Add solution and test-cases for problem 3170

Author: 0xff-dev

leetcode/3101-3200/3170.Lexicographically-Minimum-String-After-Removing-Stars/README.md

@@ -1,28 +1,37 @@
 # [3170.Lexicographically Minimum String After Removing Stars][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
+You are given a string `s`. It may contain any number of `'*'` characters. Your task is to remove all `'*'` characters.
+
+While there is a `'*'`, do the following operation:
+
+- Delete the leftmost `'*'` and the **smallest** non-`'*'` character to its left. If there are several smallest characters, you can delete any of them.
+
+Return the **lexicographically smallest** resulting string after removing all `'*'` characters.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
-```
+Input: s = "aaba*"
 
-## 题意
-> ...
+Output: "aab"
 
-## 题解
+Explanation:
 
-### 思路1
-> ...
-Lexicographically Minimum String After Removing Stars
-```go
+We should delete one of the 'a' characters with '*'. If we choose s[3], s becomes the lexicographically smallest.
 ```
 
+**Example 2:**
+
+```
+Input: s = "abc"
+
+Output: "abc"
+
+Explanation:
+
+There is no '*' in the string.
+```
 
 ## 结语
 

leetcode/3101-3200/3170.Lexicographically-Minimum-String-After-Removing-Stars/Solution.go

@@ -1,5 +1,30 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(s string) string {
+	cnt := make([][]int, 26)
+	for i := range cnt {
+		cnt[i] = make([]int, 0)
+	}
+	arr := []rune(s)
+	for i, c := range arr {
+		if c != '*' {
+			cnt[c-'a'] = append(cnt[c-'a'], i)
+		} else {
+			for j := 0; j < 26; j++ {
+				if len(cnt[j]) > 0 {
+					last := len(cnt[j]) - 1
+					arr[cnt[j][last]] = '*'
+					cnt[j] = cnt[j][:last]
+					break
+				}
+			}
+		}
+	}
+	var ans []rune
+	for _, c := range arr {
+		if c != '*' {
+			ans = append(ans, c)
+		}
+	}
+	return string(ans)
 }

leetcode/3101-3200/3170.Lexicographically-Minimum-String-After-Removing-Stars/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 string
+		expect string
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", "aaba*", "aab"},
+		{"TestCase2", "abc", "abc"},
 	}
 
 	//	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() {
 }