Merge pull request #1135 from 0xff-dev/917

Add solution and test-cases for problem 917

Author: 6boris

leetcode/901-1000/0917.Reverse-Only-Letters/README.md

@@ -1,28 +1,33 @@
 # [917.Reverse Only Letters][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 string `s`, reverse the string according to the following rules:
+
+- All the characters that are not English letters remain in the same position.
+- All the English letters (lowercase or uppercase) should be reversed.
+
+Return `s` after reversing it.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: s = "ab-cd"
+Output: "dc-ba"
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Reverse Only Letters
-```go
 ```
+Input: s = "a-bC-dEf-ghIj"
+Output: "j-Ih-gfE-dCba"
+```
+
+**Example 3:**
 
+```
+Input: s = "Test1ng-Leet=code-Q!"
+Output: "Qedo1ct-eeLg=ntse-T!"
+```
 
 ## 结语
 

leetcode/901-1000/0917.Reverse-Only-Letters/Solution.go

@@ -1,5 +1,20 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func ok(b byte) bool {
+	return (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z')
+}
+
+func Solution(s string) string {
+	bs := []byte(s)
+	l, r := 0, len(bs)-1
+	for l < r {
+		for ; l < r && !ok(bs[l]); l++ {
+
+		}
+		for ; r > l && !ok(bs[r]); r-- {
+		}
+		bs[l], bs[r] = bs[r], bs[l]
+		l, r = l+1, r-1
+	}
+	return string(bs)
 }

leetcode/901-1000/0917.Reverse-Only-Letters/Solution_test.go

@@ -10,12 +10,12 @@ 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", "ab-cd", "dc-ba"},
+		{"TestCase2", "a-bC-dEf-ghIj", "j-Ih-gfE-dCba"},
+		{"TestCase3", "Test1ng-Leet=code-Q!", "Qedo1ct-eeLg=ntse-T!"},
 	}
 
 	//	开始测试
@@ -30,10 +30,10 @@ 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() {
 }