Merge pull request #1113 from 0xff-dev/1790

Add solution and test-cases for problem 1790

Author: 6boris

leetcode/1701-1800/1790.Check-if-One-String-Swap-Can-Make-Strings-Equal/README.md

@@ -1,28 +1,33 @@
 # [1790.Check if One String Swap Can Make Strings Equal][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 two strings `s1` and `s2` of equal length. A **string swap** is an operation where you choose two indices in a string (not necessarily different) and swap the characters at these indices.
+
+Return true if it is possible to make both strings equal by performing **at most one string swap** on **exactly one** of the strings. Otherwise, return `false`.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: s1 = "bank", s2 = "kanb"
+Output: true
+Explanation: For example, swap the first character with the last character of s2 to make "bank".
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Check if One String Swap Can Make Strings Equal
-```go
+```
+Input: s1 = "attack", s2 = "defend"
+Output: false
+Explanation: It is impossible to make them equal with one string swap.
 ```
 
+**Example 3:**
+
+```
+Input: s1 = "kelb", s2 = "kelb"
+Output: true
+Explanation: The two strings are already equal, so no string swap operation is required.
+```
 
 ## 结语
 

leetcode/1701-1800/1790.Check-if-One-String-Swap-Can-Make-Strings-Equal/Solution.go

@@ -1,5 +1,27 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(s1 string, s2 string) bool {
+	if s1 == s2 {
+		return true
+	}
+
+	var a, b uint8
+	diff := 0
+	for i := range s1 {
+		if s1[i] == s2[i] {
+			continue
+		}
+		diff++
+		if diff == 1 {
+			a, b = s1[i], s2[i]
+		} else if diff == 2 {
+			// a, s1, b s2
+			if !(a == s2[i] && b == s1[i]) {
+				return false
+			}
+		} else {
+			return false
+		}
+	}
+	return diff != 1
 }

leetcode/1701-1800/1790.Check-if-One-String-Swap-Can-Make-Strings-Equal/Solution_test.go

@@ -10,30 +10,30 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
+		s1, s2 string
 		expect bool
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", "bank", "kanb", true},
+		{"TestCase2", "attack", "defend", false},
+		{"TestCase3", "kelb", "kelb", true},
 	}
 
 	//	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.s1, c.s2)
 			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.s1, c.s2)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }