Add solution 1600, change dir 0167、0303、0304、0307、0653、1017

leetcode/1600.Throne-Inheritance/1600. Throne Inheritance.go

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+package leetcode
+
+type ThroneInheritance struct {
+	king  string
+	edges map[string][]string
+	dead  map[string]bool
+}
+
+func Constructor(kingName string) (t ThroneInheritance) {
+	return ThroneInheritance{kingName, map[string][]string{}, map[string]bool{}}
+}
+
+func (t *ThroneInheritance) Birth(parentName, childName string) {
+	t.edges[parentName] = append(t.edges[parentName], childName)
+}
+
+func (t *ThroneInheritance) Death(name string) {
+	t.dead[name] = true
+}
+
+func (t *ThroneInheritance) GetInheritanceOrder() (res []string) {
+	var preorder func(string)
+	preorder = func(name string) {
+		if !t.dead[name] {
+			res = append(res, name)
+		}
+		for _, childName := range t.edges[name] {
+			preorder(childName)
+		}
+	}
+	preorder(t.king)
+	return
+}
+
+/**
+ * Your ThroneInheritance object will be instantiated and called as such:
+ * obj := Constructor(kingName);
+ * obj.Birth(parentName,childName);
+ * obj.Death(name);
+ * param_3 := obj.GetInheritanceOrder();
+ */

leetcode/1600.Throne-Inheritance/1600. Throne Inheritance_test.go

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+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+func Test_Problem1600(t *testing.T) {
+	obj := Constructor("king")
+	fmt.Printf("obj = %v\n", obj)
+	obj.Birth("king", "andy")
+	fmt.Printf("obj = %v\n", obj)
+	obj.Birth("king", "bob")
+	fmt.Printf("obj = %v\n", obj)
+	obj.Birth("king", "catherine")
+	fmt.Printf("obj = %v\n", obj)
+	obj.Birth("andy", "matthew")
+	fmt.Printf("obj = %v\n", obj)
+	obj.Birth("bob", "alex")
+	fmt.Printf("obj = %v\n", obj)
+	obj.Birth("bob", "asha")
+	fmt.Printf("obj = %v\n", obj)
+	param2 := obj.GetInheritanceOrder()
+	fmt.Printf("param_2 = %v obj = %v\n", param2, obj)
+	obj.Death("bob")
+	fmt.Printf("obj = %v\n", obj)
+	param2 = obj.GetInheritanceOrder()
+	fmt.Printf("param_2 = %v obj = %v\n", param2, obj)
+}

