Merge pull request #893 from 0xff-dev/2486

Add solution and test-cases for problem 2486

Author: 6boris

leetcode/2401-2500/2486.Append-Characters-to-String-to-Make-Subsequence/README.md

@@ -1,28 +1,39 @@
 # [2486.Append Characters to String to Make Subsequence][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 `s` and `t` consisting of only lowercase English letters.
+
+Return the minimum number of characters that need to be appended to the end of `s` so that `t` becomes a **subsequence** of `s`.
+
+A **subsequence** is a string that can be derived from another string by deleting some or no characters without changing the order of the remaining characters.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: s = "coaching", t = "coding"
+Output: 4
+Explanation: Append the characters "ding" to the end of s so that s = "coachingding".
+Now, t is a subsequence of s ("coachingding").
+It can be shown that appending any 3 characters to the end of s will never make t a subsequence.
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Append Characters to String to Make Subsequence
-```go
 ```
+Input: s = "abcde", t = "a"
+Output: 0
+Explanation: t is already a subsequence of s ("abcde").
+```
+
+**Example 3:**
 
+```
+Input: s = "z", t = "abcde"
+Output: 5
+Explanation: Append the characters "abcde" to the end of s so that s = "zabcde".
+Now, t is a subsequence of s ("zabcde").
+It can be shown that appending any 4 characters to the end of s will never make t a subsequence.
+```
 
 ## 结语
 

leetcode/2401-2500/2486.Append-Characters-to-String-to-Make-Subsequence/Solution.go

@@ -1,5 +1,16 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(s string, t string) int {
+	match := 0
+	i, j := 0, 0
+	for i < len(s) && j < len(t) {
+		if s[i] == t[j] {
+			match++
+			i++
+			j++
+			continue
+		}
+		i++
+	}
+	return len(t) - match
 }

leetcode/2401-2500/2486.Append-Characters-to-String-to-Make-Subsequence/Solution_test.go

@@ -10,30 +10,30 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		ss, tt string
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", "coaching", "coding", 4},
+		{"TestCase2", "abcde", "a", 0},
+		{"TestCase3", "z", "abcde", 5},
 	}
 
 	//	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.ss, c.tt)
 			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.ss, c.tt)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }