Add solution and test-cases for problem 1797

Author: 0xff-dev

leetcode/1701-1800/1797.Design-Authentication-Manager/1.png

@@ -1,28 +1,38 @@
 # [1797.Design Authentication Manager][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
+There is an authentication system that works with authentication tokens. For each session, the user will receive a new authentication token that will expire `timeToLive` seconds after the `currentTime`. If the token is renewed, the expiry time will be **extended** to expire `timeToLive` seconds after the (potentially different) `currentTime`.
 
-**Example 1:**
+Implement the `AuthenticationManager` class:
 
-```
-Input: a = "11", b = "1"
-Output: "100"
-```
+- `AuthenticationManager(int timeToLive)` constructs the `AuthenticationManager` and sets the `timeToLive`.
+- `generate(string tokenId, int currentTime)` generates a new token with the given `tokenId` at the given `currentTime` in seconds.
+- `renew(string tokenId, int currentTime)` renews the **unexpired** token with the given `tokenId` at the given `currentTime` in seconds. If there are no unexpired tokens with the given `tokenId`, the request is ignored, and nothing happens.
+- `countUnexpiredTokens(int currentTime)` returns the number of **unexpired** tokens at the given currentTime.
 
-## 题意
-> ...
+Note that if a token expires at time `t`, and another action happens on time t (`renew` or `countUnexpiredTokens`), the expiration takes place **before** the other actions.
 
-## 题解
+**Example 1:**  
 
-### 思路1
-> ...
-Design Authentication Manager
-```go
-```
+![1](./1.png)
 
+```
+Input
+["AuthenticationManager", "renew", "generate", "countUnexpiredTokens", "generate", "renew", "renew", "countUnexpiredTokens"]
+[[5], ["aaa", 1], ["aaa", 2], [6], ["bbb", 7], ["aaa", 8], ["bbb", 10], [15]]
+Output
+[null, null, null, 1, null, null, null, 0]
+
+Explanation
+AuthenticationManager authenticationManager = new AuthenticationManager(5); // Constructs the AuthenticationManager with timeToLive = 5 seconds.
+authenticationManager.renew("aaa", 1); // No token exists with tokenId "aaa" at time 1, so nothing happens.
+authenticationManager.generate("aaa", 2); // Generates a new token with tokenId "aaa" at time 2.
+authenticationManager.countUnexpiredTokens(6); // The token with tokenId "aaa" is the only unexpired one at time 6, so return 1.
+authenticationManager.generate("bbb", 7); // Generates a new token with tokenId "bbb" at time 7.
+authenticationManager.renew("aaa", 8); // The token with tokenId "aaa" expired at time 7, and 8 >= 7, so at time 8 the renew request is ignored, and nothing happens.
+authenticationManager.renew("bbb", 10); // The token with tokenId "bbb" is unexpired at time 10, so the renew request is fulfilled and now the token will expire at time 15.
+authenticationManager.countUnexpiredTokens(15); // The token with tokenId "bbb" expires at time 15, and the token with tokenId "aaa" expired at time 7, so currently no token is unexpired, so return 0.
+```
 
 ## 结语
 

leetcode/1701-1800/1797.Design-Authentication-Manager/README.md

@@ -1,5 +1,59 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+type AuthenticationManager struct {
+	live  int64
+	token map[string]int64
+}
+
+func Constructor(timeToLive int) AuthenticationManager {
+	return AuthenticationManager{live: int64(timeToLive), token: make(map[string]int64)}
+}
+
+func (this *AuthenticationManager) Generate(tokenId string, currentTime int) {
+	this.token[tokenId] = int64(currentTime) + this.live
+}
+
+func (this *AuthenticationManager) Renew(tokenId string, currentTime int) {
+	expired, ok := this.token[tokenId]
+	if !ok {
+		return
+	}
+	ic := int64(currentTime)
+	if expired > ic {
+		this.token[tokenId] = ic + this.live
+	}
+}
+
+func (this *AuthenticationManager) CountUnexpiredTokens(currentTime int) int {
+	ans := 0
+	ic := int64(currentTime)
+	for _, c := range this.token {
+		if c > ic {
+			ans++
+		}
+	}
+	return ans
+}
+
+type input struct {
+	op    byte
+	token string
+	v     int
+}
+
+func Solution(n int, inputs []input) []int {
+	c := Constructor(n)
+	ans := make([]int, 0)
+	for _, op := range inputs {
+		if op.op == 'g' {
+			c.Generate(op.token, op.v)
+			continue
+		}
+		if op.op == 'r' {
+			c.Renew(op.token, op.v)
+			continue
+		}
+		ans = append(ans, c.CountUnexpiredTokens(op.v))
+	}
+	return ans
 }

leetcode/1701-1800/1797.Design-Authentication-Manager/Solution.go

@@ -10,30 +10,37 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		n      int
+		inputs []input
+		expect []int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", 5, []input{
+			{'r', "aaa", 1},
+			{'g', "aaa", 2},
+			{'c', "", 6},
+			{'g', "bbb", 7},
+			{'r', "aaa", 8},
+			{'r', "bbb", 10},
+			{'c', "", 15},
+		}, []int{1, 0}},
 	}
 
 	//	开始测试
 	for i, c := range cases {
 		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
-			got := Solution(c.inputs)
+			got := Solution(c.n, c.inputs)
 			if !reflect.DeepEqual(got, c.expect) {
-				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
-					c.expect, got, c.inputs)
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v %v",
+					c.expect, got, c.n, c.inputs)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }