Add solution and test-cases for problem 942

Author: 0xff-dev

leetcode/901-1000/0942.DI-String-Match/README.md

@@ -1,28 +1,33 @@
 # [942.DI String Match][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
+A permutation `perm` of `n + 1` integers of all the integers in the range `[0, n]` can be represented as a string `s` of length `n` where:
+
+- `s[i] == 'I'` if `perm[i] < perm[i + 1]`, and
+- `s[i] == 'D'` if `perm[i] > perm[i + 1]`.
+
+Given a string `s`, reconstruct the permutation `perm` and return it. If there are multiple valid permutations perm, return **any of them**.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: s = "IDID"
+Output: [0,4,1,3,2]
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-DI String Match
-```go
 ```
+Input: s = "III"
+Output: [0,1,2,3]
+```
+
+**Example 3:**
 
+```
+Input: s = "DDI"
+Output: [3,2,0,1]
+```
 
 ## 结语
 

leetcode/901-1000/0942.DI-String-Match/Solution.go

@@ -1,5 +1,28 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(s string) []int {
+	res := make([]int, len(s)+1)
+	for i := range res {
+		res[i] = -1
+	}
+
+	index := 0
+	for i := 0; i < len(s); i++ {
+		if s[i] == 'D' {
+			continue
+		}
+		res[i] = index
+		index++
+		for pre := i - 1; pre >= 0 && res[pre] == -1; pre-- {
+			res[pre] = index
+			index++
+		}
+	}
+	res[len(s)] = index
+	index++
+	for pre := len(s) - 1; pre >= 0 && res[pre] == -1; pre-- {
+		res[pre] = index
+		index++
+	}
+	return res
 }

leetcode/901-1000/0942.DI-String-Match/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 []int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", "IDID", []int{0, 2, 1, 4, 3}},
+		{"TestCase2", "III", []int{0, 1, 2, 3}},
+		{"TestCase3", "DDI", []int{2, 1, 0, 3}},
 	}
 
 	//	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() {
 }