017412+jojoo15@users.noreply.github.com> Date: Tue, 18 May 2021 15:59:48 +0200 Subject: [PATCH 1/5] =?UTF-8?q?Update=200530.=E4=BA=8C=E5=8F=89=E6=90=9C?= =?UTF-8?q?=E7=B4=A2=E6=A0=91=E7=9A=84=E6=9C=80=E5=B0=8F=E7=BB=9D=E5=AF=B9?= =?UTF-8?q?=E5=B7=AE.md?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit added python version of code --- .../0530.二叉搜索树的最小绝对差.md | 27 ++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-) diff --git a/problems/0530.二叉搜索树的最小绝对差.md b/problems/0530.二叉搜索树的最小绝对差.md index 903ebf78..347d66d1 100644 --- a/problems/0530.二叉搜索树的最小绝对差.md +++ b/problems/0530.二叉搜索树的最小绝对差.md @@ -177,8 +177,29 @@ class Solution { ``` Python： - - +```python +# Definition for a binary tree node. +# class TreeNode: +# def __init__(self, val=0, left=None, right=None): +# self.val = val +# self.left = left +# self.right = right +class Solution: + def getMinimumDifference(self, root: TreeNode) -> int: + res = [] + r = float("inf") + def buildaList(root): //把二叉搜索树转换成有序数组 + if not root: return None + if root.left: buildaList(root.left) //左 + res.append(root.val) //中 + if root.right: buildaList(root.right) //右 + return res + + buildaList(root) + for i in range(len(res)-1): // 统计有序数组的最小差值 + r = min(abs(res[i]-res[i+1]),r) + return r +``` Go： @@ -188,4 +209,4 @@ Go： * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw) * B站视频：[代码随想录](https://space.bilibili.com/525438321) * 知识星球：[代码随想录](https://mp.weixin.qq.com/s/QVF6upVMSbgvZy8lHZS3CQ) -
\ No newline at end of file +
From 41272638670e6da93171dfce8af63d5da42d4e36 Mon Sep 17 00:00:00 2001 From: "qingyi.liu" Date: Tue, 18 May 2021 22:51:51 +0800 Subject: [PATCH 2/5] =?UTF-8?q?=E6=B7=BB=E5=8A=A0111.=E4=BA=8C=E5=8F=89?= =?UTF-8?q?=E6=A0=91=E7=9A=84=E6=9C=80=E5=B0=8F=E6=B7=B1=E5=BA=A6=20JavaSc?= =?UTF-8?q?ript=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0111.二叉树的最小深度.md | 47 +++++++++++++++++++++++ 1 file changed, 47 insertions(+) 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 01b6c89c..5605e13d 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 @@ -302,6 +302,53 @@ class Solution: Go： +JavaScript: + +递归法： + +```javascript +/** + * @param {TreeNode} root + * @return {number} + */ +var minDepth1 = function(root) { + if(!root) return 0; + // 到叶子节点 返回 1 + if(!root.left && !root.right) return 1; + // 只有右节点时 递归右节点 + if(!root.left) return 1 + minDepth(root.right);、 + // 只有左节点时 递归左节点 + if(!root.right) return 1 + minDepth(root.left); + return Math.min(minDepth(root.left), minDepth(root.right)) + 1; +}; +``` + +迭代法： + +```javascript +/** +* @param {TreeNode} root +* @return {number} +*/ +var minDepth = function(root) { + if(!root) return 0; + const queue = [root]; + let dep = 0; + while(true) { + let size = queue.length; + dep++; + while(size--){ + const node = queue.shift(); + // 到第一个叶子节点 返回 当前深度 + if(!node.left && !node.right) return dep; + node.left && queue.push(node.left); + node.right && queue.push(node.right); + } + } +}; +``` + + ----------------------- From cf6ec4f65a8ee43a15c29f0a380cfac5f809a8dd Mon Sep 17 00:00:00 2001 From: X-shuffle <53906918+X-shuffle@users.noreply.github.com> Date: Tue, 18 May 2021 22:58:00 +0800 Subject: [PATCH 3/5] =?UTF-8?q?Update=20=E4=BA=8C=E5=8F=89=E6=A0=91?= =?UTF-8?q?=E7=9A=84=E8=BF=AD=E4=BB=A3=E9=81=8D=E5=8E=86.md?