Merge pull request #1225 from 0xff-dev/1163

Add solution and test-cases for problem 1163

Author: 6boris

leetcode/1101-1200/1163.Last-Substring-in-Lexicographical-Order/README.md

@@ -1,28 +1,22 @@
 # [1163.Last Substring in Lexicographical Order][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`, return the last substring of `s` in lexicographical order.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: s = "abab"
+Output: "bab"
+Explanation: The substrings are ["a", "ab", "aba", "abab", "b", "ba", "bab"]. The lexicographically maximum substring is "bab".
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Last Substring in Lexicographical Order
-```go
 ```
-
+Input: s = "leetcode"
+Output: "tcode"
+```
 
 ## 结语
 

leetcode/1101-1200/1163.Last-Substring-in-Lexicographical-Order/Solution.go

@@ -1,5 +1,16 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(s string) string {
+	indies := [26][]int{}
+	for i, b := range s {
+		indies[b-'a'] = append(indies[b-'a'], i)
+	}
+	i := 25
+	for ; i >= 0 && len(indies[i]) == 0; i-- {
+	}
+	ans := ""
+	for _, index := range indies[i] {
+		ans = max(ans, s[index:])
+	}
+	return ans
 }

leetcode/1101-1200/1163.Last-Substring-in-Lexicographical-Order/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", "abab", "bab"},
+		{"TestCase2", "leetcode", "tcode"},
 	}
 
 	//	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() {
 }