leetcode/1600.Throne-Inheritance/README.md

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+# [1600. Throne Inheritance](https://leetcode.com/problems/throne-inheritance/)
+
+
+## 题目
+
+A kingdom consists of a king, his children, his grandchildren, and so on. Every once in a while, someone in the family dies or a child is born.
+
+The kingdom has a well-defined order of inheritance that consists of the king as the first member. Let's define the recursive function `Successor(x, curOrder)`, which given a person `x` and the inheritance order so far, returns who should be the next person after `x` in the order of inheritance.
+
+```
+Successor(x, curOrder):
+    if x has no children or all of x's children are in curOrder:
+        if x is the king return null
+        else return Successor(x's parent, curOrder)
+    else return x's oldest child who's not in curOrder
+```
+
+For example, assume we have a kingdom that consists of the king, his children Alice and Bob (Alice is older than Bob), and finally Alice's son Jack.
+
+1. In the beginning, `curOrder` will be `["king"]`.
+2. Calling `Successor(king, curOrder)` will return Alice, so we append to `curOrder` to get `["king", "Alice"]`.
+3. Calling `Successor(Alice, curOrder)` will return Jack, so we append to `curOrder` to get `["king", "Alice", "Jack"]`.
+4. Calling `Successor(Jack, curOrder)` will return Bob, so we append to `curOrder` to get `["king", "Alice", "Jack", "Bob"]`.
+5. Calling `Successor(Bob, curOrder)` will return `null`. Thus the order of inheritance will be `["king", "Alice", "Jack", "Bob"]`.
+
+Using the above function, we can always obtain a unique order of inheritance.
+
+Implement the `ThroneInheritance` class:
+
+- `ThroneInheritance(string kingName)` Initializes an object of the `ThroneInheritance` class. The name of the king is given as part of the constructor.
+- `void birth(string parentName, string childName)` Indicates that `parentName` gave birth to `childName`.
+- `void death(string name)` Indicates the death of `name`. The death of the person doesn't affect the `Successor` function nor the current inheritance order. You can treat it as just marking the person as dead.
+- `string[] getInheritanceOrder()` Returns a list representing the current order of inheritance **excluding** dead people.
+
+**Example 1:**
+
+```
+Input
+["ThroneInheritance", "birth", "birth", "birth", "birth", "birth", "birth", "getInheritanceOrder", "death", "getInheritanceOrder"]
+[["king"], ["king", "andy"], ["king", "bob"], ["king", "catherine"], ["andy", "matthew"], ["bob", "alex"], ["bob", "asha"], [null], ["bob"], [null]]
+Output
+[null, null, null, null, null, null, null, ["king", "andy", "matthew", "bob", "alex", "asha", "catherine"], null, ["king", "andy", "matthew", "alex", "asha", "catherine"]]
+
+Explanation
+ThroneInheritance t= new ThroneInheritance("king"); // order:king
+t.birth("king", "andy"); // order: king >andy
+t.birth("king", "bob"); // order: king > andy >bob
+t.birth("king", "catherine"); // order: king > andy > bob >catherine
+t.birth("andy", "matthew"); // order: king > andy >matthew > bob > catherine
+t.birth("bob", "alex"); // order: king > andy > matthew > bob >alex > catherine
+t.birth("bob", "asha"); // order: king > andy > matthew > bob > alex >asha > catherine
+t.getInheritanceOrder(); // return ["king", "andy", "matthew", "bob", "alex", "asha", "catherine"]
+t.death("bob"); // order: king > andy > matthew >bob > alex > asha > catherine
+t.getInheritanceOrder(); // return ["king", "andy", "matthew", "alex", "asha", "catherine"]
+
+```
+
+**Constraints:**
+
+- `1 <= kingName.length, parentName.length, childName.length, name.length <= 15`
+- `kingName`, `parentName`, `childName`, and `name` consist of lowercase English letters only.
+- All arguments `childName` and `kingName` are **distinct**.
+- All `name` arguments of `death` will be passed to either the constructor or as `childName` to `birth` first.
+- For each call to `birth(parentName, childName)`, it is guaranteed that `parentName` is alive.
+- At most `105` calls will be made to `birth` and `death`.
+- At most `10` calls will be made to `getInheritanceOrder`.
+
+## 题目大意
+
+一个王国里住着国王、他的孩子们、他的孙子们等等。每一个时间点，这个家庭里有人出生也有人死亡。这个王国有一个明确规定的皇位继承顺序，第一继承人总是国王自己。我们定义递归函数 Successor(x, curOrder) ，给定一个人 x 和当前的继承顺序，该函数返回 x 的下一继承人。
+
+## 解题思路
+
+- 这道题思路不难。先将国王每个孩子按照顺序存在一个 map 中，然后每个国王的孩子还存在父子关系，同理也按顺序存在 map 中。执行 GetInheritanceOrder() 函数时，将国王的孩子按顺序遍历，如果每个孩子还有孩子，递归遍历到底。如果把继承关系看成一棵树，此题便是多叉树的先根遍历的问题。
+
+## 代码
+
+```go
+package leetcode
+
+type ThroneInheritance struct {
+	king  string
+	edges map[string][]string
+	dead  map[string]bool
+}
+
+func Constructor(kingName string) (t ThroneInheritance) {
+	return ThroneInheritance{kingName, map[string][]string{}, map[string]bool{}}
+}
+
+func (t *ThroneInheritance) Birth(parentName, childName string) {
+	t.edges[parentName] = append(t.edges[parentName], childName)
+}
+
+func (t *ThroneInheritance) Death(name string) {
+	t.dead[name] = true
+}
+
+func (t *ThroneInheritance) GetInheritanceOrder() (res []string) {
+	var preorder func(string)
+	preorder = func(name string) {
+		if !t.dead[name] {
+			res = append(res, name)
+		}
+		for _, childName := range t.edges[name] {
+			preorder(childName)
+		}
+	}
+	preorder(t.king)
+	return
+}
+
+/**
+ * Your ThroneInheritance object will be instantiated and called as such:
+ * obj := Constructor(kingName);
+ * obj.Birth(parentName,childName);
+ * obj.Death(name);
+ * param_3 := obj.GetInheritanceOrder();
+ */
+```