Add solution and test-cases for problem 3304

Author: 0xff-dev

leetcode/3301-3400/3304.Find-the-K-th-Character-in-String-Game-I/README.md

@@ -1,28 +1,43 @@
 # [3304.Find the K-th Character in String Game I][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
+Alice and Bob are playing a game. Initially, Alice has a string `word = "a"`.
+
+You are given a **positive** integer `k`.
+
+Now Bob will ask Alice to perform the following operation **forever**:
+
+- Generate a new string by **changing** each character in `word` to its **next** character in the English alphabet, and **append** it to the original `word`.
+
+For example, performing the operation on `"c"` generates `"cd"` and performing the operation on `"zb"` generates `"zbac"`.
+
+Return the value of the `kth` character in `word`, after enough operations have been done for `word` to have **at least** `k` characters.
+
+**Note** that the character `'z'` can be changed to `'a'` in the operation.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
-```
+Input: k = 5
+
+Output: "b"
+
+Explanation:
 
-## 题意
-> ...
+Initially, word = "a". We need to do the operation three times:
 
-## 题解
+Generated string is "b", word becomes "ab".
+Generated string is "bc", word becomes "abbc".
+Generated string is "bccd", word becomes "abbcbccd".
+```
+
+**Example 2:**
 
-### 思路1
-> ...
-Find the K-th Character in String Game I
-```go
 ```
+Input: k = 10
 
+Output: "c"
+```
 
 ## 结语
 

leetcode/3301-3400/3304.Find-the-K-th-Character-in-String-Game-I/Solution.go

@@ -1,5 +1,13 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(k int) byte {
+	str := "a"
+	for len(str) < k {
+		tmp := []byte(str)
+		for i := range tmp {
+			tmp[i] = (tmp[i]-'a'+1)%26 + 'a'
+		}
+		str += string(tmp)
+	}
+	return str[k-1]
 }

leetcode/3301-3400/3304.Find-the-K-th-Character-in-String-Game-I/Solution_test.go

@@ -10,12 +10,11 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs int
+		expect byte
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", 5, 'b'},
+		{"TestCase2", 10, 'c'},
 	}
 
 	//	开始测试
@@ -30,10 +29,10 @@ 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() {
 }