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 添加 二叉树的迭代遍历 GO版本 --- problems/二叉树的迭代遍历.md | 102 +++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) diff --git a/problems/二叉树的迭代遍历.md b/problems/二叉树的迭代遍历.md index 2647616b..d228077b 100644 --- a/problems/二叉树的迭代遍历.md +++ b/problems/二叉树的迭代遍历.md @@ -163,7 +163,109 @@ Python： Go： +> 迭代法前序遍历 +```go +//迭代法前序遍历 +/** + type Element struct { + // 元素保管的值 + Value interface{} + // 内含隐藏或非导出字段 +} + +func (l *List) Back() *Element +前序遍历：中左右 +压栈顺序：右左中 + **/ +func preorderTraversal(root *TreeNode) []int { + if root == nil { + return nil + } + var stack = list.New() + stack.PushBack(root.Right) + stack.PushBack(root.Left) + res:=[]int{} + res=append(res,root.Val) + for stack.Len()>0 { + e:=stack.Back() + stack.Remove(e) + node := e.Value.(*TreeNode)//e是Element类型，其值为e.Value.由于Value为接口，所以要断言 + if node==nil{ + continue + } + res=append(res,node.Val) + stack.PushBack(node.Right) + stack.PushBack(node.Left) + } + return res +} +``` + +> 迭代法后序遍历 + +```go +//后续遍历：左右中 +//压栈顺序：中右左(按照前序遍历思路)，再反转结果数组 +func postorderTraversal(root *TreeNode) []int { + if root == nil { + return nil + } + var stack = list.New() + stack.PushBack(root.Left) + stack.PushBack(root.Right) + res:=[]int{} + res=append(res,root.Val) + for stack.Len()>0 { + e:=stack.Back() + stack.Remove(e) + node := e.Value.(*TreeNode)//e是Element类型，其值为e.Value.由于Value为接口，所以要断言 + if node==nil{ + continue + } + res=append(res,node.Val) + stack.PushBack(node.Left) + stack.PushBack(node.Right) + } + for i:=0;i 迭代法中序遍历 + +```go +//迭代法中序遍历 +func inorderTraversal(root *TreeNode) []int { + rootRes:=[]int{} + if root==nil{ + return nil + } + stack:=list.New() + node:=root + //先将所有左节点找到，加入栈中 + for node!=nil{ + stack.PushBack(node) + node=node.Left + } + //其次对栈中的每个节点先弹出加入到结果集中，再找到该节点的右节点的所有左节点加入栈中 + for stack.Len()>0{ + e:=stack.Back() + node:=e.Value.(*TreeNode) + stack.Remove(e) + //找到该节点的右节点，再搜索他的所有左节点加入栈中 + rootRes=append(rootRes,node.Val) + node=node.Right + for node!=nil{ + stack.PushBack(node) + node=node.Left + } + } + return rootRes +} +``` From 44c8ce6a4f54869008961c62d2728548b6f24e04 Mon Sep 17 00:00:00 2001 From: X-shuffle <53906918+X-shuffle@users.noreply.github.com> Date: Wed, 19 May 2021 10:03:09 +0800 Subject: [PATCH 4/5] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20=E4=BA=8C=E5=8F=89?= =?UTF-8?q?=E6=A0=91=E7=9A=84=E8=BF=AD=E4=BB=A3=E9=81=8D=E5=8E=86=20GO?= =?UTF-8?q?=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 添加 二叉树的迭代遍历 GO版本 --- problems/二叉树的迭代遍历.md | 1 - 1 file changed, 1 deletion(-) diff --git a/problems/二叉树的迭代遍历.md b/problems/二叉树的迭代遍历.md index d228077b..10e7e7b4 100644 --- a/problems/二叉树的迭代遍历.md +++ b/problems/二叉树的迭代遍历.md @@ -268,7 +268,6 @@ func inorderTraversal(root *TreeNode) []int { ``` - ----------------------- * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw) * B站视频：[代码随想录](https://space.bilibili.com/525438321) From a57b6385c4ceccb7900cb9dc41a7eb3d6a59d2e5 Mon Sep 17 00:00:00 2001 From: X-shuffle <53906918+X-shuffle@users.noreply.github.com> Date: Wed, 19 May 2021 10:07:22 +0800 Subject: [PATCH 5/5] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20=E4=BA=8C=E5=8F=89?= =?UTF-8?q?=E6=A0=91=E7=9A=84=E8=BF=AD=E4=BB=A3=E9=81=8D=E5=8E=86=20GO?= =?UTF-8?q?=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 添加 二叉树的迭代遍历 GO版本 --- problems/二叉树的迭代遍历.md | 1 + 1 file changed, 1 insertion(+) diff --git a/problems/二叉树的迭代遍历.md b/problems/二叉树的迭代遍历.md index 10e7e7b4..a1906469 100644 --- a/problems/二叉树的迭代遍历.md +++ b/problems/二叉树的迭代遍历.md @@ -205,6 +205,7 @@ func preorderTraversal(root *TreeNode) []int { > 迭代法后序遍历 ```go +//迭代法后序遍历 //后续遍历：左右中 //压栈顺序：中右左(按照前序遍历思路)，再反转结果数组 func postorderTraversal(root *TreeNode) []int {