规范格式

leetcode/0145.Binary-Tree-Postorder-Traversal/145. Binary Tree Postorder Traversal.go

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+package leetcode
+
+import (
+	"github.com/halfrost/LeetCode-Go/structures"
+)
+
+// TreeNode define
+type TreeNode = structures.TreeNode
+
+/**
+ * Definition for a binary tree node.
+ * type TreeNode struct {
+ *     Val int
+ *     Left *TreeNode
+ *     Right *TreeNode
+ * }
+ */
+
+func postorderTraversal(root *TreeNode) []int {
+	var result []int
+	postorder(root, &result)
+	return result
+}
+
+func postorder(root *TreeNode, output *[]int) {
+	if root != nil {
+		postorder(root.Left, output)
+		postorder(root.Right, output)
+		*output = append(*output, root.Val)
+	}
+}

leetcode/0145.Binary-Tree-Postorder-Traversal/145. Binary Tree Postorder Traversal_test.go

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+package leetcode
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/halfrost/LeetCode-Go/structures"
+)
+
+type question145 struct {
+	para145
+	ans145
+}
+
+// para 是参数
+// one 代表第一个参数
+type para145 struct {
+	one []int
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans145 struct {
+	one []int
+}
+
+func Test_Problem145(t *testing.T) {
+
+	qs := []question145{
+
+		question145{
+			para145{[]int{}},
+			ans145{[]int{}},
+		},
+
+		question145{
+			para145{[]int{1}},
+			ans145{[]int{1}},
+		},
+
+		question145{
+			para145{[]int{1, structures.NULL, 2, 3}},
+			ans145{[]int{1, 2, 3}},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 145------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans145, q.para145
+		fmt.Printf("【input】:%v      ", p)
+		root := structures.Ints2TreeNode(p.one)
+		fmt.Printf("【output】:%v      \n", postorderTraversal(root))
+	}
+	fmt.Printf("\n\n\n")
+}

leetcode/0145.Binary-Tree-Postorder-Traversal/README.md

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+# [145. Binary Tree Postorder Traversal](https://leetcode.com/problems/binary-tree-postorder-traversal/)
+
+## 题目
+
+
+Given a binary tree, return the postorder traversal of its nodes' values.
+
+
+
+Example :
+
+```c
+Input: [1,null,2,3]
+   1
+    \
+     2
+    /
+   3
+
+Output: [3,2,1]
+```
+
+
+Follow up: Recursive solution is trivial, could you do it iteratively?
+
+
+ 
+
+## 题目大意
+
+后根遍历一颗树。
+
+## 解题思路
+
+递归的实现方法，见代码。
+
+
+