Add solution and test-cases for problem 559

Author: 0xff-dev

leetcode/501-600/0559.Maximum-Depth-of-N-ary-Tree/README.md

@@ -1,28 +1,29 @@
 # [559.Maximum Depth of N-ary Tree][title]
 
-> [!WARNING|style:flat]
-> This question is temporarily unanswered if you have good ideas. Welcome to [Create Pull Request PR](https://github.com/kylesliu/awesome-golang-algorithm)
-
 ## Description
+Given a n-ary tree, find its maximum depth.
+
+The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.
+
+Nary-Tree input serialization is represented in their level order traversal, each group of children is separated by the null value (See examples).
 
-**Example 1:**
+**Example 1:**  
+
+![1](./narytreeexample.png)
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: root = [1,null,3,2,4,null,5,6]
+Output: 3
 ```
 
-## 题意
-> ...
+**Example 2:**  
 
-## 题解
+![2](./sample_4_964.png)
 
-### 思路1
-> ...
-Maximum Depth of N-ary Tree
-```go
 ```
-
+Input: root = [1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,null,13,null,null,14]
+Output: 5
+```
 
 ## 结语
 

leetcode/501-600/0559.Maximum-Depth-of-N-ary-Tree/Solution.go

@@ -1,5 +1,17 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+type Node struct {
+	Val      int
+	Children []*Node
+}
+
+func Solution(root *Node) int {
+	if root == nil {
+		return 0
+	}
+	dep := 0
+	for _, c := range root.Children {
+		dep = max(dep, Solution(c))
+	}
+	return dep + 1
 }

leetcode/501-600/0559.Maximum-Depth-of-N-ary-Tree/Solution_test.go

@@ -10,12 +10,26 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs *Node
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", &Node{
+			Val: 1,
+			Children: []*Node{
+				{Val: 3, Children: []*Node{{Val: 5}, {Val: 6}}}, {Val: 2}, {Val: 4},
+			},
+		}, 3},
+		{"TestCase2", &Node{
+			Val: 1,
+			Children: []*Node{
+				{Val: 2},
+				{Val: 3, Children: []*Node{{Val: 6}, {
+					Val: 7, Children: []*Node{{Val: 11, Children: []*Node{{Val: 14}}}},
+				}}},
+				{Val: 4, Children: []*Node{{Val: 8, Children: []*Node{{Val: 12}}}}},
+				{Val: 5, Children: []*Node{{Val: 9, Children: []*Node{{Val: 13}}}, {Val: 10}}},
+			},
+		}, 5},
 	}
 
 	//	开始测试
@@ -30,10 +44,10 @@ func TestSolution(t *testing.T) {
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }